Chandra X-Ray Observatory
	(CXC)

Accepted Cycle 14 Observing Proposals

SN, SNR & ISOLATED NS

Proposal NumberSubject CategoryPI NameTitle
14500134SN, SNR AND ISOLATED NSWeisskopfJoint Chandra and HST Monitoring and Studies of the Crab Nebula
14500137SN, SNR AND ISOLATED NSSakamotoIdentification of the Host Galaxy of Swift Short GRBs by the Chandra Sub-arcsecond Position
14500144SN, SNR AND ISOLATED NSWeisskopfPre-planned Target of Opportunity Observations of the Crab Nebula upon the Occurrence of a Gamma-Ray Flare
14500153SN, SNR AND ISOLATED NSRomaniA Legacy Study of the Relativistic Shocks of PWNe
14500166SN, SNR AND ISOLATED NSBurrowsChandra Cycle 14 Spatial and Spectral Monitoring of SN 1987A
14500203SN, SNR AND ISOLATED NSDurantRevealing pulsars hidden in the 2nd Fermi Catalogue
14500204SN, SNR AND ISOLATED NSReaPROMPT STUDY OF MAGNETAR OUTBURSTS WITH CHANDRA
14500207SN, SNR AND ISOLATED NSMarguttiLate-time X-rays to extract the true energy of nearby GRBs
14500218SN, SNR AND ISOLATED NSSoderbergThe Energetics and Environments of Type Ibc Supernovae
14500229SN, SNR AND ISOLATED NSPooleyInvestigating the Emission of Extraordinarily Luminous and Unusual Supernovae
14500230SN, SNR AND ISOLATED NSHalpernContinuing the Ephemeris of the CCO Pulsar in Puppis A
14500234SN, SNR AND ISOLATED NSPooleyChandra Observations of New X-ray Supernovae
14500235SN, SNR AND ISOLATED NSTiengoMeasuring magnetar distance from the dust echo of a bright burst
14500256SN, SNR AND ISOLATED NSNgEnigmatic X-ray Emission from a High Magnetic Field Pulsar
14500298SN, SNR AND ISOLATED NSGotthelfIs the CCO associated with SNR G350.1-0.3 an anti-magnetar?
14500333SN, SNR AND ISOLATED NSBurrowsSearch for Jet Breaks in Long GRB X-ray Afterglows
14500414SN, SNR AND ISOLATED NSPatnaudeMulticycle Monitoring of the Young Galactic Supernova Remnant Cassiopeia A
14500427SN, SNR AND ISOLATED NSNgMagnetars in Quiescence: a Key to Test the 'Grand Unification' of Neutron Stars
14500467SN, SNR AND ISOLATED NSMillerChandra Imaging of a New, Young, Stratified SNR
14500474SN, SNR AND ISOLATED NSSaz ParkinsonSearch for X-ray counterparts of potential radio-quiet gamma-ray MSPs in Fermi LAT sources, using Chandra
14500575SN, SNR AND ISOLATED NSRacusinConstraining the Energetics of Fermi-LAT GRBs with Chandra
14500633SN, SNR AND ISOLATED NSKaspiMeasuring Cooling Curves Following Magnetar Outbursts
14500654SN, SNR AND ISOLATED NSPavlovHESS J1809-193 and PSR J1809-1917: TeV - X-ray Connection
14500689SN, SNR AND ISOLATED NSKargaltsevCheshire cat's grin
14500702SN, SNR AND ISOLATED NSSlaneA Detailed Study of the Composite Supernova Remnant MSH 11-62
14500704SN, SNR AND ISOLATED NSMarelliSearching for X-ray counterparts of radio-quiet Fermi pulsars
14500725SN, SNR AND ISOLATED NSReynoldsG11.2-0.3: Core-Collapse Supernova Progenitors, Cosmic Rays, and Pulsar-Wind Nebulae
14500751SN, SNR AND ISOLATED NSKaspiTarget-of-Opportunity Chandra Observations of Glitching High-B Radio Pulsars: Searching for Magnetar Metamorphoses
14500839SN, SNR AND ISOLATED NSReaAn asymmetric X-ray nebula around the magnetar SGR1806-20?
14500851SN, SNR AND ISOLATED NSFruchterThe Astrophysics of the Most Energetic Gamma-Ray Bursts
14500852SN, SNR AND ISOLATED NSSaz ParkinsonChandra observations of 4 Fermi-LAT-detected Supernova Remnants with pulsar-like gamma-ray emission
14500895SN, SNR AND ISOLATED NSCastroStudying Particle Acceleration and Ejecta in Northwest Rim of the Supernova Remnant RCW 86 with Chandra
14500898SN, SNR AND ISOLATED NSAliuIdentifying the TeV gamma-ray source MGRO J2228+61, FINALLY!
14500928SN, SNR AND ISOLATED NSKargaltsevA comparative study of two outstanding pulsar tails
14500933SN, SNR AND ISOLATED NSFoxX-Ray Signatures of Late-Time Circumstellar Interaction in Type IIn Supernovae

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 14500134

Title: Joint Chandra and HST Monitoring and Studies of the Crab Nebula

PI Name: Martin Weisskopf

In 2010 Sep the Crab surprised the astrophysical community with a powerful gamma-ray flare, detected by the Agile and Fermi satellites. In 2011 it also became apparant that the nebula has been exhibiting up to 7% variability in hard X-rays for over a decade. The scientific purpose of this proposal is to: 1) To (continue to) identify, quantify, and correlate the spatial and spectral variations in X-rays and the optical over time 2) Establish both an X-ray and optical baseline of the system prior to any future gamma-ray flare as an aid for establishing the location of the flare.

R.A. Dec. Target Name Det. Grating Exp.Time
05:34:31.60+22:00:56.40CrabACIS-SNONE25

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 14500137

Title: Identification of the Host Galaxy of Swift Short GRBs by the Chandra Sub-arcsecond Position

PI Name: Takanori Sakamoto

We propose a continuation of our successful ToO program to observe short GRBs detected by Swift to identify the afterglow in X-rays by a sub-arcsecond position from Chandra. Our ToO program will increase the number of short GRBs having an unambiguous host galaxy identification, and also should provide a much less biased sample host galaxies of short GRBs. We request a maximum of 6 ToOs for 20 ksec each based on the estimation of previous Swift short GRB observations. Our trigger criteria are 1) Swift short GRBs localized by Swift/XRT and 2) no afterglow confirmation in optical within 5 hours after the burst. We request <1-3 days response to our ToO, so that the afterglow can be observed while still bright.

R.A. Dec. Target Name Det. Grating Exp.Time
Short GRB ToOACIS-SNONE20

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 14500144

Title: Pre-planned Target of Opportunity Observations of the Crab Nebula upon the Occurrence of a Gamma-Ray Flare

PI Name: Martin Weisskopf

The stunning discovery of rapidly variable ~1 GeV flux demonstrates that the nebula structure differs from the description found in the majority of recent theoretical models. Our main scientific goal is to locate the origin of this emission. We have a twofold approach to this. First, in another proposal we have been monitoring and characterizing the variability in the nebula flux using ACIS (and HST). Here we propose one additional ACIS ToO near the time of the next flare to search for any unusual changes in the nebula. Due to pileup we are unable to probe very close to the pulsar. Thus our second prong is to obtain three HRC observations as part of the same ToO. This will allow searching for changes within 1 arcsec of the pulsar.

R.A. Dec. Target Name Det. Grating Exp.Time
05:34:31.60+22:00:56.40CrabHRC-SLETG70

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 14500153

Title: A Legacy Study of the Relativistic Shocks of PWNe

PI Name: Roger Romani

We propose deep ACIS observations of five pulsar wind nebulae (PWNe) with kyr-Myr ages. These carefully chosen targets show a high degree of axial symmetry in existing short ACIS images, so that the proposed imaging/spectroscopic studies can probe the geometry of the termination shock and the nature of the post-shock flow. Partitioning the exposure, we will also constrain instability growth and flow speed. By extending our view of PWN dynamics and evolution beyond the spectacular Crab and Vela nebulae, this legacy data set probes the mechanisms converting rotational energy to relativistic jet/torus outflow, key to astrophysical sources on many scales. Multiwavelength studies and modeling will also reveal parameters of the underlying pulsar accelerator and the wind-environment interaction.

R.A. Dec. Target Name Det. Grating Exp.Time
03:58:53.70+54:13:13.70PSR J0358+5413ACIS-INONE400
06:33:54.20+17:46:12.90PSR J0633+1746ACIS-INONE600
17:41:57.30-20:54:11.80PSR J1741-2054ACIS-SNONE300

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 14500166

Title: Chandra Cycle 14 Spatial and Spectral Monitoring of SN 1987A

PI Name: David Burrows

Regular monitoring of SN 1987A, the only supernova remnant in which we can study the early developmental stages in detail, is critical to testing models of SNR evolution, nonequilibrium ionization processes, and thin plasma spectra. SN 1987A presents a unique opportunity to observe the birth and early evolution of a supernova remnant at high spatial and spectral resolution for the first time. We propose to continue our program of monitoring SNR1987A at roughly six month intervals in Cycle 14.

R.A. Dec. Target Name Det. Grating Exp.Time
05:35:28.00-69:16:11.10SN 1987AACIS-SHETG75
05:35:28.00-69:16:11.10SN 1987AACIS-SHETG75

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 14500203

Title: Revealing pulsars hidden in the 2nd Fermi Catalogue

PI Name: Martin Durant

We propose a mini-survey of unclassified Fermi sources from the 2FGL catalogue. Using an intelligent parameter selection, we have identified a sub-sample that is likely to be dominated by pulsars. We aim to identify 8 new gamma-ray pulsars and their X-ray counterparts, and thus significantly increase the population of pulsars detected in both gamma- and X-rays. The existing limited data hint at an intriguing change in the slope of the L(Edot) dependence at Edot~1e35-36 erg/s, both in X-rays and gamma-rays. By identifying more pulsars in both gamma- and X-rays, especially at lower Edot, we will be able to confirm and study such breaks and relationships. We will also find new X-ray bright pulsars suitable for detailed study.

R.A. Dec. Target Name Det. Grating Exp.Time
20:18:02.60+36:26:54.002FGL J2018.0+3626ACIS-INONE10
10:27:27.40-57:30:40.002FGL J1027.4-5730cACIS-INONE10

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 14500204

Title: PROMPT STUDY OF MAGNETAR OUTBURSTS WITH CHANDRA

PI Name: Nanda Rea

The discovery of transient magnetars has opened a new perspective in the field confirming that a relatively large number of members of this class has not been discovered yet, and suggesting that others would manifest themselves in the future through outbursts. This proposal is aimed at gathering new insights on the physics of magnetars through the study of their outbursts. In particular, we are asking for 85ks of Chandra time divided in 4 observations throughout the outburst from a known or still unknown magnetar candidate.

R.A. Dec. Target Name Det. Grating Exp.Time
18:09:51.10-19:43:51.70XTE J1810-197ACIS-SNONE85
01:00:43.10-72:11:34.00CXOUJ0110-7211ACIS-SNONE85
01:46:22.40+61:45:03.304U0142+614ACIS-SNONE85
10:50:07.10-59:53:21.401E1048.1-5937ACIS-SNONE85
17:08:46.00-40:08:53.00RXSJ170849-400910ACIS-SNONE85
18:44:54.70-02:56:53.40AXJ1844-0256ACIS-SNONE85
20:13:52.80+34:19:55.20SGR 2013+34ACIS-SNONE85
23:01:08.30+58:52:44.501E 2259+584ACIS-SNONE85
19:07:14.30+09:19:20.10SGR 1900+14ACIS-SNONE85
18:08:39.30-20:24:39.50SGR 1806-20ACIS-SNONE85
05:26:00.90-66:04:36.30SGR 0526-66ACIS-SNONE85
05:01:06.20+45:16:35.00SGR 0501+4516ACIS-SNONE85
15:50:55.30-54:19:02.001E 1547.0-5408ACIS-SNONE85
04:18:33.90+57:32:22.90SGR 0418+4729ACIS-SNONE85
18:33:44.40-08:31:07.70SGR 1833-0832ACIS-SNONE85
16:22:44.80-49:50:54.40PSR 1622-4950ACIS-SNONE85
17:14:05.70-38:10:30.90CXO 171405-381031ACIS-SNONE85
18:34:52.10-08:45:56.00Swift 1834-0836ACIS-SNONE85
16:47:10.20-45:52:17.00CXO J164710.2-455216ACIS-SNONE85
NEWMAGNETARACIS-SNONE85
18:41:19.40-04:56:10.901E1841-04ACIS-SNONE85
16:35:51.80-47:35:23.30SGR 1627-41ACIS-SNONE85
18:46:24.50-02:58:28.00PSR J1846-0258ACIS-SNONE85

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 14500207

Title: Late-time X-rays to extract the true energy of nearby GRBs

PI Name: Raffaella Margutti

We propose an in-depth study of a nearby long gamma-ray burst (GRB, z<0.3) with Chandra. Our synergistic multi-wavelength effort (radio, optical, Swift/XRT and proposed CXO) is designed to extract the true energy of these explosions, therefore allowing us to: (i) investigate whether sub-energetic GRBs share the same explosion mechanisms as typical GRBs; (ii) investigate what essential physical property enables only a small fraction of supernovae to harbor a relativistic GRB outflow; (iii) understand if "jet-driven" explosions are common in all supernovae. These objectives are only possible by expanding the current small sample of nearby GRBs and drawing comparisons of the X-ray afterglow properties within the GRB sample and with ordinary SNe

R.A. Dec. Target Name Det. Grating Exp.Time
GRBSNACIS-SNONE50

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 14500218

Title: The Energetics and Environments of Type Ibc Supernovae

PI Name: Alicia Soderberg

Twenty-five years have passed since the peculiar class of Type Ibc supernovae were first recognized as a distinct flavor of core-collapse explosions. However, it is only recently that SNe Ibc have enjoyed a surge of interest thanks to their association with GRBs. Today, the most crucial question is whether SNe Ibc and GRBs arise from similar or distinct progenitor systems. Progress requires a detailed study of ordinary SNe Ibc which out-number GRBs by a factor of 100. Here we propose to continue our successful Chandra ToO program for SNe Ibc that is complemented by Swift/XRT and EVLA observations from our on-going programs.

R.A. Dec. Target Name Det. Grating Exp.Time
SN IbcACIS-SNONE10
SN Ibc 2ACIS-SNONE10

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 14500229

Title: Investigating the Emission of Extraordinarily Luminous and Unusual Supernovae

PI Name: David Pooley

In the past few years, the Texas Supernova (SN) Search and its successor the ROTSE SN Verification Project (RSVP) have found several of the most luminous SNe ever detected. Explaining such high luminosities has been challenging, and, in each case, one must consider the "standard" interaction of the SN ejecta with the surrounding material as a (partial) source of this extraordinary luminosity before considering more exotic scenarios (e.g., pair-formation instability). Deep Chandra observations are sensitive probes of interaction and are the only way to detect or set meaningful limits on the X-ray flux from such a SN given the typical distances involved. The continuation of RSVP as well as the new Palomar Transient Factory ensure a reliable stream of sources for future discovery.

R.A. Dec. Target Name Det. Grating Exp.Time
Luminous SNACIS-SNONE100

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 14500230

Title: Continuing the Ephemeris of the CCO Pulsar in Puppis A

PI Name: Jules Halpern

We have measured the apparent spin-down of the pulsar in Puppis A, which indicates a dipole magnetic field of only 3.e10 G. This confirms the anti-magnetar scenario for CCOs. The P-dot is so small that it is comparable to the purely kinematic value expected from the Shklovsky (train whistle) effect. The intrinsic P-dot must be smaller, possibly even negative (spinning up). There is evidence for variability of a 0.8 keV emission line that is seen in the spectrum. These effects suggest that there may be some accretion from a fall-back disk, requiring an even weaker surface magnetic field. One more Chandra observation is needed to bridge to future XMM cycles that will extend the ephemeris, to test further for torque noise and associated spectral variability.

R.A. Dec. Target Name Det. Grating Exp.Time
08:21:57.30-43:00:17.40PSR J0821-4300ACIS-SNONE33

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 14500234

Title: Chandra Observations of New X-ray Supernovae

PI Name: David Pooley

We propose to continue our X-ray studies of all types of supernovae (SNe). The Swift satellite has ushered in a new era of studying SNe in the X-rays, obtaining densely sampled observations for nearby SNe, both core collapse and thermonuclear (although no Type Ia has been conclusively detected in X-rays). However, the Swift XRT spatial resolution is often not good enough to definitively associate X-ray emission in the direction of the SN with the SN itself. We propose short Chandra observations to alleviate this. These observations will assess the X-ray environment of newly discovered X-ray SNe to determine any possible source confusion or contamination of the SN flux. Our strategy makes the best use of the capabilities of each observatory.

R.A. Dec. Target Name Det. Grating Exp.Time
SN1ACIS-SNONE10
SN2ACIS-SNONE10
SN4ACIS-SNONE10
SN3ACIS-SNONE10

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 14500235

Title: Measuring magnetar distance from the dust echo of a bright burst

PI Name: Andrea Tiengo

In 2009 we discovered, around the magnetar 1E 1547.0-5408, three bright X-ray expanding rings due to scattering of the radiation of a strong burst by three dust layers in our Galaxy. We propose rapid follow-up observations with Chandra in the case that a similar phenomenon is again detected in a magnetar. This would provide the first high resolution two-dimensional images of an X-ray expanding ring around an astrophysical object and constrain the source distance and energetics of the emission producing the dust echo. Moreover, the time evolution of the ring intensity and spectrum, depending on the dust grains composition and size, is a powerful tool to test the different interstellar dust models. This proposal was accepted in Cycle 12 and 13 but it has not been triggered yet.

R.A. Dec. Target Name Det. Grating Exp.Time
Magnetar scattering haloACIS-INONE70

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 14500256

Title: Enigmatic X-ray Emission from a High Magnetic Field Pulsar

PI Name: Chi-Yung Ng

We have obtained a concrete detection of off-pulse X-ray emission from the high magnetic field pulsar B1509-58 using archival Chandra HRC data. We proposed a new ACIS study to identify the nature of this emission, which will provide the best constraint on the stellar surface temperature, allowing a direct test of the magneto-thermal evolution of neutron stars under a strong B-field. The proposed observation will also help identify the emission zone of the non-thermal radiation, offering a key to understanding the pulsar's highly unusual gamma-ray properties.

R.A. Dec. Target Name Det. Grating Exp.Time
15:13:55.60-59:08:08.90PSR B1509-58ACIS-SNONE60

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 14500298

Title: Is the CCO associated with SNR G350.1-0.3 an anti-magnetar?

PI Name: Eric Gotthelf

There is compelling evidence that the recently discovered X-ray source in the unusual supernova remnant SNR G350.1-0.3 is an anti-magnetar, a young pulsar born with a weak magnetic field. Its spectrum, location, and lack of multi-wavelength identification are consistent with a central compact object (CCO) associated with the highly asymmetric remnant. We propose a Chandra CC-mode observation to search for the expected pulsations. If a weakly magnetized neutron star like the other CCO pulsars, it will help define the range of parameters of an important new class of young neutron stars.

R.A. Dec. Target Name Det. Grating Exp.Time
17:20:54.60-37:26:52.50XMMU J172054.5-372652ACIS-SNONE89.5

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 14500333

Title: Search for Jet Breaks in Long GRB X-ray Afterglows

PI Name: David Burrows

In the standard fireball model for GRB afterglows, the jet opening angle can be determined from the achromatic jet break time by measuring the time at which this break in the light curve occurs. Swift XRT observations have shown that jet breaks are not observed in the first several days or weeks of a typical X-ray afterglow. This has important implications for the derived energetics of the GRB itself that cannot be resolved without a more complete sample of observed jet breaks. We propose to follow up to 4 carefully chosen long GRB afterglows with late-time Chandra observations in order to search for jet breaks occurring after the Swift observations end.

R.A. Dec. Target Name Det. Grating Exp.Time
GRB AO14-01ACIS-SNONE60
GRB AO14-02ACIS-SNONE60
GRB AO14-03ACIS-SNONE60
GRB AO14-04ACIS-SNONE60

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 14500414

Title: Multicycle Monitoring of the Young Galactic Supernova Remnant Cassiopeia A

PI Name: Daniel Patnaude

Cas A is one of only a handful of young supernova remnants to exhibit time variations in thermal and nonthermal emission, and is the only remnant to show direct evidence for an evolving, young central neutron star. Here we propose for three 50 ksec observations of Cas A spaced by approximately one year, which are designed to (1): probe the structure and composition of supernova ejecta by following its evolution as it is heated by the reverse shock, (2): test theories of particle acceleration at supernova shocks, and (3): monitor the surface temperature evolution of the neutron star to test theories of nuclear and condensed matter physics, and in particular superfluidity and superconductivity.

R.A. Dec. Target Name Det. Grating Exp.Time
23:23:26.70+58:49:03.00Cassiopeia AACIS-SNONE150

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 14500427

Title: Magnetars in Quiescence: a Key to Test the 'Grand Unification' of Neutron Stars

PI Name: Chi-Yung Ng

It has been proposed that magnetars and rotation-powered pulsars are drawn from the same class of neutron star, with the difference lying in their B-field strengths, particularly the toroidal or higher order multipole components, which are not measurable through spin-down. This suggests a higher surface temperature for quiescent magnetars compared to rotation-powered pulsars of a similar age. To test this hypothesis, we propose Chandra observations of two recently discovered magnetars to measure their X-ray spectra in quiescence. This will expand the sample of quiescent magnetar spectra to allow a quantitative comparison with the magnetothermal evolution picture of neutron stars.

R.A. Dec. Target Name Det. Grating Exp.Time
05:01:08.00+45:16:31.00SGR 0501+4516ACIS-SNONE30

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 14500467

Title: Chandra Imaging of a New, Young, Stratified SNR

PI Name: Jon Miller

We request a 50 ksec observation of the newly discovered supernova remnant Swift J132150.9-633350 (G306.3-0.9). The remnant was discovered in a Swift survey of the Galactic Plane, and followed-up with a 5 ksec Chandra snapshot observation. The remnant is likely one of the 10-20 yountest known in the Milky Way, and is plausibly among the youngest few. There is strong evidence of significant elemental stratification within the remnant, abundance enhancements in several elements, and a few plausible candidates for compact objects. The 50 ksec observation we propose to make will better reveal the nature of the nature of this remnant, the explosion, and progenitor star, and enable a deep search for a compact object.

R.A. Dec. Target Name Det. Grating Exp.Time
13:21:50.90-63:33:50.00Swift J132150.9-633350ACIS-SNONE50

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 14500474

Title: Search for X-ray counterparts of potential radio-quiet gamma-ray MSPs in Fermi LAT sources, using Chandra

PI Name: Pablo Saz Parkinson

The Large Area Telescope (LAT) on Fermi has detected over 100 gamma-ray pulsars in the last three years, revolutionizing our understanding of these objects and their high-energy emission. One crucial open question concerns the existence of radio-quiet gamma-ray MSPs. The answer has profound implications for our understanding of the geometry and emission mechanisms of pulsars. Blind searches for gamma-ray MSPs are hampered by the large uncertainties in LAT positions. We propose to use Chandra to obtain precise positions of potential X-ray counterparts of bright LAT sources considered plausible radio-quiet MSP. This will enable the most sensitive MSP blind searches in LAT data to date. We will determine the X-ray position, flux, and spectral properties of all X-ray sources detected.

R.A. Dec. Target Name Det. Grating Exp.Time
09:34:02.10-62:31:34.702FGL J0934.0-6231ACIS-SNONE45
02:12:09.50+53:18:19.102FGL J0212.1+5318ACIS-SNONE30

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 14500575

Title: Constraining the Energetics of Fermi-LAT GRBs with Chandra

PI Name: Judith Racusin

We propose to observe late-time X-ray afterglows of the most energetic subset of Fermi-LAT detected GRBs in order to constrain their jet break times, opening angles, and collimation corrected energy outputs. This new and exceptional population of GRBs demonstrate several new features not previously observed, and appear to be brighter on average than Swift-era optical and X-ray afterglows, which makes them excellent candidates for broadband observations and detailed modeling. Observations of the X-ray afterglows by Swift-XRT usually do not reveal jet break signatures in these objects, suggesting that they occur later when the afterglows are too faint for XRT, but possibly still observable by Chandra.

R.A. Dec. Target Name Det. Grating Exp.Time
GRB AO14-1ACIS-SNONE60
GRB AO14-2ACIS-SNONE60

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 14500633

Title: Measuring Cooling Curves Following Magnetar Outbursts

PI Name: Victoria Kaspi

Magnetars have been observed to increase their flux output by several orders of magnitude in outbursts. Following outbursts they cool on timescales of months to years. We propose to observe two magnetars, Swift J1822.3-1606 and 1E 1547.0-5408, using Chandra as they approach their quiescent state following their recent outbursts in 2011 and 2009, respectively. We will apply a newly developed crustal cooling model to these cooling curves to constrain the properties of the magnetars, such as the crust thickness and heat capacity, and of their outbursts, such as the location of energy deposition.

R.A. Dec. Target Name Det. Grating Exp.Time
18:22:18.00-16:04:26.80Swift J1822.3-1606ACIS-SNONE35

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 14500654

Title: HESS J1809-193 and PSR J1809-1917: TeV - X-ray Connection

PI Name: George Pavlov

We propose a detailed study of the pulsar wind nebula (PWN) that apparently connects the young pulsar J1809-1917 with the extended TeV source HESS J1809-193. The asymmetric PWN, extended toward the center of the offset TeV source, was detected in a previous Chandra observation, too short to firmly establish the connection and study the PWN properties. The proposed observation will enable us to map the PWN brightness distribution and measure the spectra in the regions where the X-ray and TeV sources overlap. In particular, it will test the hypothesis that many extended TeV sources are relic plerions crushed by asymmetric SNR reverse shocks. The results will clarify the SNR/pulsar/PWN evolution and elucidate the physics of pulsar winds and relativistic shocks.

R.A. Dec. Target Name Det. Grating Exp.Time
18:09:44.20-19:20:07.60HESS J1809-193ACIS-INONE120

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 14500689

Title: Cheshire cat's grin

PI Name: Oleg Kargaltsev

As the 100-kyr-old PSR J1906+0746 in a double NS binary candidate is rather young and energetic, one would expect a detectable X-ray emission from the pulsar and pulsar-wind nebula (PWN) with comparable luminosities in both components. However, our observation with Chandra did not detect the pulsar or a compact PWN, but it instead revealed a puzzling elliptical structure centered on the radio pulsar position. It might be a PWN, but the unusually high PWN-to-pulsar flux ratio and the large size of the extended emission are at odds with our current understanding of X-ray emission from PWNe, which suggests that we might be missing the complete picture. A follow-up observation of this unique system will clarify the picture and solve the riddle of the "Cheshire cat's grin".

R.A. Dec. Target Name Det. Grating Exp.Time
19:06:49.00+07:46:37.00J1906+0746ACIS-INONE57

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 14500702

Title: A Detailed Study of the Composite Supernova Remnant MSH 11-62

PI Name: Patrick Slane

MSH 11-62 is a remarkable example of an evolved core-collapse supernova remnant. It appears to be evolving in a wind-blown cavity created by its massive progenitor, shows evidence for energetic particles accelerated by the SNR shock and for ejecta heated by the reverse shock, and is accompanied by a neutron star powering a bright pulsar wind nebula that is apparently being disrupted by the supernova remnant reverse shock. We propose a deep Chandra observation to turn our qualitative picture of this remnant into a quantitative investigation of its ambient medium, ejecta profile, and pulsar wind nebula structure. We will use these measurements to model the evolution of the system, constrain the properties of its progenitor, and address the nature of its gamma-ray emission.

R.A. Dec. Target Name Det. Grating Exp.Time
11:11:48.00-60:37:60.00MSH 11-62ACIS-INONE375

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 14500704

Title: Searching for X-ray counterparts of radio-quiet Fermi pulsars

PI Name: Martino Marelli

The Large Area Telescope (LAT) on-board the Fermi mission is opening a new window on pulsar astrophysics, by unveiling more than 100 new gamma-ray pulsars, a third of which lacks detection at radio wavelengths despite very deep searches. For these pulsars, X-rays provide a powerful tool for further high-energy studies. Here we propose 25ks Chandra observations of the 5 higher-flux radio-quiet gamma-ray pulsars which have no X-ray counterparts nor deep X-ray observations. We aim at better constraining their X-ray properties and to get a handle on their distance, a crucial parameter which is beyond reach for radio-quiet objects.

R.A. Dec. Target Name Det. Grating Exp.Time
20:28:19.90+33:32:04.60PSR J2028+3332ACIS-SNONE25
20:30:51.50+44:15:36.70PSR J2030+4415ACIS-SNONE25
19:57:38.90+50:33:18.00PSR J1957+5033ACIS-SNONE25
21:39:55.90+47:16:13.10PSR J2139+4716ACIS-SNONE25
14:29:58.60-59:11:36.60PSR J1429-5911ACIS-SNONE25

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 14500725

Title: G11.2-0.3: Core-Collapse Supernova Progenitors, Cosmic Rays, and Pulsar-Wind Nebulae

PI Name: Stephen Reynolds

We propose a 400 ks observation of the young supernova remnant G11.2-0.3, a shell containing a pulsar-wind nebula and known pulsar, to address fundamental issues of core-collapse supernovae. Our observation should allow the determination of expansion proper motions and search for variability in the PWN; a sensitive search for thin rims of synchrotron X-ray emission; and greatly improved spectral characterization of shell emission, ejecta knots ahead of the blast wave, and mysterious interior thermal emission. G11.2-0.3 may be the remnant of a Type IIL/b (partially stripped) supernova, in which case our observations can constrain the nature of the progenitor wind, as well as give information on shock acceleration of electrons and the evolution of the interior pulsar-wind nebula.

R.A. Dec. Target Name Det. Grating Exp.Time
18:11:29.40-19:25:25.00G11.2-0.3ACIS-SNONE400

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 14500751

Title: Target-of-Opportunity Chandra Observations of Glitching High-B Radio Pulsars: Searching for Magnetar Metamorphoses

PI Name: Victoria Kaspi

In 2006 observations of a high-magnetic-field rotation-powered pulsar (RPP), we observed a sudden "magnetar metamorphosis" simultaneous with a rotation glitch. The RPP's X-ray flux increased by a factor of 10, its spectrum changed dramatically, and it emitted magnetar-like X-ray bursts. After <8 weeks, it returned to its normal state. This amazing event, caught serendipitously, suggests that all high-magnetic-field RPPs may undergo transient metamorphoses at glitch epochs, but have not been so recognized because of the absence of a sensitive X-ray all-sky monitor. We therefore request Chandra ToO observations of one high-magnetic-field RPP when it has a large glitch or X-ray burst in order to test this hypothesis.

R.A. Dec. Target Name Det. Grating Exp.Time
01:57:49.90+62:12:25.90PSR B0154+61ACIS-SNONE105
07:26:08.10-26:12:38.10PSR J0726-2612ACIS-SNONE105
08:47:57.00-43:16:57.20PSR J0847-4316ACIS-SNONE105
10:01:32.20-59:39:17.80PSR J1001-5939ACIS-SNONE105
11:19:14.30-61:27:49.50PSR J1119-6127ACIS-SNONE105
16:32:39.70-48:18:52.60PSR J1632-4818ACIS-SNONE105
17:18:10.00-37:18:53.00PSR J1718-3718ACIS-SNONE105
17:26:07.50-35:29:58.00PSR J1726-3530ACIS-SNONE105
17:34:26.60-33:33:22.00PSR J1734-3333ACIS-SNONE105
17:40:33.80-30:15:43.50PSR B1737-30ACIS-SNONE105
18:14:43.10-17:44:48.00PSR J1814-1744ACIS-SNONE105
18:19:33.80-14:58:01.00PSR J1819-1458ACIS-SNONE105
18:21:34.30-14:19:26.00PSR 1821-1419ACIS-SNONE105
19:13:50.80+04:46:06.00PSR J1913+0446ACIS-SNONE105
19:18:23.60+14:45:06.00PSR B1916+14ACIS-SNONE105
New High-B pulsarACIS-SNONE105
18:47:35.20-01:30:46.00PSR J1847-0130ACIS-SNONE105

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 14500839

Title: An asymmetric X-ray nebula around the magnetar SGR1806-20?

PI Name: Nanda Rea

We have recently discovered of an asymmetric diffuse X-ray emission around the soft gamma-ray repeater SGR 1806-20 detected by a Chandra HRC-S observation about 116 days after the 2004 December 27 a giant flare. Radio observations performed few days after the Chandra observation with the VLA show that expanding radio nebula which followed the giant flare matches the diffuse X-ray emission. We ask for a further 30ks Chandra HRC-S observation to search for variability in the X-ray extended emission, crucial to assess its nature.

R.A. Dec. Target Name Det. Grating Exp.Time
18:08:39.30-20:24:39.50SGR 1806-20HRC-SNONE30

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 14500851

Title: The Astrophysics of the Most Energetic Gamma-Ray Bursts

PI Name: Andrew Fruchter

The Large Area Telescope (LAT) of Fermi has found a sample of highly relativistic gamma-ray bursts (GRBs), which may be among the most energetic bursts ever discovered. Here we propose to use Chandra, HST and the EVLA to follow the late time light curve of a LAT detected burst that also has excellent early multi-wavelength coverage. Our observations, in conjunction with the Fermi data, will allow us to measure the energy and the bulk Lorentz factor of the explosion. Recent work on some of the most powerful GRBs begins to substantially constrain physical models of the progenitors. The energetics of the highly relativistic LAT bursts may greatly strengthen these constraints and provide new insight into the currently unknown mechanism that determines the energy in a GRB.

R.A. Dec. Target Name Det. Grating Exp.Time
LAT Burst 1ACIS-SNONE120

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 14500852

Title: Chandra observations of 4 Fermi-LAT-detected Supernova Remnants with pulsar-like gamma-ray emission

PI Name: Pablo Saz Parkinson

The Large Area Telescope (LAT) on Fermi has detected over 100 gamma-ray pulsars and several dozen Supernova Remnants (SNRs). Many of the newly-discovered gamma-ray pulsars are positionally coincident (and likely associated) with SNRs. Indeed, the number of pulsar-SNR associations has grown dramatically thanks to Fermi. Disentangling the gamma-ray emission due to the pulsar from that due to the SNR is crucial to explaining the nature of such emission. We propose to observe 4 relatively bright SNRs associated with LAT 2FGL sources with pulsar-like properties, with the goal of enabling the discovery of the pulsars associated with such SNRs.

R.A. Dec. Target Name Det. Grating Exp.Time
17:38:56.70-29:08:24.70G359.1+0.9ACIS-INONE11
14:05:30.00-61:21:51.80G311.5 0.3ACIS-INONE13
12:14:01.20-62:37:11.30G298.6 0.0ACIS-INONE20

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 14500895

Title: Studying Particle Acceleration and Ejecta in Northwest Rim of the Supernova Remnant RCW 86 with Chandra

PI Name: Daniel Castro

We propose to observe the northwest rim of the supernova remnant RCW 86 for 100 ks with the ACIS-I array. XMM-Newton and Suzaku observations of this region show synchrotron emission from electrons accelerated at the forward shock as well as enhanced metal abundances from the SN ejecta. This region of RCW 86 has never before been imaged by Chandra, and the superb spatial resolution and spectro-imaging capabilities of Chandra are critical to probe the conditions of the particle acceleration and the shock-heated plasma.

R.A. Dec. Target Name Det. Grating Exp.Time
14:41:46.00-62:14:08.00RCW 86ACIS-INONE100

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 14500898

Title: Identifying the TeV gamma-ray source MGRO J2228+61, FINALLY!

PI Name: Ester Aliu

New VERITAS observations of MGRO J2228+61 allow us to associate its TeV emission with the enigmatic radio supernova remnant SNR G106.3+2.7. This remnant is part of a large complex that includes the Boomerang pulsar and nebula. The reduced field suggests that the TeV emission is not powered by the Boomerang, but instead associated with a much larger remnant. A recent SUZAKU X-ray observation of the smaller gamma-ray error box reveals two possible pulsar candidates. We propose short ACIS exposures to identify these sources to determine if one or both can be responsible for the gamma-ray emission. This will allow us to address the long standing problem on the nature of both MGRO J2228+61 and SNR G106.3+2.7.

R.A. Dec. Target Name Det. Grating Exp.Time
22:26:00.50+60:47:20.50Suzaku J2226+6047ACIS-SNONE10
22:27:37.10+60:54:13.70Suzaku J2227+6054ACIS-SNONE15

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 14500928

Title: A comparative study of two outstanding pulsar tails

PI Name: Oleg Kargaltsev

Long pulsar tails detected in X-rays and radio are believed to result from the supersonic motion of pulsars through the ISM. The processes responsible for the tail formation, collimation, and stability are poorly understood. Short Chandra observations of two outstanding pulsar tails allowed us to characterize their general properties, but much remains to be learned about the complex physics of magnetized collimated flows. We propose much deeper observations of these two tails which show very different properties. We will measure their shapes and internal structures, perform definitive spatially-resolved spectroscopy, and study the connection with the radio tails. The results will advance our understanding of magnetized collimated outflows and their interaction with the ambient medium.

R.A. Dec. Target Name Det. Grating Exp.Time
15:09:27.10-58:50:56.10PSR J1509-5850 nebulaACIS-INONE380
17:47:25.90-29:59:58.00The MouseACIS-INONE120

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 14500933

Title: X-Ray Signatures of Late-Time Circumstellar Interaction in Type IIn Supernovae

PI Name: Ori Fox

Our recent Spitzer survey discovered 9 Type IIn supernovae (SNe IIn) with unreported late-time (>3 years) infrared excesses. Identifying the origin of the warm dust constrains the circumstellar and progenitor properties. The data suggest a dust-shell continuously heated by radiation generated from ongoing shock interaction. We propose to validate the model with ACIS observations of 3 SNe in the sample (2005cp, 2008en, 2008gm). X-rays serve as a discriminator of shock interaction. While most SNe are faint at late-times, previous Chandra observations of other SNe IIn in our Spitzer sample suggest shock interaction will be detectable out to 150 Mpc. Given the Spitzer results indicate some heating source is currently present, now is the time for Chandra observations before the SNe fade.

R.A. Dec. Target Name Det. Grating Exp.Time
23:14:12.40-02:46:52.40SN 2008gmACIS-SNONE25
23:59:30.90+18:12:09.60SN 2005cpACIS-SNONE25
00:55:13.60+35:26:26.20SN 2008enACIS-SNONE45
Smithsonian Institute Smithsonian Institute

The Chandra X-Ray Center (CXC) is operated for NASA by the Smithsonian Astrophysical Observatory. 60 Garden Street, Cambridge, MA 02138 USA.   Email:   cxchelp@head.cfa.harvard.edu Smithsonian Institution, Copyright © 1998-2017. All rights reserved.