CDA - Release Notes
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- The archive is fully functional.
Reprocessing IV has been completed in December 2014.
- ASCDSVER: 10.11.1
- CALDBVER: 4.10.5
- Electrical Outage 11/05/21 - 11/06/21
There will be a planned electrical outage Friday, November 5 2021, 5:30PM - Saturday, November 6 2021, 6:00PM EDT. During this time period ChaSeR and other archive interfaces will be unavailable.
- Electrical Outage on 07/28/21
There will be a planned electrical outage Wednesday, July 28 2021, 8:00PM - 10:00PM EDT. During this time period ChaSeR and other archive interfaces will be unavailable.
- Downtime on 6/12/21
Due to electrical work, the public interfaces of the Chandra Data Archive will not be available on Saturday 6/12 from 4 AM to 9 PM.
- Repro V Begins
The fifth major reprocessing of the archive (Repro V) has started! Details can be found here.
- Past Notices
This page provides a summary of the changes, significant for the science data in the archive, that were implemented in subsequent CXC software and CalDB releases used in Standard Data Processing.
The CalDB version may be identified through the FITS keyword CALDBVER.
The SDP software version may be identified through the FITS keyword ASCDSVER.
- Release notes for software versions 6.0.0 (May 2001) through 6.9.0 (September 2002) are available from a separate web page.
- Software from version 6.9.2 (October 2002) onward.
Major CalDB Changes
The following indicate upgrades to the calibration or the ACIS instrument as apply to standard data processing (ACIS Level 1 and 2).
|2008-09-10T15:30||3.5.0||T_GAIN||T_GAIN corrections for Epoch 34 (May - July 2008)|
|2008-06-16T17:00||3.4.5||T_GAIN||T_GAIN corrections for Epoch 33 (Feb - Apr 2008)|
||T_GAIN corrections for "Epoch 0" (Sep 1999 - Jan 2000) T_GAIN for BI chips only, with appropriate DET_GAIN updates for the BI chips, including the much improved ACIS-S1 gain tables.|
|2008-03-27T13:53||3.4.3||T_GAIN||T_GAIN corrections for Epoch 32 (Nov 2007 - Jan 2008)|
|2007-12-12T13:00||3.4.2||T_GAIN||T_GAIN corrections for Epoch 31 (Aug-Oct. 2007)|
|2007-09-19T14:30||3.4.1||T_GAIN||T_GAIN corrections for Epoch 30 (May-July 2007)|
|2007-05-22T12:00||3.4.0||T_GAIN||T_GAIN corrections for Epochs 28 (Nov 2006 - Jan 2007) and 29 (Feb - Apr 2007)|
|2006-12-13T16:01||3.3.0||T_GAIN||TGAIN updates for Epoch 27 (Aug - Oct 2006)|
|2006-03-06T16:00||3.2.2||T_GAIN||Time-dependent gain correction (T_GAIN) updates for Epoch 23 (Aug - Nov 2005) and Epoch 24 (Nov 2005 - Jan 2006) for the CTI configuration CTI_APP=PPPPPNPNPP, or Parallel CTI correction for FI chips, and NO CTI correction for the BI chips.|
|2005-12-15T17:30:00||3.2.1||BADPIX||-120° C Version N0003: Status bits changed on node boundary chips so they are not counted as normal bad columns. Hence adjacent columns will not be automatically included in the *bpix1.fits primary data files.|
|2005-11-16T16:00:00||3.2.0||DETGAIN||CTI files version N0005, time-dependence added to FI chips to account for decay in their resolution with time. Two files have been included, for T_GAIN epochs 1-10 and 11-current. Only the S2 data for epochs 1-10 are updated with a better model.(BI chip CTI corrections are not yet included.)|
|2005-11-15T15:30:00||3.2.0||BADPIX||An improved bad pixel map|
|2005-06-23T15:17:00||3.1.0||T_GAIN||Time-dependent gain corrections to the PHA in Level 1|
|2005-06-23T15:17:00||3.1.0||CTI||Phase 2 response gains for Chips 4, 8, and 9 (S0,4,5), making the set complete for use with mkacisrmf.|
|2004-12-14T18:00:00||3.0.0||DETGAIN||S1-3, I0-3 gain function modifications (improved gain model) near the Si-K edge|
|2004-12-14T18:00:00||3.0.0||DETGAIN||S1 gain function improvements for imaging and gratin (order-sorting) observations|
The following table includes upgrades to the HRC-I and HRC-S L1 and L2 calibration files.
|2007-09-19T14:30||3.4.1||DEGAP||HRC-I: Degap solution correction for large negative SIM_Z offsets; Currently important for only to one or two observations.|
|2007-05-06T15:00||3.4.0||GAIN MAP||HRC-I: Refinements of the time-dependent gain maps in CalDB 3.3.0. These are the current calibration standard for HRC-I GMAPs.|
|2006-12-13T16:01||3.3.0||GAIN MAP||HRC-I: Time-dependent gain maps, spaced approximately annually along the mission time line. These data are upstaged by CalDB 3.4.0 (see the next row of the table).|
|2006-08-10T15:30||3.2.3||GAIN MAP||HRC-I: Correction to 1998-10-30 gain map registration|
|2006-08-10T15:30||3.2.3||DEGAP||HRC-I: Improved on-axis degap solution|
|2005-11-16T16:00:00||3.2.0||GAINMAP||Gain maps included in processing for HRC-I for the first time, version N0001. Second file applies to all data after HV was reduced in the HRC-I, on 1999-10-04.|
|2004-08-11T19:30:00||2.28||BADPIX||Upgrades to the bad pixel map for HRC-S.
This new file has a time-dependent addition for a rectangular hot spot on plate 1 of HRC-S, which recently became enlarged.
|2002-04-04T15:05:00||2.13||BADPIX||Upgrades to the bad pixel map for HRC-I|
|2002-11-08T00:00:00||2.4||EVENT FILTER||Upgrades to event tests to eliminate ghost images and some background events, such as event flatness, tapringing, amplifier saturation, and f-p test|
|2001-03-07T14:50:00||2.3||EVENT FILTER||HRC-S GAIN and PI region filters for background elimination|
|2001-01-25T18:00:00||2.2||DEGAP||Improved gap removal calibrations for HRC-I|
The following upgrades to the Aspect calibration files are relevant for observations taken since the lowering of the Aspect Camera CCD operating temperature, and to the shut-off of the ACIS detector housing heater assembly. Observations taken before the relevant dates in the descriptions given are not affected by these upgrades, and no ASPECT reprocessing or correction is needed for observations downloaded from the current archive, unless otherwise indicated in the ObsID summary pages.
||The change here is to add a third BINTABLE to the ALIGN/FID_POS files, namely the FID_COR table, needed after the ACIS Detector Housing Heater shutoff, which took place during April of 2008.|
||Two new ALIGN/FID_POS epochs have been added, for effective from the dates 2003-06-09T00:00:00 and 2006-12-10T00:00:00. The cooling of the ASPECT CCD began on 2006-12-10. Minor astrometric corrections beyond 2002-12-01 are included in the 2003-06-09 file.|
|2003-12-30T14:00:00||2.25||ASTROMETRY||Astrometry corrections to within 0.2 arc seconds on axis, in particular for ACIS|
|2005-02-15T16:45:00||3.0.1||AIMPOINTS||Version N0002, HRC-S imaging default aimpoint added.|
|2001-10-22T16:00:00||2.9||GEOM||Off-axis astrometry improvements for outlying ACIS chips. spectra more mutually consistent.|
Other areas of the CalDB have been significantly upgraded since the second reprocessing run, e.g., the response input data for ACIS (CalDB 3.2.0), the spatially-dependent ACIS OBF contamination correction (CalDB 3.0.0), the LSF parameter input data for grating RMFs (CalDB 2.27, 2.28), the upgrades in the detector quantum efficiencies and uniformities (CalDB 2.9 for HRC-I, 2.28 for ACIS, 3.0.1 for HRC-S), and the HRMA effective area modifications (CalDB 3.2.1). However, these do not directly affect processing through Level 2.
Major Software Changes
Updates since Version 6.9.2
|Date||DS software version||Description|
|2004-06-25||7.3.1||No change (most data are still labeled as 7.3.0)|
|2004-04-26||7.2.2||No change (most data are still labeled as 7.2.1)|
|2003-10-06||7.0.3||No change (some data labeled as 7.0.2)|
|2003-05-06||6.12.0 (6.11.0 deployed at the same time)||
|2003-05-06||6.11.0 (deployed at the same time as 6.12.0)||