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News Previous Items

07 Nov 2006 [New]

CALDB version 3.2.4 has been released. This release contains ACIS time-dependent gain calibration files only. See the How CALDB 3.2.4 Affects Your Analysis section of the CIAO release notes and the CALDB release notes for details.

Download CALDB 3.2.4

31 Jul 2006

New webpage: Effective Area Cross-calibration Results Involving the Chandra X-ray Observatory

This webpage provides a discussion of cross-calibration work relating the Chandra X-ray Observatory to other X-ray missions, particularly XMM-Newton. Much of this webpage was developed in cooperation with the XMM-Newton calibration team.

Grating Spectroscopy

WHAT'S NEW | WATCH OUT

| Top | All | Intro | Data Prep | Timing | Imag | Imag Spec | Grating | S-Lang | Datasets || Proposal | ChaRT | Sherpa |

If new calibration has been applied to the event file, the grating spectrum should be re-extracted as well. It is then possible to build grating response files (gARF, gRMF) in order to model and fit the data in Sherpa.

Visit the Chandra Grating Analysis Page
ATOMDB: CIAO's spectroscopic library
WebGUIDE: Interactive GUIDE for ATOMDB version 1.3
General:
- Examining Grating Spectra and Regions: PHA2 files
- Updating dmgroup Syntax for CIAO 3
- Why topic: ACIS QE Degradation
- Correcting Responses for ACIS Contamination
- Measure Grating Dispersion Distance
  Uses: the tg_scale_reg S-Lang script
- Create an Order-Sorting Image
  Uses: the tg_osort_img S-Lang script
- Create a Color Spectrum
Problems with the Zero Order:
- Correcting a Misplaced Zero-order Source Position
- Source Position for Grating Data with a Piled or Blocked Zero Order
HETG/ACIS:
- Obtain Grating Spectra from HETG/ACIS-S Data
- Obtain Grating Spectra for Multiple Sources - ACIS
- Create Grating RMFs for ACIS-S Observations
- Compute HETG/ACIS-S Grating ARFs
  Uses: the fullgarf script
- Grouping a Grating Spectrum
LETG/ACIS:
- Obtain Grating Spectra from LETG/ACIS Data
- Obtain Grating Spectra for Multiple Sources - ACIS
- Create Grating RMFs for ACIS-S Observations
- Compute LETG/ACIS-S Grating ARFs
  Uses: the fullgarf script
- Grouping a Grating Spectrum
LETG/HRC-S:
LETG/HRC-I:
Combining Spectra & Fitting:
- Extract Coadded and Grouped Nth-Order Source & Background Spectra and ARFs
  Uses: the add_grating_orders script
- Add Grating Spectra and Average ARFs
  Uses: the add_grating_spectra script
- Sherpa: Fitting Grating Data
- Create PHA Background File for Use in XSPEC
  Uses: the tg_bkg script
- Sherpa: GUIDE: Fitting and Identifying Spectral Lines

Hardcopy (PDF): A4 | Letter

Last modified: 19 July 2006

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