Grating Spectroscopy

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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.

Chandra Grating Analysis Page
WebGUIDE: Interactive GUIDE for ATOMDB
Chandra Grating Data Archive and Catalog (TGCat): a browsable interface to analysis-quality spectral products.
The chandra_repro script may be used to easily reprocess Chandra datasets.
General:
- Examining Grating Spectra and Regions: PHA2 files
- 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:
- HETG/ACIS-S Grating Spectra (6 Jan 2025)
- HETG/ACIS-S/CC-Mode Grating Spectra
- Grating Spectra for Multiple Sources - ACIS
- ACIS-S Grating RMFs (06 Jan 2025)
- HETG/ACIS-S Grating ARFs (06 Jan 2024)
- Grouping a Grating Spectrum
LETG/ACIS:
LETG/HRC-S:
- LETG/HRC-S Grating Spectra
- Applying Customized Background Regions to LETG/HRC-S Observations
- Grating Spectra for Multiple Sources - HRC
- Higher-order Responses for HRC-S/LETG Spectra
- HRC Grating RMFs
- LETG/HRC-S Grating ARFs
- Grouping a Grating Spectrum
- The calibration page Optimized LETG/HRC-S Extraction Region and Recalibrated EEFRACs contains information needed to use the detilt, dewiggle, and symmetrize scripts.
LETG/HRC-I:
Combining Spectra & Preparation for Fitting:
Modeling & Fitting Grating Data with Sherpa
(from the Sherpa analysis threads):

/ ciao4.17 / threads / gspec.html

Grating Spectroscopy

General:

Problems with the Zero Order:

HETG/ACIS:

LETG/ACIS:

LETG/HRC-S:

LETG/HRC-I:

Combining Spectra & Preparation for Fitting:

Modeling & Fitting Grating Data with Sherpa (from the Sherpa analysis threads):

Modeling & Fitting Grating Data with Sherpa
(from the Sherpa analysis threads):