LETG Data Analysis

• The Chandra data archive contains all of the Chandra data which have been processed by the CXC. Most observations are proprietary for one year, after which they become public.
• Analysis ready HETG data products (PHA, ARF, RMF) can be viewed and retrieved from the TGCat.
• WebChaSeR is an online tool to search and download Chandra data. See also the CIAO thread showing additional methods for downloading data from the archive.
• Standard Data Processing is the "pipeline" reduction that is performed on all Chandra science data.
• The following software packages can be used to analyze LETG data:
  • Sherpa is the CIAO modeling and fitting application.
  • XSPEC and FTOOLS are the HEASARC's package for X-ray spectral analysis.
  • PINTofALE is a package for Interactive Analysis of Line Emission.
  • ISIS is a package for general spectroscopic analysis and an interface to ATOMDB for detailed line emission analysis.
• CIAO Guide to analyzing LETG/HRC-S data
• CIAO Guide to analyzing LETG/ACIS-S data
• The Analysis Guide for Chandra High Resolution Spectroscopy provides a comprehensive overview of the processing and analysis of Chandra data obtained with the transmission grating instruments.

LETG Data Products

• An Introduction to Data Products gives a description of the data files in a typical Chandra observation.
• Data Products Basics gives an introduction to file formats, software versions and calibration products.
• The Data Products Guide gives descriptions of all files created by standard processing.
• The Calibration Database contains the latest calibration files. CALDB files are in standard FITS format and designed for use in CIAO and other analysis programs.
• TGCat is a source of analysis-ready products.