ASCA Processing Documentation
Processing Version 7.4.0
(Revision 2)
These pages document the standard processing of ASCA data
done at the NASA Goddard Space Flight Center.
You may also view a list of
changes from previous versions.
Processing is done by a set of modular routines
each of which performs a major processing step.
This page shows the order in which these routines are called
and provides links to more detailed information.
If you have questions that this document does not answer,
you can contact
ascahelp@athena.gsfc.nasa.gov.
Processing has a top level script:
process (version 3.2)
Set up for processing and call the subroutines which process the data
This script executes processing steps in the following order:
- telemetry (version 3.0)
Fetch the telemetry and attitude files.
- aspecting (version 1.6)
Calculate the aspect point from the attitude files.
- readfrfs (version 3.2)
Unpack the raw telemetry into FITS event and housekeeping files.
- combine (version 2.1)
Merge the event files created by frfread.
- faint2bright (version 1.3)
Convert FAINT mode files to BRIGHT and BRIGHT2 modes
- linearize (version 1.7)
Run ascalin to calibrate the unfiltered event files.
- fixthings (version 1.5)
Fix a number of possible spacecraft-related problems in the data.
- makefilters (version 1.6)
Create the filter files.
- screen (version 4.2)
Run xselect to screen out bad data.
- images (version 2.8)
Generate images and exposure maps
- sources (version 2.4)
Find sources in the observed fields of view
- spectra (version 3.2)
Extract PI spectra of source and background
- lightcurves (version 2.1)
Extract light curves for each source
- sourceevents (version 1.2)
Extract event files for each source
- framedata (version 1.2)
Extract FRAME mode data from the telemetry.
- calsource (version 2.4)
Extract GIS calibration source spectra
- earthevents (version 2.1)
Extract bright and dark Earth event files
- information (version 1.6)
Calculate various pieces of information
- eventinfo (version 2.6)
Create a descriptive list of all of the event files.
- header (version 1.8)
Create an HTML header page.
- sourceinfo (version 1.1)
Create an HTML page listing the detected sources
- filelists (version 2.1)
Make lists of the files to be distributed.
- wrapup (version 2.0)
Do a final wrap-up of all files.