The analysis of the data products in FITS format can be performed using the XANADU and FTOOLS suite of programs.
Public domain software can be used to view the GIF files (e.g. xv on UNIX or directly from the Netscape browser on any system PC and MAC).
General FITS file manipulation : The FTOOLS package, futils , provides a suite of programs that can be used to view and manipulate any of the GINGA archive files. To view the data particularly useful are the tasks fplot (to plot the data), fdump (to dump the data file content), fstruct and flcol (to get the structure and column name of the FITS files). Basic selection and column manipulation can be done using fselect (to select rows based on the result of a boolean expression), fcalc (to calculate values for new column based on arithmetic expression) and fstatistic (to compute standard statistical value on a column). Alternatively most of the operations (and more) mention above can be done using fv , the interactive FITS file viewer and editor.
Spectra and Lightcurves :
Spectra and lightcurves can be analyzed using
Xspec is a general spectral fitting programs, providing a number of already
made standard models. To use XSPEC with the GINGA archive files,
it is necessary to extract from the archive a source and background
spectrum and a response matrix.
First Reduction Files (FRF): There are no mission-specific software to extract scientific information (spectra, lightcurves) from the FRFs. However the FRFs can be viewed and manipulated using fplot and fsumrows . Fplot will allow one to display up to 8 rows of the 48 channel spectra from one of the LAC detectors. An example of the use of fplot is given here. Fsumrows will allow multiple spectra to be summed together. The same 8 rows in the previous example are summed and then displayed in fplot in this example.
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Last modified: Tuesday, 21-Apr-2020 10:46:25 EDT