GINGA Software
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 and
Xronos respectively.
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.
The GINGA lightcurves can be used in any of the Xronos programs, each
dedicated to a specific timing task.
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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Page authors: Lorella Angelini Jesse Allen
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Last modified: Tuesday, 21-Apr-2020 10:46:25 EDT
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