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The Leicester Ginga Archive: Software Archive
If you are interested in a Ginga observation not included in
the products database (e.g. MPC2, MPC3 or PC mode data), then you must extract
the data from the raw Ginga data files made available through the LEDAS
archives. There are two routes to extracting Ginga raw data:
original Ginga First Reduction Files (FRFs) are available in HDS format through
the GINGAFRF database table. You will need to use
the Leicester Ginga data analysis software
to analyse this data. A copy is available for local installation from our anonymous
ftp site at ftp/ginga/soft. Documentation is also available as
a postscript file from the same ftp site at ftp/ginga/doc, or as an HTML
document. The data analysis software runs under the OSF/1 operating system
on DEC Alpha machines only. Please note that this software is not intended for
general use as it still requires expertise to fully exploit the data, and that
only limited effort is made available to support its use at remote sites. If you
have not analysed Ginga data before you are advised to
contact us first. Unfortunately, our resources do not allow remote use of
this software on the LEDAS machine.
Ginga FRFs are also available in FITS format through the GINGARAW
database table. The FITS Ginga data are the FRF files converted into FITS
format from their native format (ADP grant, PI Corbet, at Penn State). The FITS
files are bintable with 5 extensions containing raw counts (science data), raw
orbital data, raw operational status data, raw housekeeping data and good time
intervals. The layout of the science data extension consists of several columns
containing counts, stored as an array per row, and one containing time. The datamode
sets the number of channels for the count arrays, how the signal from each counter
is summed (number of columns) and the integration time.
The GINGARAW database
was derived using keywords stored in the primary header of the FITS file. Each
record corresponds to a different pointing position, therefore it is possible
that up to 3 records are associated with the same FITS file, but different object
name and position.
For further information on generating and processing
GINGARAW FITS files, see the Ginga
FITS Data System (GFDS) project page at Penn State. The site provides software
for the GFDS system.
parallel activity to the making of the products database was the creation of background
models for the duration of the Ginga mission. These models are crucial
to the analysis of Ginga data, as the main instrument has no means of simultaneously
monitoring the background count rate. A number of measured and calculated rates
were used to derive the spectral-temporal background variations due to particle
interactions with the material of the satellite and its subsequent radioactive
decay (see Hayashida et al. 1989). These
models have been made available with the software.