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Leicester Database and Archive Service
 
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The Leicester Ginga database

The data received from Ginga are stored in First Reduction Files (FRFs) which mirror the telemetry stream from the satellite. The FRFs were originally stored on magnetic tape and the software used to read them was specific to the VMS operating system. As time moved on this reduced the accessibility of the data for astronomers outside Leicester. Therefore, the entire dataset was made available via the WWW and the software ported to the Unix operating system. The user interface to the raw data was made possible by the creation of a GINGAFRF database table which is a conversion of the Ginga "kiroku" or log sheets. In addition, a pipeline processing of the raw data was performed to provide quality-controlled reduced Ginga data which would be accessible to the public.

Two database tables have been made, GINGALAC and GINGABGD, which contain the pointed observations of target and (nominally empty) background fields respectively. These databases not only provide a summary of the results of each observation, but they also provide access to the data products. These include the FITS spectra and light curves, HDS and FITS data cubes and the plots produced during the pipeline processing. These products can be used either with the Ginga data analysis software or the XANADU suite of software. A parallel activity was the creation of background models for the duration of the satellite. These models are crucial to the analysis of the Ginga data. A number of measured and calculated rates were used to derive the spectral background variations with time due to particle interactions with material in the satellite and its subsequent radioactive decays (see Hayashida et al. 1989).


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