The Ginga Archive
The Ginga archive includes High level products, such as lightcurves and spectra in FITS format and accompanying GIF view, and the raw data, which have been reformatted into FITS. The data are all for the Large Proportional Counter (LAC) experiment. No data are available for the All-Sky Monitor or the Gamma-Ray detector.
Different groups have contributed to the final LAC Ginga archive. The University of Leicester generated the LAC source and background spectra and the source lightcurves, while Penn State University (via an ADP grant) provided the LAC raw data and the HEASARC provided the LACDUMP. The Tenma data restoration was included in the same Ginga ADP proposal, as a possible data set to be done after the completion of Ginga if resources allow. However the Tenma attitude information was found to be lost, making this effort not feasible.
There are 5 databases dedicated to Ginga from which data can be retrieved. High level data (spectra and lightcurves) and raw data files are available for retrieval. The Ginga database can be accessed via Browse . Ginga data are located in the GINGA FTP area in the HEASARC archive.
A separate restoration effort of the Ginga data was carried out by ISAS in Japan. During the mission lifetime, at ISAS and other Japanese institutes data and analysis software resided on a FACOM main-frame computer. The restoration effort approch was not to modify the original telemetry data structure when porting the data into FITS. This allows a minimum change to the analysis software which was ported from main-frame computer to a unix enviroment. The archive of these data and software opened in March 2004 and they are available from the Japanese Data ARchive and Transfer System, DARTS, at ISAS.
High Level Products : Spectra and lightcurves were extracted for the pointed target observations and background observations. To each observation (target or background) several products were extracted. In particular there are spectra and lightcurves for the Mid and Top layer. The lightcurves have been extracted in 4 energy ranges, 2-6, 6-7, 7-17 and 2-17 keV respectively. These products are in FITS and GIF format. There are also available several plots, in GIF format, showing various correlations of the HK parameters and there are two sets of response matrices for the Top and Mid layers. All of the FITS files were produced at the U. of Leicester in exchange for the ASCA archive. More information on how these products were extracted from the raw data file is available in the document "The Leicester Ginga Databases" (ps version is located in the GINGA FTP area in the HEASARC archive).
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 have associated the same FITS file, but different object name and position.