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The User's Guide to Ginga Data Reduction.

The third Japanese X-ray satellite, Ginga, was launched from the Kagoshima Space Center, Japan, on 5th February 1987 and re-entered the atmosphere on 1st November 1991. The main instrument on board Ginga was the Large Area Counter (LAC), which was designed and built by a scientific team involving the X-ray Astronomy Group at Leicester, the Space Science Department at RAL, and groups from ISAS, Tokyo and Nagoya in Japan. Ginga made over 1000 observations of celestial X-ray sources with the LAC.

The Ginga data analysis software is based around the Leicester Data Analysis System (LDAS), which has previously been used to analyse EXOSAT data. The Ginga specific software forms an interface to the raw data files and provides facilities for sorting and cleaning data, background subtraction, and attitude correction. It also includes some spectral fitting and timing analysis software. The analysis of a typical Ginga observation is based around data cubes, which contain temporal, spectral and detector information. The software runs on DEC Alpha machines running the OSF/1 operating system.

This document was originally written by Rees Williams and Barry Kellett, and updated by Jackie Butcher at the same time as the software was ported to Unix. It is intended for astronomers who wish to analyse Ginga data from the raw data files, providing greater flexibility than is possible from the Ginga products databases. This document is intended to give the user enough information to perform Ginga data reduction, but it cannot cover every aspect of the Ginga satellite or the LDAS.



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