Downtime expected shortly as all LEDAS services are moved to a new server.
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
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.