GINGAASMLC - Ginga ASM Source Lightcurves
All Sky Monitor on board the GINGA satellite and its performance. Tsunemi H., Kitamoto S., Manabe M., Miyamoti S., Yamoshita K., Nakagawa, M. <Publ. Astron. Soc. Japan, Vol. 41, 391 (1989)> =1989PASJ...41..391T
The ASM experiment consisted of two identical gas proportional counters operating in the energy range between 1-20 keV. Each detector is composed of three chambers that operate independently and provide each other with mutual anti-coincidence shielding. The instrument is subtended by six different collimators with a field of view of roughly 1 deg x 45 deg and covers about the 70% of the sky when the satellite rotates around the Z-axis. Each of the ASM chamber has a maximum effective area of about 70 cm2.
The ASM experiment worked from 1987 until 1991 and was the only ASM hard X-ray detector operating during that period. (ROSAT was launched in June 1990.)
The lightcurves are calculated for 208 sources using all the detectors in the ASM. The lightcurves are in three energy bands 1-6 keV, 6-20 keV, and 1-20 keV, and they are stored in a single FITS file in three separate extensions. The count rates are background-subtracted.
Designation of the observed object.
The nominal Right Ascension of the source sky object. This parameter was originally given in B1950 equatorial coordinates with a precision of 0.0001 degrees.
The nominal Declination of the source sky object. This parameter was originally given in B1950 equatorial coordinates with a precision of 0.0001 degrees.
Nominal Galactic Longitude of the source sky object.
Nominal Galactic Latitude of the source sky object.
The start time of the observation.
The end time of the observation.
The duration of the observation (i.e., End_Time minus Start_Time), in days.
Number of points in the lightcurve.
Mean count rate of the 1-20 keV lightcurve in units of count/s/cm2. This is calculated using all the points within the lightcurve. (See the parameter Num_Points.)
Minimum count rate of the 1-20 keV lightcurve in units of count/s/cm2.
Maximum count rate of the 1-20 keV lightcurve in units of count/s/cm2.
Standard deviation of the 1-20 keV lightcurve rates. This is calculated using all the points within the lightcurve. (See the parameter Num_Points.)
This parameter identifies the file names of the FITS lightcurve data product and the GIF plot for the specified source.