GRANAT was a Russian dedicated X-ray/gamma ray
astronomy mission in collaboration with other European countries.
Launched on 1 December
1989, Granat operated for almost 9 years.
After an initial
period of pointed observations, Granat went into survey mode in September
December 1, 1989 - November 27, 1998 Energy Range :
2 keV - 100 MeV Payload :