The GRS included seven integral-line calibrated NaI(Tl) detectors for nuclear lines between 0.3 and 0.9 MeV; the energy resolution (full width at half maximum) for these detectors was better than 7% at 0.662 MeV. In addition, a thick CsI(Na) crystal, along with the NaI(Tl) spectrometers, was sensitive to gamma rays in the range 10-140 MeV, and neutrons with energies above 20MeV. Finally, an auxiliary system of two NaI detectors yielded hard X-ray fluxes from 10 to 140 keV. Time resolutions were typically about 2s and 16s but could be as fine as 64 ms for the 300-340 keV energy band. Since the field of view was close to half the sky, GRS observed approximately as many cosmic as solar events, and swept across the galactic center each year as SMM followed the Sun.
We also have gifs of spectra and rate plots available for ftp.
Last Modified: 2006 May 01