Spectroscopy of bright bursts with the transient gamma-ray spectrometer (TGRS)

The Transient Gamma-Ray Spectrometer (TGRS) on the WIND spacecraft is designed to perform spectroscopy of bright gamma-ray bursts (GRBs) in the ∼20–8000 keV energy range, with a spectroscopic resolution which is 5–30 times better than that of earlier-generation detectors. During its first ∼2.5 years of operation, TGRS detected ∼90 GRBs, of which about one third are suitable for statistically interesting spectroscopy. We present preliminary comparative results for some of the brightest of those bursts, and which were also observed by CGRO/BATSE.