Transient Gamma-Ray Spectrometer observation of the bright gamma-ray burst GRB 950822

The Transient Gamma-Ray Spectrometer (TGRS) on the Wind satellite is designed to perform spectroscopy of bright gamma-ray bursts in the ∼20 - 8000keV energy range, having a resolution 5 - 30 times better than that of earlier generation detectors. GRB 950822 was the brightest burst observed by TGRS in its first year of operation, with a peak flux (1024 ms) of ∼78.3photonscm-2s-1 and a fluence (50 - 300 keV) of ∼1.4x10-4ergscm-2; therefore, the GRB data in this paper represent the first high-resolution spectroscopy ever performed on a burst of this brightness. The continuum spectrum of GRB 950822 has the classical gamma-ray burst shape and exhibits typical evolution from hard to soft over the course of the burst. We found no evidence of line features or any other spectral fine structure with significance greater than 3.5 σ in our data. copyright 1997 The American Astronomical Society