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

Journal Article · Mon Dec 01 00:00:00 EST 1997 · Astrophysical Journal

DOI:https://doi.org/10.1086/304991· OSTI ID:615366

Seifert, H; Teegarden, B J; Cline, T L; Gehrels, N; in t Zand, J J; Palmer, D M; Ramaty, R ^[1]; Hurley, K ^[2]; Madden, N W; Pehl, R ^[3]

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1. NASA Goddard Space Flight Center, Greenbelt, Maryland20771 (United States)
2. Space Sciences Laboratory, University of California at Berkeley, Berkeley, California94720 (United States)
3. Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California94720 (United States)

The Transient Gamma-Ray Spectrometer (TGRS) on the {ital Wind} satellite is designed to perform spectroscopy of bright gamma-ray bursts in the {approximately}20{endash}8000keV energy range, having a resolution 5{endash}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 {approximately}78.3photonscm{sup {minus}2}s{sup {minus}1} and a fluence (50{endash}300 keV) of {approximately}1.4{times}10{sup {minus}4}ergscm{sup {minus}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 {sigma} in our data. {copyright} {ital 1997} {ital The American Astronomical Society}

• OSTI ID: 615366
• Journal Information: Astrophysical Journal, Vol. 491, Issue 2; Other Information: PBD: Dec 1997
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
COSMIC GAMMA BURSTS
GAMMA SPECTROMETERS
GAMMA ASTRONOMY
GAMMA SPECTRA
LINE WIDTHS