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Search for gamma-ray transients using the SMM spectrometerObservations for transient radiation made by the Gamma Ray Spectrometer on the SMM satellite are summarized. Spectra were obtained from 215 solar flares and 177 gamma-ray bursts. No narrow or moderately broadened lines were observed in any of the bursts. The rate of bursts is consistent with a constant over the mission but is weakly correlated with solar activity. No evidence was found for bursts of 511 keV line emission, unaccompanied by a strong continuum, at levels not less than 0.05 gamma/sq cm s for bursts lasting not more than 16 s. No evidence was found for broad features near 1 MeV from Cyg X-1, the Galactic center, or the Crab in 12-d integrations at levels not less than 0.006 gamma/sq cm s. No evidence was found for transient celestial narrow-line emission from 300 keV to 7 MeV on min-to-hrs-long time scales from 1984 to 1989.
Document ID
19930044959
Document Type
Reprint (Version printed in journal)
Authors
Share, G. H.
(U.S. Navy, Naval Research Lab. Washington, United States)
Harris, M. J.
(Universities Space Research Association Washington, United States)
Leising, M. D.
(Clemson Univ. SC, United States)
Messina, D. C.
(SFA, Inc. Landover, MD, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1993
Publication Information
Publication: Astronomy and Astrophysics Supplement Series
Volume: 97
Issue: 1
ISSN: 0365-0138
Subject Category
Astronomy
Funding Number(s)
CONTRACT_GRANT: NASA ORDER W-17972
Distribution Limits
Public
Copyright
Other
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