NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
characteristics of bursts observed by the smm gamma-ray spectrometerThe Gamma Ray Spectrometer (GRS) on the SMM completed close to 10 years of highly successful operation when the spacecraft reentered the atmosphere on December 2, 1989. During this period the GRS detected 177 events above 300 keV which have been classified as cosmic gamma-ray bursts. A catalog of these events is in preparation which will include time profiles and spectra for all events. Visual inspection of the spectra indicates that emission typically extends into the MeV range, without any evidence for a high-energy cutoff; 17 of these events are also observed above 10 MeV. We find no convincing evidence for line-like emission features in any of the time-integrated spectra.
Document ID
19930036240
Document Type
Conference Proceedings
Authors
Share, G. H.
(U.S. Navy E.O. Hulburt Center for Space Research, Washington, United States)
Messina, D. C.
(SFA, Inc. Landover, MD, United States)
Iadicicco, A.
(U.S. Navy E.O. Hulburt Center for Space Research, Washington, United States)
Matz, S. M.
(Northwestern Univ. Evanston, IL, United States)
Rieger, E.
(Max-Planck-Inst. for Extraterrestrial Physics Garching, Germany)
Forrest, D. J.
(New Hampshire Univ. Durham, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1992
Publication Information
Publication: In: Gamma-ray bursts - Observations, analyses and theories (A93-20206 06-90)
Subject Category
ASTROPHYSICS
Funding Number(s)
CONTRACT_GRANT: NASA ORDER S-14513-D
Distribution Limits
Public
Copyright
Other