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The spectra and light curves of two gamma-ray burstsObservations made by the Hard X-ray and Low Energy Gamma-Ray Experiment on board HEAO-1 of the spectra and light curves of two gamma-ray bursts for which localized arrival directions will become available are presented. The burst of October 20, 1977 is found to exhibit a fluence of 0.000031 + or - 0.000005 erg/sq cm over the energy range 0.135-2.05 MeV and a duration of 38.7 sec, while that of November 10, 1977 is found to have a fluence of 0.000021 + or - 0.000008 erg/sq cm between 0.125 and 3 MeV over 2.8 sec. The light curves of both bursts exhibit time fluctuations down to the limiting time resolution of the detectors. The spectrum of the October burst can be fit by a power law of index -1.93 + or -0.16, which is harder than any other gamma-burst spectrum yet reported. The spectrum of the second burst is softer (index -2.4 + or - 0.7), and is consistent with the upper index in the double power law fit to the burst of April 27, 1972.
Document ID
19810045325
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Knight, F. K.
(California Univ. La Jolla, CA, United States)
Matteson, J. L.
(California Univ. La Jolla, CA, United States)
Peterson, L. E.
(California, University La Jolla, Calif., United States)
Date Acquired
August 11, 2013
Publication Date
March 1, 1981
Subject Category
Astronomy
Accession Number
81A29729
Funding Number(s)
CONTRACT_GRANT: NAS8-27974
Distribution Limits
Public
Copyright
Other

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