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Hard X-ray spectra of cosmic gamma-ray burstsHard X-ray measurements of six gamma-ray bursts observed during the period from October 1969 to April 1971 are presented. The measurements were made with detectors on the OGO-5 and OSO-6 satellites. Spectra for five of the six bursts have been determined using measurements from both satellites in order to reduce ambiguities due to uncertain source locations. A significant fraction, about 20-60%, of the energy of the bursts falls in the hard X-ray range (20-130 keV). The time-integrated spectra have been fitted by power-law, exponential, and thermal-bremsstrahlung functions. They are consistent with power laws which steepen at energies of at least 150 keV, as reported earlier for two other bursts. Evidence for spectral variability from event to event in the hard X-ray region is presented. For a power-law representation, the power-law index has values ranging from approximately unity to 2.5. The hard X-ray spectra of the gamma-ray bursts differ significantly from those of the recently discovered 1-15-keV X-ray bursts.
Document ID
19780026671
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Kane, S. R.
(California, University Berkeley, Calif., United States)
Share, G. H.
(U.S. Navy, E. O. Hulbert Center for Space Research, Washington D.C., United States)
Date Acquired
August 9, 2013
Publication Date
October 15, 1977
Publication Information
Publication: Astrophysical Journal
Subject Category
Space Radiation
Accession Number
78A10580
Funding Number(s)
CONTRACT_GRANT: NGL-05-003-017
Distribution Limits
Public
Copyright
Other

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