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Energy spectra of cosmic gamma-ray burstsSpectral measurements of six cosmic gamma-ray bursts in the energy region of 0.1 to 1.2 MeV, made using a semi-omnidirectional X-ray detector on IMP-6 are reported. These measurements confirm the hard X-ray or gamma-ray nature of the bursts, as inferred from the original observations by Klebesadel et al., (1973), and show that their maximum energy release is in this several hundred keV region. Each burst consists of several 1 or 2-second pulses each with the characteristic spectrum of approximately 150-keV exponential, followed by a softer decay. There is no evidence of line structure in this energy region, or for a marked change in the energy spectrum within a given pulse. Event size spectra are estimated for galactic and extragalactic models; the total emission is consistent with present measurements of the diffuse background, and unlikely to account for any spectral feature in the few-MeV region.
Document ID
19730021092
Acquisition Source
Legacy CDMS
Document Type
Preprint (Draft being sent to journal)
Authors
Cline, T. L.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Desai, U. D.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Klebesadel, R. W.
(LASL)
Strong, I. B.
(LASL)
Date Acquired
September 2, 2013
Publication Date
July 1, 1973
Subject Category
Space Radiation
Report/Patent Number
X-661-73-212
NASA-TM-X-70427
Accession Number
73N29824
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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