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Observations of cosmic gamma-ray bursts with IMP-7: Evidence for a single spectrumSpectral observation of nine recent cosmic gamma-ray bursts are reported. The average photon number spectra of all nine events are shown to be consistent with a 150-keV exponential from 100 keV to about 400 keV, and a power law of index -2.5 from 400 keV to 1100 keV. The observations also indicate an event rate of 16 in 1972 and 1973, or 8 + or - 2 per year, higher than the 5 + or - 1 per year initially reported. This corresponds to an approximately 40-percent lower effective intensity threshold, attained by using more sensitive detectors in multiple-satellite coincidence.
Document ID
19750003816
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)
Date Acquired
September 3, 2013
Publication Date
September 1, 1974
Subject Category
Space Radiation
Report/Patent Number
X-661-74-296
NASA-TM-X-70778
Accession Number
75N11888
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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