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Time variations of an absorption feature in the spectrum of the gamma-ray burst on 1980 April 19The photon number spectrum integrated over the impulsive part of the event is shown to fit a thermal bremsstrahlung function with a temperature of 330 + or - 70 keV at energies between 151 and 487 keV. At lower energies, the data points lie considerably below this function, indicating a broad absorption feature extending down to values less than or equal to 28 keV, the lowest energy measured. The upper energy of this absorption feature varies from 100 to 150 keV on a time scale less than or equal to 0.5 s. This event is interpreted as a typical gamma ray burst, even though it is still considered remotely possible that it is of solar origin. The spectral features, together with their variability, are interpreted in terms of electron interactions at the cyclotron resonance frequency in magnetic fields of 10 to the 12th - 10 to the 13th gauss close to the surface of a neutron star.
Document ID
19830038797
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Dennis, B. R.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Frost, K. J.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Kiplinger, A. L.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Orwig, L. E.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Desai, U.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Cline, T. L.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 11, 2013
Publication Date
January 1, 1982
Subject Category
Astrophysics
Meeting Information
Meeting: Gamma ray transients and related astrophysical phenomena; Workshop
Location: La Jolla, CA
Start Date: August 5, 1981
End Date: August 8, 1981
Sponsors: U. S. Department of Energy
Accession Number
83A20015
Distribution Limits
Public
Copyright
Other

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