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High-energy spectral breaks in gamma-ray burstsModel fits are presented for 18 gamma-ray burst spectra from 100 keV to 27 MeV made with the BATSE spectroscopy detectors on the Compton Gamma Ray Observatory. Most of the bursts are well fitted as power laws with spectral indices between -1.36 and -2.29; however, five bursts show definite departures from a simple power-law fit at high energies. Three of these bursts are well fitted with broken power-law spectra and break energies of from 400 to 690 keV, such as might arise from photon-photon interactions. If so, then the source compactness and hence distance will be sharply constrained. Two of the bursts have spectra with sharply confined slope changes and are well fitted with broken power-law spectra with break energies of 1.2 and 1.6 MeV at peak, such as might arise from photon-magnetic field interactions. If so, then these spectral breaks provide strong evidence for the existence of high magnetic fields in the burst emission region.
Document ID
19920063066
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Schaefer, Bradley E.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Teegarden, Bonnard J.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Cline, Thomas L.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Fishman, Gerald J.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Meegan, Charles A.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Wilson, Robert B.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Paciesas, William S.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Pendleton, Geoffrey N.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Matteson, James L.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Band, David L.
(California, University La Jolla, United States)
Date Acquired
August 15, 2013
Publication Date
July 10, 1992
Publication Information
Publication: Astrophysical Journal, Part 2 - Letters
Volume: 393
Issue: 2, Ju
ISSN: 0004-637X
Subject Category
Space Radiation
Accession Number
92A45690
Distribution Limits
Public
Copyright
Other

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