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Evidence for an Early High-Energy Afterglow Observed with BATSE from GRB980923In this letter, we present for the first time evidence in the BATSE data for a prompt high-energy (25-300 keV) afterglow component from a Gamma-Ray Burst (GRB), GRB980923. The event ranks third highest in fluence (>25 keV) in the BATSE catalog and consists of a period of rapid variability lasting about 40 s followed by a smooth power law emission tail lasting about 400 s beyond the trigger time. An abrupt change in spectral shape is found when the tail becomes noticeable. Our analysis reveals that the spectral evolution in the tail of the burst mimics that of a cooling synchrotron spectrum, similar to the spectral evolution of the low-energy afterglows for GRBS. This evidence for a separate emission component is consistent with the internal-external shock scenario in the relativistic fireball picture. In particular, it illustrates that the external shocks can be generated during the primary gamma-ray emission phase, as in the case of GRB990123.
Document ID
19990098442
Acquisition Source
Marshall Space Flight Center
Document Type
Preprint (Draft being sent to journal)
Authors
Giblin, Tim
(Alabama Univ. Huntsville, AL United States)
vanParadijs, Jan
(Alabama Univ. Huntsville, AL United States)
Kouveliotou, Chryssa
(Universities Space Research Association Huntsville, AL United States)
Connaughton, Valerie
(National Academy of Sciences - National Research Council Huntsville, AL United States)
Wijers, Ralph A. M. J.
(State Univ. of New York Stony Brook, NY United States)
Fishman, Gerald
(NASA Marshall Space Flight Center Huntsville, AL United States)
Date Acquired
August 19, 2013
Publication Date
January 1, 1999
Subject Category
Space Radiation
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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