Nissim Fraija, M. Magdalena Gonzalez, Willian H. Lee
GRB 980923 was one of the brightest bursts observed by the Burst and
Transient Source Experiment (BATSE). Previous studies have detected two
distinct components in addition to the main prompt episode, which is well
described by a Band function. The first of these is a tail with a duration of
approx. 400s, while the second is a high-energy component lasting approx. 2s.
We summarize the observations, and argue for a unified model in which the tail
can be understood as the early gamma-ray afterglow from forward shock
synchrotron emission, while the high-energy component arises from synchrotron
self-Comtpon (SSC) from the reverse shock. Consistency between the main
assumption of thick shell emission and agreement between the observed and
computed values for fluxes, break energies, starting times and spectral indices
leads to a requirement that the ejecta be highly magnetized.
View original:
http://arxiv.org/abs/1201.3689
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