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T. Giblin, J. Hakkila (The College of Charleston)
We examine the spectral properties of quiescent Gamma-Ray Bursts (GRB) in the BATSE catalog. Quiescent GRBs are multi-episodic bursts whose emission drops below the background level for some period of time that is comparable to the duration of the emission episode, followed by a resurgence of emission. A careful inspection of late times in GRB light curves, after the GRB has presumably ended, reveals some instances of additional emission. This "post-quiescent" emission may have one of two possible origins in the internal/external shock model: (1)it is the result of internal shocks from delayed activity in the progenitor, or (2)it is the onset of the afterglow. We investigate this hypothesis by comparing the spectral properties of the post-quiescent episode to that of the pre-quiescent episode and to that of typical single-episode GRBs.
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Bulletin of the American Astronomical Society,
© 2003. The American Astronomical Soceity.