Journal
ASTROPHYSICAL JOURNAL
Volume 665, Issue 2, Pages L93-L96Publisher
IOP PUBLISHING LTD
DOI: 10.1086/519837
Keywords
gamma rays : bursts; hydrodynamics; radiation mechanisms : nonthermal; relativity shock; waves
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The standard model of afterglow production by the forward shock wave is not supported by recent observations. We propose a model in which the forward shock is invisible and afterglow is emitted by a long-lived reverse shock in the burst ejecta. It explains observed optical and X-ray light curves, including the plateau at 10(3)-10(4) s with a peculiar chromatic break, and the second break that was previously associated with a beaming angle of the explosion. The plateau forms following a temporary drop of the reverse-shock pressure much below the forward-shock pressure. A simplest formalism that can describe such blast waves is the mechanical model; we use it in our calculations.
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