The rapid decline of the prompt emission in Gamma-Ray Bursts

Shlomo Dado; Arnon Dar; A. De Rujula

doi:10.1086/587952

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arXiv · 0709.4307

The rapid decline of the prompt emission in Gamma-Ray Bursts

Shlomo Dado·Arnon Dar·A. De Rujula

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Abstract

Many gamma ray bursts (GRBs) have been observed with the Burst-Alert and X-Ray telescopes of the Swift satellite. The successive `pulses' of these GRBs end with a fast decline and a fast spectral softening, until they are overtaken by another pulse, or the last pulse's decline is overtaken by a less rapidly-varying `afterglow'. The fast decline-phase has been attributed, in the currently-explored standard fireball model of GRBs, to `high-latitude' synchrotron emission from a collision of two conical shells. This high latitude emission does not explain the observed spectral softening. In contrast, the temporal behaviour and the spectral evolution during the fast-decline phase agree with the predictions of the cannonball model of GRBs.

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Shlomo Dado, Arnon Dar, A. De Rujula. 2008-01-26. The rapid decline of the prompt emission in Gamma-Ray Bursts. https://doi.org/10.1086/587952

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