Margutti 2009 GRB090111的观测

主要内容:
谱非常软, 光子谱指数都到了5! 另外还有一个X射线的flare.

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Title:		GRB090111: extra soft steep decay emission and peculiar re-brightening
Authors:		Margutti, R.; Sakamoto, T.; Chincarini, G.; Guidorzi, C.; Mao, J.; Pasotti, F.; Burrows, D.;D'Avanzo, P.; Campana, S.; Barthelmy, S. D.; Gehrels, N.
Publication:		eprint arXiv:0908.4452
Publication Date:		08/2009
Origin:		ARXIV
Keywords:		Astrophysics - High Energy Astrophysical Phenomena
Comment:		Accepted for publication by MNRAS
Bibliographic Code:		2009arXiv0908.4452M

Abstract

We present a detailed study of GRB090111, focusing on its extra soft power-law photon index Gamma>5 at the very steep decay phase emission (power-law index alpha=5.1, steeper than 96% of GRBs detected by Swift) and the following peculiar X-ray re-brightening. Our spectral analysis supports the hypothesis of a comoving Band spectrum with the the peak of the nu*F_nu spectrum evolving with time to lower values: a period of higher temporal variability in the 1-2 keV light-curve ends when the E_peak evolves outside the energy band. The X-ray re-brightening shows extreme temporal properties when compared to a homogeneous sample of 82 early flares detected by Swift. While an internal origin cannot be excluded, we show these properties to be consistent with the energy injection in refreshed shocks produced by slow shells colliding with the fastest ones from behind, well after the internal shocks that are believed to give rise to the prompt emission have ceased.

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