Possible detection of hard X-ray afterglows of short γ-ray bursts

被引：91

作者：

Lazzati, D

Ramirez-Ruiz, E

Ghisellini, G

机构：

[1] Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England

[2] Osserv Astron Brera, I-23807 Merate, Italy

来源：

ASTRONOMY & ASTROPHYSICS | 2001年 / 379卷 / 03期

关键词：

gamma rays : bursts; radiation mechanisms : non-thermal;

D O I：

10.1051/0004-6361:20011485

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the discovery of a transient and fading hard X-ray emission in the BATSE lightcurves of a sample of short gamma -ray bursts. We have summed each of the four channel BATSE light curves of 76 short bursts to uncover the average overall temporal and spectral evolution of a possible transient signal following the prompt flux. We found an excess emission peaking similar to 30 s after the prompt one, detectable for approximate to 100 s. The soft power-law spectrum and the time-evolution of this transient signal suggest that it is produced by the deceleration of a relativistic expanding source, as predicted by the afterglow model.

引用

页码：L39 / L43

页数：5

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