Evidence for early high-energy afterglow: BATSE observations of GRB980923

被引：0

作者：

Giblin, TW ^{[1
]}

van Paradijs, J ^{[1
]}

Kouveliotou, C ^{[1
]}

Connaughton, V ^{[1
]}

Wijers, RAMJ ^{[1
]}

Briggs, MS ^{[1
]}

Preece, RD ^{[1
]}

Fishman, GJ ^{[1
]}

机构：

[1] Univ Alabama, Dept Phys, Huntsville, AL 35899 USA

来源：

GAMMA-RAY BURSTS | 2000年 / 526卷

关键词：

D O I：

暂无

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The relation between the prompt gamma -ray emission of a Gamma-Ray Burst (GRB) and its afterglow emission is unclear. We present evidence in the BATSE data for a prompt high-energy (25-300 keV) afterglow component associated with GRB980923 that is initiated during the burst. The event exhibits rapid variability lasting similar to 40 s, followed by a smooth power-law emission tail lasting similar to 400 s. The energy spectrum changes abruptly to a cooling synchrotron spectrum when the tail becomes noticeable, consistent with the internal-external shock scenario in the fireball model. This overlap of prompt and afterglow emission illustrates that the external shocks can be generated during the gamma -ray emission phase, as also suggested by the simultaneous optical emission of GRB991023.

引用

页码：394 / 398

页数：5

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