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
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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.
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页码：394 / 398
页数：5
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