GRB 990123: The optical flash and the fireball model

被引:331
作者
Sari, R
Piran, T
机构
[1] CALTECH, Pasadena, CA 91125 USA
[2] Hebrew Univ Jerusalem, Racah Inst Phys, IL-91904 Jerusalem, Israel
[3] Columbia Univ, Dept Phys, New York, NY 10027 USA
基金
美国国家航空航天局;
关键词
gamma rays : bursts; hydrodynamics; relativity; shock waves;
D O I
10.1086/312039
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We show that the ongoing observations of the remarkable burst GRB 990123 agree with the predictions of the fireball model. Specifically, the observations confirm the recent prediction that the reverse shock propagating into the ejecta would produce a very strong prompt optical flash. This reverse shock has also produced the 8.46 GHz radio signal, observed after 1 day. The forward shock, which is the origin of the classical afterglow, has produced the prompt X-ray signal as well as the late optical and IR emission. The observations suggest that the initial Lorentz factor of the ejecta was similar to 200. Within factors of order unity, this crude model explains all current observations of GRB 990123.
引用
收藏
页码:L109 / L112
页数:4
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