Evidence for postquiescent, high-energy emission from gamma-ray burst 990104

被引：0

作者：

Wren, DN ^{[1
]}

Bertsch, DL

Ritz, S

机构：

[1] Univ Maryland, Dept Phys, Greenbelt, MD 20771 USA

[2] NASA, Goddard Space Flight Ctr, High Energy Astrophys Lab, Greenbelt, MD 20771 USA

来源：

ASTROPHYSICAL JOURNAL | 2002年 / 574卷 / 01期

关键词：

gamma rays : bursts; gamma rays : observations;

D O I：

暂无

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

It is well known that high-energy emission (MeV-GeV) has been observed in a number of gamma-ray bursts, and temporally extended emission from lower energy gamma rays through radio wavelengths is well established. An important observed characteristic of some bursts at low energy is quiescence: an initial emission followed by a quiet period before a second (postquiescent) emission. Evidence for significant high-energy, postquiescent emission has been lacking. Here we present evidence for high-energy emission, coincident with lower energy emission, from the postquiescent emission episode of the very bright and long burst, GRB 990104. We show light curves and spectra that confirm emission above 50 MeV, approximately 152 s after the BATSE trigger and initial emission episode. Between the initial emission episode and the main peak, seen at both low and high energy, there was a quiescent period of similar to100 s during which the burst was relatively quiet. This burst was found as part of an ongoing search for high-energy emission in gamma-ray bursts using the EGRET fixed interval (32 s) accumulation spectra, which provide sensitivity to later, high-energy emission that is otherwise missed by the standard EGRET BATSE-triggered burst spectra.

引用

页码：L47 / L50

页数：4

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