No radio afterglow from the gamma-ray burst of 1997 February 28

被引:12
作者
Frail, DA [1 ]
Kulkarni, SR
Shepherd, DS
Waxman, E
机构
[1] Natl Radio Astron Observ, Socorro, NM 87801 USA
[2] CALTECH, Div Phys Math & Astron 105 24, Pasadena, CA 91125 USA
[3] Inst Adv Study, Princeton, NJ 08540 USA
基金
美国国家科学基金会; 美国国家航空航天局;
关键词
gamma rays : bursts; radio continuum : general;
D O I
10.1086/311505
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present radio observations of the gamma-ray burster GRB 970228 made with the Very Large Array and the Owens Valley Radio Observatory which span a range of postburst timescales from 1 to 300 days. A search for a time-variable radio source was conducted covering an area that included a fading X-ray source and an optical transient, both of which are thought to be the long-wavelength counterparts to the gamma-ray burst. At the position of the optical transient, sensitive limits between 10 mu Jy and 1 mJy can be placed on the absence of a radio counterpart to GRB 970228 between 1.4 and 240 GHz. We apply a simple formulation of a fireball model which has been used with some success to reproduce the behavior of the optical and X-ray light curves. Using this model, we conclude that the radio nondetections are consistent with the peak flux density of the afterglow lying between 20 and 40 mu Jy, and it requires that the optical flux peaked between 4 and 16 hr after the burst.
引用
收藏
页码:L119 / L122
页数:4
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