The sub-energetic γ-ray burst GRB 031203 as a cosmic analogue to the nearby GRB 980425
The sub-energetic γ-ray burst GRB 031203 as a cosmic analogue to the nearby GRB 980425
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DOI：
10.1038/nature02757
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发表时间：
2004-08
期刊：
影响因子：
64.8
通讯作者：
A. Soderberg;S. Kulkarni;Edo Berger;D. Fox;Masao Sako;D. Frail;A. Gal-yam;D. Moon;S. Cenko;S. Yost;M. M. Phillips-M.;S. E. Persson;W. Freedman;P. Wyatt;R. Jayawardhana;D. Paulson
中科院分区：
文献类型：
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作者：
A. Soderberg;S. Kulkarni;Edo Berger;D. Fox;Masao Sako;D. Frail;A. Gal-yam;D. Moon;S. Cenko;S. Yost;M. M. Phillips-M.;S. E. Persson;W. Freedman;P. Wyatt;R. Jayawardhana;D. Paulson
自从发现GRB 980425的γ射线暴以来的六年里，天文学家们一直在激烈地争论这一事件的性质。相对于位于宇宙学距离（红移1）的爆发，GRB 980425在γ射线中的亮度不足三个数量级。无线电量热仪显示，爆炸是次能量的10倍。在这里，我们报告的观测无线电和X射线余辉的最近GRB 031203（参考文献），它有一个红移z = 0.105。我们证明它也是次高能的，当与低γ射线光度一起考虑时，表明GRB 031203是GRB 980425的第一个宇宙类似物。我们没有发现任何证据表明，这一事件是一个高度准直爆炸离轴观看。像GRB 980425一样，GRB 031203似乎是一个本质上的亚能量γ射线爆发。这种次能量事件有微弱的余辉。我们希望对具有平滑γ射线光变曲线的微弱爆发（GRB 031203和980425共同）进行深入的跟踪，以揭示大量此类事件。
Over the six years since the discovery of the γ-ray burst GRB 980425, which was associated with the nearby (distance ∼40 Mpc) supernova 1998bw, astronomers have debated fiercely the nature of this event. Relative to bursts located at cosmological distance (redshiftz≈ 1), GRB 980425 was under-luminous in γ-rays by three orders of magnitude. Radio calorimetry,showed that the explosion was sub-energetic by a factor of 10. Here we report observations of the radio and X-ray afterglow of the recent GRB 031203 (refs ), which has a redshift ofz= 0.105. We demonstrate that it too is sub-energetic which, when taken together with the low γ-ray luminosity, suggests that GRB 031203 is the first cosmic analogue to GRB 980425. We find no evidence that this event was a highly collimated explosion viewed off-axis. Like GRB 980425, GRB 031203 appears to be an intrinsically sub-energetic γ-ray burst. Such sub-energetic events have faint afterglows. We expect intensive follow-up of faint bursts with smooth γ-ray light curves,(common to both GRB 031203 and 980425) to reveal a large population of such events.