Are All Gamma-Ray Bursts Like GRB 980425, GRB 030329, and GRB 031203?
Are All Gamma-Ray Bursts Like GRB 980425, GRB 030329, and GRB 031203?
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DOI：
10.1086/426136
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发表时间：
2004-09
期刊：
影响因子：
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通讯作者：
D. Guetta;R. Perna;L. Stella;M. Vietri
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作者：
D. Guetta;R. Perna;L. Stella;M. Vietri
我们研究了在红移\(z = 0.17\)范围内发现三个伽马射线暴（980425、030329、031203）的概率，给定的光度函数要与经典宇宙学爆发（即那些由BATSE观测到的）的\(\log N - \log S\)关系相一致。我们表明，为了使这三个低红移事件的概率不可忽略（从而使它们更有可能属于经典宇宙学爆发的同一类别），爆发的光度函数必须是一个折断幂律。通过与成束的活动星系核进行类比推理，我们表明如果伽马射线暴980425和伽马射线暴031203确实是侧向观测到的正常爆发，那么观测结果与预期是一致的。在这个模型中，在接下来的约20年里，类似高能暂现源探测器的仪器不应在\(z = 0.17\)范围内观测到明亮的爆发。
We study the probability that three GRBs (980425, 030329, 031203) are found within z = 0.17, given the luminosity functions consistent with the log N-log S relationship for classical cosmological bursts (i.e., those observed by BATSE). We show that, in order for the probability of these three low-z events to be nonnegligible (thus making it more likely that they belong to the same class of the classical cosmological bursts), the bursts' luminosity function must be a broken power law. By reasoning in analogy with beamed active galactic nuclei, we show that observations are consistent with the expectations if GRB 980425 and GRB 031203 are indeed normal bursts seen sideways. Within this model, no bright burst within z = 0.17 should be observed by a High Energy Transient Explorer-like instrument within the next ~20 yr.