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arXiv 1602.04158astro-ph.HE
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GRB 130427 A X射线余辉的80 Ms跟踪对标准前向激波模型提出了挑战

The 80 Ms follow-up of the X-ray afterglow of GRB 130427A challenges the standard forward shock model

M. De Pasquale, M. J. Page, D. A. Kann, S. R. Oates, S. Schulze, B. Zhang, Z. Cano, B. Gendre, D. Malesani, A. Rossi, E. Troja, L. Piro, M. Boër, G. Stratta, N. Gehrels

摘要:

GRB 130427 A是过去30年来探测到的最明亮的伽马射线暴。它的等效各向同性能量输出为$8.5\times10^{53}$ erg,红移为$z=0.34$,独特地将非常高的能量与相对接近地球结合在一起。因此,它的X射线余辉已经被灵敏的X射线天文台如XMM-牛顿和钱德拉探测到,其基线时间超过8000万秒。我们给出了这一事件在这样一段时间内的X射线光变曲线。光变曲线显示了一个简单的幂律衰减,斜率为$α= 1.309 \pm 0.007$,时间超过30年(47 ks - 83 Ms)。我们讨论了这一结果的后果,到目前为止提出的几个模型来解释GRB 130427 A,更一般的意义,这一结果的背景下,标准的前向冲击模型。我们发现,这个模型很难解释我们的数据,在这两种情况下的恒定密度和恒星风环暴介质,并需要牵强的值所涉及的物理参数。

英文摘要:

GRB 130427A was the brightest gamma-ray burst detected in the last 30 years. With an equivalent isotropic energy output of $8.5\times10^{53}$ erg and redshift $z=0.34$, it uniquely combined very high energetics with a relative proximity to Earth. As a consequence, its X-ray afterglow has been detected by sensitive X-ray observatories such as XMM-Newton and Chandra for a record-breaking baseline longer than 80 million seconds. We present the X-ray light-curve of this event over such an interval. The light-curve shows a simple power-law decay with a slope $α= 1.309 \pm 0.007$ over more than three decades in time (47 ks - 83 Ms). We discuss the consequences of this result for a few models proposed so far to interpret GRB 130427A, and more in general the significance of this outcome in the context of the standard forward shock model. We find that this model has difficulty in explaining our data, in both cases of constant density and stellar wind circumburst media, and requires far-fetched values for the physical parameters involved.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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