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arXiv 1504.00673astro-ph.HE
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iPTF14yb:首次发现不依赖于高能触发的GRB余辉

iPTF14yb: The First Discovery of a GRB Afterglow Independent of a High-Energy Trigger

S. Bradley Cenko, Alex L. Urban, Daniel A. Perley, Assaf Horesh, Alessandra Corsi, Derek B. Fox, Yi Cao, Mansi M. Kasliwal, Amy Lien, Iair Arcavi, Joshua S. Blo… 展开作者

S. Bradley Cenko, Alex L. Urban, Daniel A. Perley, Assaf Horesh, Alessandra Corsi, Derek B. Fox, Yi Cao, Mansi M. Kasliwal, Amy Lien, Iair Arcavi, Joshua S. Bloom, Nat R. Butler, Antonino Cucchiara, Jose A. de Diego, Alexei V. Filippenko, Avishay Gal-Yam, Neil Gehrels, Leonid Georgiev, J. Jesus Gonzalez, John F. Graham, Jochen Greiner, D. Alexander Kann, Christopher R. Klein, Fabian Knust, S. R. Kulkarni, Alexander Kutyrev, Russ Laher, William H. Lee, Peter E. Nugent, J. Xavier Prochaska, Enrico Ramirez-Ruiz, Michael G. Richer, Adam Rubin, Yuji Urata, Karla Varela, Alan M. Watson, Przemek R. Wozniak

摘要:

我们在这里报告的发现,由中间帕洛玛瞬态工厂(iPTF)的iPTF 14 Yb,发光($M_{r}\approx-27.8$马格),宇宙学(红移1.9733),迅速衰落的光学瞬态。我们证明,基于概率参数和更广泛的人口比较,iPTF 14 Yb是光学余辉的长时间伽马射线暴GRB 140226 A。这标志着第一次明确发现伽玛射线暴余辉之前(因此完全独立于)相关的高能量触发。我们估计iPTF 14 yb样源的比率(即,宇宙学上遥远的相对论爆炸),基于iPTF观测,推断出$\Re_{\mathrm{rel}}=610$ yr $^{-1}$的全天值(68%置信区间为110-2000 yr $^{-1}$)。我们推导出的速率是一致的(在很大的不确定性)与全天空率的轴上伽玛暴的雨燕卫星。最后,我们简要讨论了迄今为止未探测到真正的“孤儿”余辉的影响(即,那些缺乏可检测的高能量发射)对伽玛射线暴聚束和这些相对论性喷流中重子负载的程度。

英文摘要:

We report here the discovery by the Intermediate Palomar Transient Factory (iPTF) of iPTF14yb, a luminous ($M_{r}\approx-27.8$ mag), cosmological (redshift 1.9733), rapidly fading optical transient. We demonstrate, based on probabilistic arguments and a comparison with the broader population, that iPTF14yb is the optical afterglow of the long-duration gamma-ray burst GRB 140226A. This marks the first unambiguous discovery of a GRB afterglow prior to (and thus entirely independent of) an associated high-energy trigger. We estimate the rate of iPTF14yb-like sources (i.e., cosmologically distant relativistic explosions) based on iPTF observations, inferring an all-sky value of $\Re_{\mathrm{rel}}=610$ yr$^{-1}$ (68% confidence interval of 110-2000 yr$^{-1}$). Our derived rate is consistent (within the large uncertainty) with the all-sky rate of on-axis GRBs derived by the Swift satellite. Finally, we briefly discuss the implications of the nondetection to date of bona fide "orphan" afterglows (i.e., those lacking detectable high-energy emission) on GRB beaming and the degree of baryon loading in these relativistic jets.

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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