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arXiv 1111.6484astro-ph.HE
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GRB 081029:一个具有多分量余辉的伽马射线暴

GRB 081029: A Gamma-Ray Burst with a Multi-Component Afterglow

Stephen T. Holland, Massimiliano De Pasquale, Jirong Mao, Takanori Sakamoto, Patricia Schady, Stefano Covino, Yi-Zhong Fan, Zhi Ping Jin, Paolo D'Avanzo, Angelo… 展开作者

Stephen T. Holland, Massimiliano De Pasquale, Jirong Mao, Takanori Sakamoto, Patricia Schady, Stefano Covino, Yi-Zhong Fan, Zhi Ping Jin, Paolo D'Avanzo, Angelo Antonelli, Valerio D'Elia, Guido Chincarini, Fabrizio Fiore, Shashi Bhushan Pandey, Bethany E. Cobb

摘要:

我们提出了一个不寻常的光学光变曲线的伽马射线暴GRB 081029,一个长期的软爆与红移z = 3.8479的分析。我们结合X射线和光学观测从雨燕X射线望远镜和雨燕紫外线/光学望远镜与地面的光学和红外数据获得的REM,ROTSE和CTIO 1.3米望远镜构建一个详细的数据集,从86秒延伸到大约100,000秒后的BAT触发。我们的数据涵盖了从10 keV到0.77 eV(1.24到16,000埃)的宽能量范围。X射线余辉显示了一个浅的初始衰变,然后是一个快速的衰变,开始于大约18,000 s。然而,光学和红外余辉在约3000 s处显示出不典型的上升,其不对应于X射线光变曲线中的任何特征。我们的数据是不一致的同步辐射从一个喷流与外部介质相互作用,一个双组分喷流,或连续的能量注入从中央引擎。我们发现,光学光变曲线可以广泛地解释由两个喷出物壳内的两个组件喷流之间的碰撞。越来越多的伽马射线暴余辉与复杂的喷流相一致,这表明一些(或所有)伽马射线暴喷流是复杂的,需要详细的建模才能完全理解它们。

英文摘要:

We present an analysis of the unusual optical light curve of the gamma-ray burst GRB 081029, a long-soft burst with a redshift of z = 3.8479. We combine X-ray and optical observations from the Swift X-Ray Telescope and the Swift UltraViolet/Optical Telescope with ground-based optical and infrared data obtained using the REM, ROTSE, and CTIO 1.3-m telescopes to construct a detailed data set extending from 86 s to approximately 100,000 s after the BAT trigger. Our data cover a wide energy range, from 10 keV to 0.77 eV (1.24 to 16,000 Angstrom). The X-ray afterglow shows a shallow initial decay followed by a rapid decay starting at about 18,000 s. The optical and infrared afterglow, however, shows an uncharacteristic rise at about 3000 s that does not correspond to any feature in the X-ray light curve. Our data are not consistent with synchrotron radiation from a jet interacting with an external medium, a two-component jet, or continuous energy injection from the central engine. We find that the optical light curves can be broadly explained by a collision between two ejecta shells within a two-component jet. A growing number of gamma-ray burst afterglows are consistent with complex jets, which suggests that some (or all) gamma-ray burst jets are complex and will require detailed modelling to fully understand them.

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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