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arXiv 0708.1383astro-ph
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GRB 070311:即时发射和余辉之间的直接联系

GRB 070311: a direct link between the prompt emission and the afterglow

C. Guidorzi, S. D. Vergani, S. Sazonov, S. Covino, D. Malesani, S. Molkov, E. Palazzi, P. Romano, S. Campana, G. Chincarini, D. Fugazza, A. Moretti, G. Tagliafe… 展开作者

C. Guidorzi, S. D. Vergani, S. Sazonov, S. Covino, D. Malesani, S. Molkov, E. Palazzi, P. Romano, S. Campana, G. Chincarini, D. Fugazza, A. Moretti, G. Tagliaferri, A. Llorente, J. Gorosabel, L. A. Antonelli, M. Capalbi, G. Cusumano, P. D'Avanzo, V. Mangano, N. Masetti, E. Meurs, T. Mineo, E. Molinari, D. C. Morris, L. Nicastro, K. L. Page, M. Perri, B. Sbarufatti, G. Stratta, R. Sunyaev, E. Troja, F. M. Zerbi

摘要:

本文对INTEGRAL发现的GRB 070311进行了瞬发γ射线、早期近红外/光学、晚期光学和X射线观测,以获得有关GRB 070311瞬发γ射线脉冲以及早期和晚期多波段余辉机制的线索。我们用经验函数拟合了伽马射线和光学光变曲线,并将结果缩放到晚期X射线。REM拍摄的H波段光变曲线显示了两个脉冲,峰值分别在伽马射线暴峰值之后的80和140秒,可能伴随着微弱的伽玛射线尾。值得注意的是,在爆发后的3 × 10 ^4 ~ 2 × 10 ^5 s之间,后期的光学余辉和X射线余辉经历了一次主要的再增亮,其X射线通量与在同一波段外推的瞬发辐射相当。值得注意的是,后期再亮的时间分布可以被描述为即时伽马射线脉冲的时间重新缩放版本和潜在的幂律的组合。这一结果支持一个共同的起源,即时和晚X射线/光学余辉再亮的GRB 070311内的外部冲击的情况。主火球将负责迅速发射,而第二个炮弹将在刷新冲击波中撞击领先的冲击波时产生重新亮化(删节)。

英文摘要:

We present prompt gamma-ray, early NIR/optical, late optical and X-ray observations of the peculiar GRB 070311 discovered by INTEGRAL, in order to gain clues on the mechanisms responsible for the prompt gamma-ray pulse as well as for the early and late multi-band afterglow of GRB 070311. We fitted with empirical functions the gamma-ray and optical light curves and scaled the result to the late time X-rays. The H-band light curve taken by REM shows two pulses peaking 80 and 140 s after the peak of the gamma-ray burst and possibly accompanied by a faint gamma-ray tail. Remarkably, the late optical and X-ray afterglow underwent a major rebrightening between 3x10^4 and 2x10^5 s after the burst with an X-ray fluence comparable with that of the prompt emission extrapolated in the same band. Notably, the time profile of the late rebrightening can be described as the combination of a time-rescaled version of the prompt gamma-ray pulse and an underlying power law. This result supports a common origin for both prompt and late X-ray/optical afterglow rebrightening of GRB 070311 within the external shock scenario. The main fireball would be responsible for the prompt emission, while a second shell would produce the rebrightening when impacting the leading blastwave in a refreshed shock (abridged).

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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