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arXiv 0908.4452astro-ph.HE
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GRB090111:超软陡衰减发射和特殊的再增亮

GRB090111: extra soft steep decay emission and peculiar re-brightening

R. Margutti, T. Sakamoto, G. Chincarini, C. Guidorzi, J. Mao, F. Pasotti, D. Burrows, P. D'Avanzo, S. Campana, S. D. Barthelmy, N. Gehrels

摘要:

我们对GRB 090111进行了详细的研究,重点是在非常陡峭的衰变阶段发射(幂律指数α =5.1,比Swift探测到的96%的GRB更陡峭)时,它的超软幂律光子指数Gamma>5,以及随后的特殊X射线再增亮。我们的光谱分析支持了共动带谱的假设,其中nu*F_nu谱的峰值随时间向低值演化:当E_peak演化到能带外时,1- 2keV光变曲线中的较高时间变化的时期结束。与雨燕探测到的82个早期耀斑的均匀样本相比,X射线再增亮显示出极端的时间特性。虽然不能排除内部的起源,我们表明这些属性是一致的,在刷新的冲击所产生的能量注入慢壳碰撞最快的从后面,以及内部冲击,被认为是引起即时排放已经停止。

英文摘要:

We present a detailed study of GRB090111, focusing on its extra soft power-law photon index Gamma>5 at the very steep decay phase emission (power-law index alpha=5.1, steeper than 96% of GRBs detected by Swift) and the following peculiar X-ray re-brightening. Our spectral analysis supports the hypothesis of a comoving Band spectrum with the the peak of the nu*F_nu spectrum evolving with time to lower values: a period of higher temporal variability in the 1-2 keV light-curve ends when the E_peak evolves outside the energy band. The X-ray re-brightening shows extreme temporal properties when compared to a homogeneous sample of 82 early flares detected by Swift. While an internal origin cannot be excluded, we show these properties to be consistent with the energy injection in refreshed shocks produced by slow shells colliding with the fastest ones from behind, well after the internal shocks that are believed to give rise to the prompt emission have ceased.

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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