GRB 071112 C和GRB 080506中X射线耀斑的红外/光学X射线同时观测
Infrared/optical - X-ray simultaneous observations of X-ray flares in GRB 071112C and GRB 080506
摘要：
本文研究了在伽马射线暴余辉早期偶尔观测到的短X射线耀斑的起源。我们观察到两个事件，GRB 071112 C和GRB 080506，在光学和近红外（NIR）波段的X射线耀斑开始之前，与1.5米Kanata望远镜。结合已发表的X射线和光学数据，我们分析了密集采样的光曲线的早期余辉和光谱能量分布（SED）在近红外X射线范围。我们发现，无论伽玛暴宿主星系的星际消光校正模型如何，在两个伽玛暴的正常衰变阶段，SED在光学和X射线波段之间都有一个断裂。在X射线耀斑中，GRB 071112 C和080506的X射线通量分别增加了3倍和15倍，并且X射线谱变得比正常衰变阶段的谱更硬。光学近红外范围与X射线耀斑一起未检测到显著变化。这些结果表明，X射线耀斑与后期的内部冲击或外部冲击的两个组成部分喷流。
英文摘要：
We investigate the origin of short X-ray flares which are occasionally observed in early stages of afterglows of gamma-ray bursts (GRBs). We observed two events, GRB 071112C and GRB 080506, before the start of X-ray flares in the optical and near-infrared (NIR) bands with the 1.5-m Kanata telescope. In conjunction with published X-ray and optical data, we analyzed densely sampled light curves of the early afterglows and spectral energy distributions (SEDs) in the NIR-X-ray ranges. We found that the SEDs had a break between the optical and X-ray bands in the normal decay phases of both GRBs regardless of the model for the correction of the interstellar extinction in host galaxies of GRBs. In the X-ray flares, X-ray flux increased by 3 and 15 times in the case of GRB 071112C and 080506, respectively, and the X-ray spectra became harder than those in the normal decay phases. No significant variation in the optical-NIR range was detected together with the X-ray flares. These results suggest that the X-ray flares were associated with either late internal shocks or external shocks from two-component jets.
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