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arXiv 1202.6440astro-ph.HE
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高能Fermi/LAT GRB100414A:能量和关联

Energetic Fermi/LAT GRB100414A: Energetic and Correlations

Yuji Urata, Kuiyun Huang, Kazutaka Yamaoka, Patrick P. Tsai, Makoto S. Tashiro

摘要:

这项研究提出了多波长的观测结果,高能GRB 100414 A与GeV的光子。使用朱雀/WAM数据进行的快速光谱拟合产生了E^src_peak的光谱峰值能量为1458.7(+132.6,-106.6)keV,Eiso为34.5(+2.0,-1.8)x 10^52 erg,z=1.368。根据时间指数α =-2.6 +/- 0.1的简单幂律,有效地拟合了3至7天之间的光学余辉光变曲线。与早期Swift/UVOT观测的联合光变曲线在2.3 +/- 0.2天处产生了一个时间中断。这是\fermi /LAT探测到的第一个事件,证明了光学余辉中的明显时间中断。从这个时间中断得到的喷流张开角为5.8度,与其他观测良好的长伽马射线暴(GRB)的喷流张开角一致。本研究中的多波长分析表明,GRB 100414 A遵循E^src_peak-Eiso和E^src_peak-E_gamma相关性。晚余辉揭示了一个平坦的演变与显着过剩在27.2天。对这种过剩最直接的解释是GRB 100414 A伴随着一颗同时代的超新星。基于其他GRB-SN事件的模型光变曲线与观察到的光变曲线略有一致。

英文摘要:

This study presents multi-wavelength observational results for energetic GRB100414A with GeV photons. The prompt spectral fitting using Suzaku/WAM data yielded spectral peak energies of E^src_peak of 1458.7 (+132.6, -106.6) keV and Eiso of 34.5(+2.0, -1.8) x 10^52 erg with z=1.368. The optical afterglow light curves between 3 and 7 days were effectively fitted according to a simple power law with a temporal index of alpha=-2.6 +/- 0.1. The joint light curve with earlier Swift/UVOT observations yields a temporal break at 2.3 +/- 0.2 days. This was the first \fermi/LAT detected event that demonstrated the clear temporal break in the optical afterglow. The jet opening angle derived from this temporal break was 5.8 degree, consistent with those of other well-observed long gamma-ray bursts (GRBs). The multi-wavelength analyses in this study showed that GRB100414A follows E^src_peak-Eiso and E^src_peak-E_gamma correlations. The late afterglow revealed a flatter evolution with significant excesses at 27.2 days. The most straightforward explanation for the excess is that GRB100414A was accompanied by a contemporaneous supernova. The model light curve based on other GRB-SN events is marginally consistent with that of the observed lightcurve.

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