论文标题
Fermi-Lat Grb余气光谱中通常会看到一种上流的上涨吗？
Is an upturn commonly seen in Fermi-LAT GRB afterglow spectra?
论文作者
论文摘要
我们分析了Fermi-Lat在2008 - 2019年期间检测到的199个GRB。我们在能量> = 10 GEV处发现了67个光子，来自34个GRB。在这34个GRB中，Fermi-Lat检测到25 GRB的显着（Ts> = 4）余泽0.1-200 GEV光子。我们提出了这25个GRB的时间集成为0.1-200 GEV光谱。这些GRB的显着部分（9/25）的光谱显示出在0.3-2 GEV的能量断裂以上的硬分量。虽然冲击同步加速器可能会解释较低能量端处的光子，但高于断裂上方的高能光子自然可以通过同步加速器自compton（SSC）发射来解释。我们对GRB 131231a的X射线LAT发射进行宽带模型。将这25个GRB的余辉光谱与检测到的其他Fermi-LAT检测到的GRB进行比较，我们发现两个人群的幂律指数分布相似。这可能表明，通常在费米 - 拉特GRB中也可能存在附加的高能量成分。
We analyzed 199 GRBs detected by Fermi-LAT during the years 2008-2019. We found 67 photons at energies >=10 GeV, which come from 34 GRBs. Out of these 34 GRBs, Fermi-LAT detects significant (TS>=4) afterglow 0.1-200 GeV photons from 25 GRBs. We present time-integrated 0.1-200 GeV spectra of these 25 GRBs. The spectra of a significant fraction (9/25) of these GRBs revealed a harder component above an energy break of 0.3-2 GeV. While shock synchrotron may account for the photons at the lower energy end, high energy photons above the break is naturally explained by synchrotron self-Compton (SSC) emission. We perform broadband model fit to the X-ray-LAT emission of GRB 131231A. Comparing the afterglow spectra of these 25 GRBs with other Fermi-LAT detected GRBs, we found that the power-law index distribution is similar for the two populations. This may indicate that the additional high-energy component may also exist in Fermi-LAT GRBs in general.
