论文标题
GRB 210121A：观察来自不同政权的光电排放和流出的演变
GRB 210121A: Observation of photospheric emissions from different regimes and the evolution of the outflow
论文作者
论文摘要
GRB 210121a通过Insight-HxMT观察到，引力波高能电磁对应物全套监测器（GECAM），Fermi Gamma-ray爆发监视器（Fermi/GBM）在2021年1月21日。轴上。特别是，在及时发射的前1.3 s中首先观察到中间光球的发射，而另一部分的发射则在饱和度方案中占主导地位，并且与先前的工作相比提供了另一种解释。此外，考虑中间光球可以很好地解释脉冲过程中低能光子指数$α$的变化。此外，从时间分辨分析中提取流出的演变，并且获得了$γ_0\ propto l^{0.25 \ pm0.05} _0 $的相关性，这意味着该飞机可能主要由Hyper-Ecccretion Disk中的中ni灭发射。
GRB 210121A was observed by Insight-HXMT, Gravitational wave high-energy Electromagnetic Counterpart All-sky Monitor (GECAM), Fermi Gamma-ray Burst Monitor (Fermi/GBM) on Jan 21st 2021. In this work, photospheric emission from a structured jet is preferred to interpret the prompt emission phase of GRB 210121A and emissions from different regimes are observed on-axis. Particularly, the emission from the intermediate photosphere is first observed in the first 1.3 s of the prompt emission, while those from the other part are dominant by the saturated regime, and offers an alternative explanation compared with the previous work. Moreover, the emissions with considering the intermediate photosphere can well interpret the changes on low-energy photon index $α$ during the pulses. Besides, the evolution of the outflow is extracted from time-resolved analysis, and a correlation of $Γ_0 \propto L^{0.25\pm0.05}_0$ is obtained, which implies that the jet may be mainly launched by neutrino annihilation in a hyper-accretion disk.
