论文标题
使用费米和ASIM观察到的发光GRB 210619b的多波长研究
Multi-wavelength study of the luminous GRB 210619B observed with Fermi and ASIM
论文作者
论文摘要
我们报告了在国际空间站（ISS）（ISS）上安装的大气空间交互监视器（ASIM）检测到的非常明亮和长的GRB 210619b的详细多波长观察结果和分析，并分析了FERMI任务。我们的主要目标是了解GRB 210619b的辐射机制和喷气组成。随着$ z $ = 1.937的测量红移，我们发现GRB 210619B属于迄今为止Fermi观察到的10个最发光的爆发。 GRB 210619B的能量分辨迅速光曲线表现出非常明亮的硬发射脉冲，然后表现出较软/更长的发射脉冲。使用时间分辨的频谱分析获得的低能光子指数（$α_ {\ rm pt} $）值对爆发的频谱分析获得，这表明热（在更坚硬的脉冲）向非热（较软脉冲）流出的热量（在较硬的脉冲期间）之间存在过渡。我们检查了光谱参数之间的相关性，并发现峰值能量和$α_ {\ rm pt} $都表现出通量跟踪模式。 The late time broadband photometric dataset can be explained within the framework of the external forward shock model with $ν_m$ $< ν_c$ $< ν_{x}$ (where $ν_m$, $ν_c$, and $ν_{x}$ are the synchrotron peak, cooling-break, and X-ray frequencies, respectively) spectral regime supporting a rarely observed hard electron energy索引（$ p <$ 2）。我们发现，对于小麦哲伦云（SMC）灭绝法，E（b-v）= 0.14 $ \ pm $ 0.01 mag的宿主灭绝值中等值。此外，我们还报告了晚期光学观察结果，10.4 m GTC为主机银河带来了深层的上限（$ z $ = 1.937），偏爱爆发的微弱的矮人主机。
We report on detailed multi-wavelength observations and analysis of the very bright and long GRB 210619B, detected by the Atmosphere-Space Interactions Monitor (ASIM) installed on the International Space Station (ISS) and the Gamma-ray Burst Monitor (GBM) on-board the Fermi mission. Our main goal is to understand the radiation mechanisms and jet composition of GRB 210619B. With a measured redshift of $z$ = 1.937, we find that GRB 210619B falls within the 10 most luminous bursts observed by Fermi so far. The energy-resolved prompt emission light curve of GRB 210619B exhibits an extremely bright hard emission pulse followed by softer/longer emission pulses. The low-energy photon indices ($α_{\rm pt}$) values obtained using the time-resolved spectral analysis of the burst suggest a transition between the thermal (during harder pulse) to non-thermal (during softer pulse) outflow. We examine the correlation between spectral parameters and find that both peak energy and $α_{\rm pt}$ exhibit the flux tracking pattern. The late time broadband photometric dataset can be explained within the framework of the external forward shock model with $ν_m$ $< ν_c$ $< ν_{x}$ (where $ν_m$, $ν_c$, and $ν_{x}$ are the synchrotron peak, cooling-break, and X-ray frequencies, respectively) spectral regime supporting a rarely observed hard electron energy index ($p<$ 2). We find moderate values of host extinction of E(B-V) = 0.14 $\pm$ 0.01 mag for the Small Magellanic Cloud (SMC) extinction law. In addition, we also report late-time optical observations with the 10.4 m GTC placing deep upper limits for the host galaxy ($z$=1.937), favouring a faint, dwarf host for the burst.
