论文标题
建模GRB 180325a的及时光学发射：尖峰从光学到伽马射线的演变
Modelling the prompt optical emission of GRB 180325A: the evolution of a spike from the optical to gamma-rays
论文作者
论文摘要
从提示到余辉发射的过渡是伽玛射线爆发（GRB）中最令人兴奋，最不知情的阶段之一。已经探索了GRB中光学，X射线和伽马射线发射之间的相关性，以尝试回答最早的光学发射是否来自内部和/或外部冲击。我们介绍了使用塔罗牌和塔罗比尔地面望远镜收集的GRB 180325a的光学光度观测。这些观察结果显示了两个强烈的光闪光，在$ \ sim50 \; $ s和$ \ sim120 \; $ s上单独的峰值，随后是时间扩展的光学发射。我们还在Neil Gehrels Swift天文台上介绍了GRB 180325a的X射线和Gamma射线观测值，该观察值是爆发警报望远镜（BAT）和X射线望远镜（XRT），它们都观察到$ \ sim80 \; $ s的狭窄闪光灯。我们表明，迅速的γ-射线和X射线早期排放共享与相对论流出内部内部耗散一致的时间和光谱特征（例如，通过内部冲击或磁重新连接），而早期的光闪光很可能是由反向震动产生的，这些反向震动会逐渐消失，因为它会扫除外部媒介。
The transition from prompt to the afterglow emission is one of the most exciting and least understood phases in gamma-ray bursts (GRBs). Correlations among optical, X-ray and gamma-ray emission in GRBs have been explored, to attempt to answer whether the earliest optical emission comes from internal and/or external shocks. We present optical photometric observations of GRB 180325A collected with the TAROT and RATIR ground-based telescopes. These observations show two strong optical flashes with separate peaks at $\sim50\;$s and $\sim120\;$s, followed by a temporally extended optical emission. We also present X-rays and gamma-ray observations of GRB 180325A, detected by the Burst Alert Telescope (BAT) and X-ray Telescope (XRT), on the Neil Gehrels Swift observatory, which both observed a narrow flash at $\sim80\;$s. We show that the prompt gamma- and X-ray early emission shares similar temporal and spectral features consistent with internal dissipation within the relativistic outflow (e.g. by internal shocks or magnetic reconnection), while the early optical flashes are likely generated by the reverse shock that decelerates the ejecta as it sweeps up the external medium.
