论文标题
GRB 190919b：快速光学上升被解释为爆炸活动
GRB 190919B: Rapid optical rise explained as a flaring activity
论文作者
论文摘要
在通过积分（国际伽马射线天体物理学实验室）检测到长GRB 190919b之后，我们获得了其光学的光度序列的光学对应物。初始触发后，光发射的光曲线表现出异常陡峭的升高〜100 s。从“规范”的GRB光学余辉中不会期望这种行为。作为解释，我们提出了一个由两个叠加耀斑组成的场景：一种源自内部发动机活动的光耀斑，然后是外部冲击的流体动力峰。第一个脉冲的内引擎性质得到了硬X射线中通量的边际检测。第二个脉冲最终以缓慢的恒定衰减结束，正如我们所显示的那样，它遵循闭合关系，以缓慢冷却等离子体扩展到恒定的星际介质中，并被视为光学余波Sensu stricto。
Following the detection of a long GRB 190919B by INTEGRAL (INTErnational Gamma-Ray Astrophysics Laboratory), we obtained an optical photometric sequence of its optical counterpart. The light curve of the optical emission exhibits an unusually steep rise ~100 s after the initial trigger. This behaviour is not expected from a 'canonical' GRB optical afterglow. As an explanation, we propose a scenario consisting of two superimposed flares: an optical flare originating from the inner engine activity followed by the hydrodynamic peak of an external shock. The inner-engine nature of the first pulse is supported by a marginal detection of flux in hard X-rays. The second pulse eventually concludes in a slow constant decay, which, as we show, follows the closure relations for a slow cooling plasma expanding into the constant interstellar medium and can be seen as an optical afterglow sensu stricto.
