标题： RAPTOR对GRB 050319的早期光学余辉观测 显示英文标题

标题： RAPTOR observations of the early optical afterglow from GRB 050319

摘要： 在洛斯阿拉莫斯国家实验室的快速光学响应（RAPTOR）系统在伽马射线暴警报望远镜（BAT）触发Swift卫星后25.4秒开始观测GRB 050319。我们得到的早期光学余辉的光变曲线由32个点组成（来源于70次曝光），这些点测量了伽马射线暴后第一个小时内的流量衰减。由RAPTOR测量的GRB 050319的光变曲线可以描述为一个相对平缓的流量下降（幂律指数α = -0.37），并在伽马射线暴后的约400秒处过渡到更快的流量衰减（α = -0.91）。将其他可用测量数据加入RAPTOR光变曲线后表明，在10^4秒后出现了另一个发射分量。我们假设早期的余辉发射是由持续的能量注入或延迟的逆向激波发射随后是正向激波发射所驱动的。 显示英文摘要

摘要： The RAPid Telescopes for Optical Response (RAPTOR) system at Los Alamos National Laboratory observed GRB 050319 starting 25.4 seconds after gamma-ray emission triggered the Burst Alert Telescope (BAT) on-board the Swift satellite. Our well sampled light curve of the early optical afterglow is composed of 32 points (derived from 70 exposures) that measure the flux decay during the first hour after the GRB. The GRB 050319 light curve measured by RAPTOR can be described as a relatively gradual flux decline (power-law index alpha = -0.37) with a transition, at about 400 s after the GRB, to a faster flux decay (alpha = -0.91). The addition of other available measurements to the RAPTOR light curve suggests that another emission component emerged after 10^4 s. We hypothesize that the early afterglow emission is powered by extended energy injection or delayed reverse shock emission followed by the emergence of forward shock emission.