AI 中文总结
本文发布第二版AMI-LA伽马射线暴射电余辉星表，含210个暴的1035次观测，分析射电辐射特性，揭示其光度分布范围广且依赖GRB物理参数的特征。
AI 中文摘要
伽马射线暴（GRB）余辉的射电观测可帮助研究喷流内不同辐射区域、流体动力学过程及暴周环境。本文介绍第二版弧分微Kelvin成像仪大阵列（AMI-LA）伽马射线暴射电余辉星表，该星表包含210个伽马射线暴的1035次观测数据，观测时间范围为暴后0.04天至900天。我们探测到19个事件的相关射电辐射，流量密度介于0.1至40mJy之间，并对6个光变曲线未在其他地方发表的事件进行详细分析。在单个余辉分析中，我们发现60%的射电对应体存在反向激波辐射的证据；2个探测到的余辉存在闪烁证据，我们借此在暴后数十天对源的尺寸设定了限制。在整个星表中，50个事件有红移测量值，我们据此计算样本的射电余辉光度分布，该分布跨越5个数量级，比光学和X射线波段的光度分布范围更大，表明射电对应体强烈依赖伽马射线暴的物理参数。
英文摘要
Radio observations of gamma-ray burst afterglows provide insight in to the different emitting regions within the jet, its hydrodynamics and burst environment. In this paper, we present the second iteration of the Arcminute Microkelvin Imager - Large Array (AMI-LA) Gamma-ray burst (GRB) radio afterglow catalog. The catalog consists of 1035 observations of 210 bursts. Our observations range from 0.04 to 900days post-burst. We detect radio emission associated with 19 events with flux densities spanning 0.1-40mJy, and present a detailed analysis of six events whose light curves have not been published elsewhere. In our individual afterglow analyses, we find that our radio counterparts show evidence of reverse shock emission 60% of the time. Two of the detected afterglows show evidence of scintillation which we use to place source size limits at tens of days. Of the whole catalog, 50 events have redshift measurements which we use to find the radio afterglow luminosity distribution for our sample. Our luminosity distribution spans five orders of magnitude, a larger range than seen in optical and X-ray bands, indicative of the strong dependence of the radio counterparts on the GRB's physical parameters.
Comments25 pages and 20 figures (included appendices). Submitted to ApJ
