标题： 伽马射线暴周围的尘埃散射X射线膨胀环 显示英文标题

标题： Dust scattering X-ray expanding rings around gamma-ray bursts

摘要： 银河系中的尘埃颗粒散射可以产生X射线光环，在伽马射线暴（GRBs）周围可见为扩展的环。迄今为止，这种现象已在三个伽马射线暴中被观测到，从而能够推导出尘云的精确距离以及对未直接观测到的伽马射线暴X射线发射的一些限制。我们开发了一种新的分析方法来研究尘埃散射扩展环，并已将其应用于所有XMM-Newton和Swift/XRT对伽马射线暴的后续观测。 显示英文摘要

摘要： Scattering by dust grains in our Galaxy can produce X-ray halos, visible as expanding rings, around GRBs. This has been observed in three GRBs to date, allowing to derive accurate distances for the dust clouds as well as some constraints on the prompt GRB X-ray emission that was not directly observed. We developed a new analysis method to study dust scattering expanding rings and have applied it to all the XMM-Newton and Swift/XRT follow-up observations of GRBs.