Scattering by dust grains in our Galaxy can produce X-ray halos, visible as expanding rings, around GRBK. This has been observed in three GRBs to date, allowing to derive accurate distances for the dust clouds as well an 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.
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