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The afterglows of gamma-ray bursts (GRBs) have commonly been assumed to bedue to shocks sweeping up the circum-stellar medium. However, most GRBs havebeen found in dense star-forming regions where a significant fraction of theprompt X-ray emission can be scattered by dust grains. Here we revisit thebehavior of dust scattering of X-rays in GRBs. We find that the features ofsome X-ray afterglows from minutes to days after the gamma-ray triggers areconsistent with the scattering of prompt X-ray emission from GRBs off host dustgrains. This implies that some of the observed X-ray afterglows (especiallythose without sharp rising and decaying flares) could be understood with adust-scattering--driven emission model.Comment: ApJ, in pres

Behavior of X‐Ray Dust Scattering and Implications for X‐Ray Afterglows of Gamma‐Ray Bursts