Esin AA, Blandford R
Astrophys J. 2000 May 10;534(2):L151-L154. doi: 10.1086/312670.
The deviation from the power-law decline of the optical flux observed in GRB 970228 and GRB 980326 has been used recently to argue in favor of the connection between gamma-ray bursts and supernovae. We consider an alternative explanation for this phenomenon, based on the scattering of a prompt optical burst by 0.1 M middle dot in circle dust located beyond its sublimation radius 0.1-1 pc from the burst. In both cases, the optical energy observed at the time of the first detection of the afterglow suffices to produce an echo after approximately 20-30 days, as observed. Prompt optical monitoring of future bursts and multiband photometry of the afterglows will enable us to test simple models of dust reprocessing quantitatively and to predict source redshift.
最近，人们利用在伽马射线暴GRB 970228和GRB 980326中观测到的光通量与幂律衰减的偏差，来支持伽马射线暴与超新星之间存在联系的观点。我们基于在爆发点0.1 - 1秒差距之外的半径处升华的0.1 M⊙尘埃对瞬时光学爆发的散射，考虑了对这一现象的另一种解释。在这两种情况下，如观测到的那样，在余辉首次探测时观测到的光能足以在大约20 - 30天后产生回声。对未来爆发进行瞬时光学监测以及对余辉进行多波段测光，将使我们能够定量测试尘埃再处理的简单模型，并预测源的红移。
