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Gamma-Ray Burst Early Afterglows

Bing Zhang

Abstract

Abstract. The successful launch and operation of NASA’s Swift Gamma-Ray Burst Explorer open a new era for the multi-wavelength study of the very early afterglow phase of gamma-ray bursts (GRBs). GRB early afterglow information is essential to explore the unknown physical composition of GRB jets, the link between the prompt γ-ray emission and the afterglow emission, the GRB central engine activity, as well as the immediate GRB environment. Here I review some of the recent theoretical efforts to address these problems and describe how the latest Swift data give answers to these outstanding questions. Keywords: Gamma-ray burst; afterglow; X-ray; UV; optical; Swift PACS: 95.30.-k, 95.55.-n, 95.85.-e, 97.60.-s

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Key concepts: Gamma-ray burst, Afterglow, Swift, Physics, Astrophysics, Astronomy