- Conference date: 9–13 July 2012
- Location: Heidelberg, Germany
Recent broad-band observations of Gamma-Ray Burst (GRB) prompt emission sharpened the debates regarding several open questions in GRB physics, including jet composition, energy dissipation mechanism, particle acceleration mechanism, and radiation mechanism. Here I review these open questions, the arguments in support of the opponents on both sides of the debates, as well as observational clues and tests that can be used to settle down these debates in the future. I also summarize my personal view on GRB prompt emission: The normal “Band”-function component as observed in most GRBs (e.g. in GRB 080916C) is likely synchrotron emission from an optically thin region. The narrow “Band” component observed in GRB 090902B, and the quasi-thermal “shoulder” component superposed on the left wing of the Band component in some GRBs are the photosphere emission component. Different GRBs may have different values of magnetization parameter σ0 at the central engine, which may be the origin of the diverse spectral behaviors as observed.
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