Ghisellini gives a great review of what we known about gamma-ray bursts and the puzzles that remain. He presents the seven pillars of GRB knowledge: GRBs are cosmological, GRBs have relativistic bulk motion, two phases (prompt and afterglow emission), long and short GRBs, spikes have same duration, supernova connection and peak energy. He also presents some puzzles: the engine, role of magnetic fields, what makes prompt emission, correlation between SEDs and other features and the high energy emission.
arXiv:1010.3015 [pdf, ps, other] Title: Gamma Ray Bursts: basic facts and ideas
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