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Origin of the bright prompt optical emission in the naked eye burst

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arxiv 1101.3952 v1 pith:D3BWQJXR submitted 2011-01-20 astro-ph.HE

Origin of the bright prompt optical emission in the naked eye burst

R. Hasco\"et (1 , 2) , F. Daigne (1 , R. Mochkovitch (1 , 2) ((1) UPMC Univ Paris 06 , UMR 7095 , Institut d'Astrophysique de Paris (2) CNRS , Institut d'Astrophysique de Paris) This is my paper
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The huge optical brightness of GRB 080319B (the "Naked Eye Burst) makes this event really challenging for models of the prompt GRB emission. In the framework of the internal shock model, we investigate a scenario where the dominant radiative process is synchrotron emission and the high optical flux is due to the dynamical properties of the relativistic outflow: if the initial Lorentz factor distribution in the jet is highly variable, many internal shocks will form within the outflow at various radii. The most violent shocks will produce the main gamma-ray component while the less violent ones will contribute at lower energy, including the optical range.

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