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Abstract: If the early optical data of GRB 060218 up to 1e5 s are interpreted as theblack-body flux associated with the supernova shock breakout, we can derivelower limits to the bolometric luminosity and energetics of this black-bodycomponent. These limits are more severe for the very early data that implyenergetics of order of 1e51 erg. These values, puzzlingly large, are ratherindependent of the assumed time profile of the emitting surface, provided thatthe corresponding radius does not increase superluminally. Another concern isthe luminosity of the black-body component observed in the X-rays, that islarge and appears to be produced by an approximately constant temperature and asurface area increasing only slowly in time. Although it has been suggestedthat the long X-ray black-body duration is consistent with the supernova shockbreakout if anisotropy is assumed, the nearly constant emitting surfacerequires some fine tuning, allowing and suggesting an alternativeinterpretation, i.e. emission from late dissipation of the fireball bulkkinetic energy. This in turn requires a small value of the bulk Lorentz factor.



Autor: G. Ghisellini, G. Ghirlanda, F. Tavecchio INAF-Osservatorio Astronomico di Brera

Fuente: https://arxiv.org/







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