Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-07-04
Astronomy and Astrophysics
Astrophysics
5 pages, 2 figures, revised version, MNRAS Letters, in press
Scientific paper
10.1111/j.1745-3933.2007.00396.x
If the early optical data of GRB 060218 up to 1e5 s are interpreted as the black-body flux associated with the supernova shock breakout, we can derive lower limits to the bolometric luminosity and energetics of this black-body component. These limits are more severe for the very early data that imply energetics of order of 1e51 erg. These values, puzzlingly large, are rather independent of the assumed time profile of the emitting surface, provided that the corresponding radius does not increase superluminally. Another concern is the luminosity of the black-body component observed in the X-rays, that is large and appears to be produced by an approximately constant temperature and a surface area increasing only slowly in time. Although it has been suggested that the long X-ray black-body duration is consistent with the supernova shock breakout if anisotropy is assumed, the nearly constant emitting surface requires some fine tuning, allowing and suggesting an alternative interpretation, i.e. emission from late dissipation of the fireball bulk kinetic energy. This in turn requires a small value of the bulk Lorentz factor.
Ghirlanda Giancarlo
Ghisellini Gabriele
Tavecchio Fabrizio
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