On the nature of X-ray Flashes
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We have developed a toy model for internal shocks which has been used to generate a large number of synthetic GRBs in order to find in the parameter space the conditions which can lead to the formation of X-ray flashes. The key condition appears to be a small contrast of the Lorentz factor in the relativistic wind emitted by the central engine.
4 pages, 4 figures, to appear in "Gamma-ray bursts in the afterglow era", 3rd workshop, Rome 17-20 Sept. 2002
4 pages, 4 figures, to appear in "Gamma-ray bursts in the afterglow era", 3rd workshop, Rome 17-20 Sept. 2002