Astron. Astrophys. Suppl. Ser. 138, 523-524
F. Daigne - R. Mochkovitch
Send offprint request: F. Daigne
Institut d'Astrophysique de Paris, CNRS, 98 bis boulevard Arago, 75014 Paris, France
Received December 29, 1998; accepted March 9, 1999
BeppoSAX observations of the single pulse burst GRB 960720 have allowed a detailed study of its X-ray properties: pulse width in different energy bands, spectral evolution from 2 to 700 keV, etc. We show that the early (0-5 s) X-ray emission and the gamma-rays are well explained by internal shocks in a relativistic wind while the late (5-20 s) X-ray emission could come from the reverse shock generated in the wind when it interacts with the external medium. The results for a medium of uniform density are compared to the observations.
Key words: gamma-rays: bursts
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