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astro-ph2004
Probing the environment in Gamma-ray bursts: the case of an X-ray precursor, afterglow late onset and wind vs constant density profile in GRB011121 and GRB011211
L. Piro, M. De Pasquale, P. Soffitta +9
In this paper we present BeppoSax and XMM observations of two long Gamma-ray bursts, the X-ray rich event of December 11, 2001 (GRB011211) and the hard and very bright event of Nov…
astro-ph2004
Absorption in Gamma Ray Burst afterglows
G. Stratta, F. Fiore, L. A. Antonelli +2
We studied the X-ray and optical absorption properties of 13 Gamma Ray Burst (GRB) afterglows observed by BeppoSAX. We found that X-ray absorption in addition to the Galactic one a…
astro-ph2002
A comparative study of the X-ray afterglow properties of optically bright and dark GRBs
M. De Pasquale, L. Piro, R. Perna +9
We have examined the complete set of X-ray afterglow observations of dark and optically bright GRBs performed by BeppoSAX until February 2001. X-ray afterglows are detected in 90%…