Titlebook: Gamma-Ray Bursts in the Afterglow Era; Proceedings of the I Enrico Costa,Filippo Frontera,Jens Hjorth Conference proceedings 2001 Springer-

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Testing the Optically Thin Synchrotron Shock Model for Gamma-Ray Bursts Spectra from 2 to 700 keV wpoSAX data. This model gives a satisfactory description of the majority of the data. Nevertheless, . 30% need of accounting for substantial radiative cooling of the emitting electrons during the event.

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Short Gamma-Ray Bursts Are Different,ell as the number of distinct pulse structures per burst. Performing the cross-correlation between two energy bands, we measure an average lag .-40 x shorter than for long bursts, and a lag distribution close to symmetric about zero - unlike long bursts. Using a “Bayesian Block” method to identify s

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New Possibilities Offered by BeppoSAX: Automatic GRB Alerts Using GRBM,is operating since April, 2000. When a true celestial burst is recognized, this S/W yields some relevant data, like peak counts, total counts, duration. In the near future, the possible incoming direction will be included as well. This info is promptly and automatically distributed, in a fixed forma

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Probing the Isotropy in the Sky Distribution of the Gamma-Ray Bursts, gamma-ray bursts collected at BATSE Catalog. The tests use the counts-in-cells method, an analysis of spherical harmonics, a test based on the two-point correlation function and a method based on multiscale methods. The tests suggest that the intermediate subclass of gamma-ray bursts are distribute

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