Spectral Properties of GRBs Observed with BeppoSAX

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Abstract
The BeppoSAX mission has not only significantly improved the Gamma‐Ray Burst science through the discovery of the afterglows but is also providing important data on the prompt events. The Gamma‐Ray Burst Monitor is building a catalogue of GRBs that, due to a recently achieved, coarse but suitable positioning capabilities, can usefully integrate and extend the BATSE catalogues. We show the good relative calibration of the two experiments. Wide Field Cameras are providing a sample of about 40 GRBs, in an important band so far relatively ill covered. Moreover the combined use of the two instruments is providing a unique information on the spectral evolution of the GRBs. We show some recent spectral results based on these data and discuss the impact on our knowledge of GRB physics.

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