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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X-Ray Flashes and X-Ray Rich Gamma Ray Bursts, fact very soft, x-ray rich, untriggered gamma ray bursts, in which the peak energy in 2-10 keV x-rays could be up to a factor of 100 larger than the peak energy in the 50-300 keV gamma ray range. The frequency is . yr..

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BATSE Observations of Fast X-Ray Transients Detected by BeppoSAX-WFC, detected in common with .SAX. Temporaland spectralc haracteristics, such as peak flux, fluence, duration, and spectrum are compared to the full population of triggered BATSE GRBs. We find that FXTs have softer spectra than most triggered bursts, but that they are consistent with the extrapolated hardness expected for low-intensity GRBs.

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Short Gamma-Ray Bursts Are Different,ignificantly distinct pulse peaks, we find an order of magnitude fewer pulses than found in studies of long bursts. The disparity in lag magnitude is discontinuous across the .-s valley between long and short bursts. Thus, short bursts do not appear to be representable as a continuation of long bursts’ temporalc haracteristics.

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Angewandte Mathematik: Body and Soul in the form of branches and loops representing the different parts of a burst time history. Despite the variety of features seen in different events, the main characteristics of the spectralev olution produce a quite consistent pattern.