Abstract We extend a previous work on the intrinsic spectral properties and energetics of GRBs with known redshift based on 12 BeppoSAX events by including in the sample a total of 10 more events detected either by BATSE, BeppoSAX or HETE-2. An indication of a trend of the total isotropic equivalent radiated energy, Erad, with redshift is found and, remarkably, the previously found relationship between the peak energy of the rest-frame ν F ν spectrum, Eprest and Erad is confirmed and its significance increased. The implications of these results are briefly discussed in the framework of standard models for the prompt emission of GRBs.
Keywords gamma-rays: observations - gamma-rays: bursts
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