Journal
ASTRONOMY & ASTROPHYSICS
Volume 390, Issue 1, Pages 81-89Publisher
E D P SCIENCES
DOI: 10.1051/0004-6361:20020722
Keywords
gamma-rays : bursts; gamma rays : observations; X-rays : general
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We present the main results of a study of spectral and energetics properties of twelve gamma-ray bursts (GRBs) with redshift estimates. All GRBs in our sample were detected by BeppoSAX in a broad energy range (2-700 keV). From the redshift estimates and the good-quality BeppoSAX time-integrated spectra we deduce the main properties of GRBs in their cosmological rest frames. All spectra in our sample are satisfactorily represented by the Band model, with no significant soft X-ray excesses or spectral absorptions. We find a positive correlation between the estimated total (isotropic) energies in the 1-10 000 keV energy range (E-rad) and redshifts z. Interestingly, more luminous GRBs are characterized also by larger peak energies E(p)s of their EF(E) spectra. Furthermore, more distant GRBs appear to be systematically harder in the X-ray band compared to GRBs with lower redshifts. We discuss how selection and data truncation effects could bias our results and give possible explanations for the correlations that we found.
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