Journal Article

A complete sample of bright <i>Swift</i> long gamma-ray bursts: testing the spectral-energy correlations

L. Nava, R. Salvaterra, G. Ghirlanda, G. Ghisellini, S. Campana, S. Covino, G. Cusumano, P. D’Avanzo, V. D’Elia, D. Fugazza, A. Melandri, B. Sbarufatti, S. D. Vergani and G. Tagliaferri

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 421, issue 2, pages 1256-1264
Published in print April 2012 | ISSN: 0035-8711
Published online March 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.20394.x
A complete sample of bright Swift long gamma-ray bursts: testing the spectral-energy correlations

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We use a nearly complete sample of gamma-ray bursts (GRBs) detected by the Swift satellite to study the correlations between the spectral peak energy Epeak of the prompt emission, the isotropic energetics Eiso and the isotropic luminosity Liso. This GRB sample is characterized by a high level of completeness in redshift (90 per cent). This allows us to probe in an unbiased way the issue related to the physical origin of these correlations against selection effects. We find that one burst, GRB 061021, is an outlier to the EpeakEiso correlation. Despite this case, we find strong EpeakEiso and EpeakLiso correlations for the bursts of the complete sample. Their slopes, normalizations and dispersions are consistent with those found with the whole sample of bursts with measured redshift and Epeak. This means that the biases present in the total sample commonly used to study these correlations do not affect their properties. Finally, we also find no evolution with redshift of the EpeakEiso and EpeakLiso correlations.

Keywords: gamma-ray burst: general

Journal Article.  6810 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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