Journal Article

A universal scaling for short and long gamma-ray bursts: <i>E</i><sub>X,iso</sub> - <i>E</i><sub>γ,iso</sub> - <i>E</i><sub>pk</sub>

M. G. Bernardini, R. Margutti, E. Zaninoni and G. Chincarini

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 425, issue 2, pages 1199-1204
Published in print September 2012 | ISSN: 0035-8711
Published online September 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2012.21487.x
A universal scaling for short and long gamma-ray bursts: EX,iso - Eγ,iso - Epk

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Abstract

The comprehensive statistical analysis of Swift X-ray light curves, collecting data from six years of operation, revealed the existence of a universal scaling among the isotropic energy emitted in the rest-frame 1 - 104 keV energy band during the prompt emission (), the peak of the prompt emission energy spectrum (Epk) and the X-ray energy emitted in the 0.3–10 keV observed energy band (EX, iso). In this paper, we show that this three-parameter correlation is robust and does not depend on our definition of EX, iso. It is shared by long, short and low-energetic gamma-ray bursts (GRBs), and thus reflects the existence of some properties which are shared by the GRB class as a whole. A more intuitive way to express the three-parameter correlation is in the form of a two-parameter correlation between the GRB efficiency and Epk. We speculate that the physical origin of such a relation is connected with the outflow Lorentz factor.

Keywords: radiation mechanism: non-thermal; gamma-rays: general; X-rays: general

Journal Article.  4321 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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