A universal scaling for short and long gamma-ray bursts: Ex,iso - eγ,iso - epk

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

51 Scopus citations


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 - 104keV energy band during the prompt emission (Eγ, iso ), the peak of the prompt emission energy spectrum (Epk) and the X-ray energy emitted in the 0.3-10keV 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.

Original languageEnglish (US)
Pages (from-to)1199-1204
Number of pages6
JournalMonthly Notices of the Royal Astronomical Society
Issue number2
StatePublished - Sep 11 2012


  • Gamma-rays: general
  • Radiation mechanism: non-thermal
  • X-rays: general

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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