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Astronomy Letters

, Volume 35, Issue 1, pp 7–24 | Cite as

Investigation of gamma-ray bursts with known redshifts: Statistical analysis of parameters

  • D. A. BadjinEmail author
  • G. M. Beskin
  • G. Greco
Article

Abstract

Observational parameters of the optical and gamma-ray emissions from 58 gamma-ray bursts (GRBs) with discovered afterglows and known redshifts are analyzed. The distributions of these parameters and pair correlations between them are studied. Approximately half of the objects exhibit a relatively slow decrease in the optical flux at initial afterglow phases (with a power-law index in the decay law α < 1). Correlations have been found between the luminosities, energies, and durations of the optical and gamma-ray emissions, which can be explained by the presence of universal features in the light curves. A correlation of the peak luminosity for afterglows with the redshift and an anticorrelation of their durations with the redshift have been found for the first time. Against the background of a weak z dependence of the total afterglow energy, this effect can be explained by cosmological evolution of the GRB environment, which determines the rate of optical energy release.

Key words

gamma-ray bursts afterglows 

PACS numbers

98.70.Rz 

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Copyright information

© Pleiades Publishing, Ltd. 2009

Authors and Affiliations

  1. 1.Sternberg Astronomical InstituteMoscowRussia
  2. 2.Special Astrophysical ObservatoryRussian Academy of SciencesNizhnii ArkhyzRussia
  3. 3.Astronomy DepartmentBologna UniversityBolognaItaly

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