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.
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Original Russian Text © D.A. Badjin, G.M. Beskin, G. Greco, 2009, published in Pis’ma v Astronomicheskiĭ Zhurnal, 2009, Vol. 35, No. 1, pp. 10–28.
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Badjin, D.A., Beskin, G.M. & Greco, G. Investigation of gamma-ray bursts with known redshifts: Statistical analysis of parameters. Astron. Lett. 35, 7–24 (2009). https://doi.org/10.1134/S1063773709010022
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DOI: https://doi.org/10.1134/S1063773709010022