Luminosity--time and luminosity--luminosity correlations for GRB prompt and afterglow plateau emissions

Abstract

We present an analysis of 123 Gamma-ray bursts (GRBs) with known redshifts possessing an afterglow plateau phase. We reveal that $L_a-T_a^{\ast }$ correlation between the X-ray luminosity $L_a$ at the end of the plateau phase and the plateau duration, $T_a^{\ast }$, in the GRB rest frame has a power law slope different, within more than 2 $\sigma$, from the slope of the prompt $L_f-T_f^{\ast }$ correlation between the isotropic pulse peak luminosity, $L_f$, and the pulse duration, $T_f^{\ast }$, from the time since the GRB ejection. Analogously, we show differences between the prompt and plateau phases in the energy-duration distributions with the afterglow emitted energy being on average $10\%$ of the prompt emission. Moreover, the distribution of prompt pulse versus afterglow spectral indexes do not show any correlation. In the further analysis we demonstrate that the $L_{peak}-L_a$ distribution, where $L_{peak}$ is the peak luminosity from the start of the burst, is characterized with a considerably higher Spearman correlation coefficient, $\rho =0.79$, than the one involving the averaged prompt luminosity, $L_{prompt}-L_a$, for the same GRB sample, yielding $\rho =0.60$. Since some of this correlation could result from the redshift dependences of the luminosities, namely from their cosmological evolution we use the Efron-Petrosian method to reveal the intrinsic nature of this correlation. We find that a substantial part of the correlation is intrinsic. We apply a partial correlation coefficient to the new de-evolved luminosities showing that the intrinsic correlation exists.

12 pages, 17 pictures accepted in MNRAS, 28 May 2015

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