Revisiting the Light Curves of Gamma-ray Bursts in the Relativistic Turbulence Model

Abstract

Rapid temporal variability has been widely observed in the light curves of gamma-ray bursts (GRBs). One possible mechanism for such variability is related to the relativistic eddies in the jet. In this paper, we include the contribution of the inter-eddy medium together with the eddies to the gamma-ray emission. We show that the gamma-ray emission can either lead or lag behind the observed synchrotron emission, where the latter originates in the inter-eddy medium and provides most of seed photons for producing gamma-ray emission through the inverse-Compton scattering. As a consequence, we argue that the lead/lag found in non-stationary short-lived light curves may not reveal the intrinsic lead/lag of different emission components. In addition, our results may explain the lead of gamma-ray emission with respect to optical emission observed in GRB 080319B.

15 pages, 5 figures, accepted for publication in ApJ

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• Variabilities of Gamma-ray Bursts from Black Hole Hyper-accretion Disks
• A 3.8yr optical quasi-periodic oscillations in blue quasar SDSS J132144+033055 through combined light curves from CSS and ZTF
• Steep Decay Phase Shaped by the Curvature Effect. II. Spectral Evolution
• Photospheric Emission in Gamma-ray Bursts: Variability
• Average Power-Density Spectrum of short and long Fermi-GBM Gamma-Ray Bursts