Sub-photospheric, radiation mediated shocks in GRBs: Multiple shock emission and the Band spectrum

Abstract

We compute the time integrated, thermal emission produced by a series of radiation mediated shocks that emerge from the photosphere of a GRB outflow. We show that for a sufficiently broad distribution of shock strengths, the overall shape of the time integrated spectral energy distribution below the peak is a power law, $\nu E_{\nu }\propto {\nu }^{\alpha }$, with a slope $1<\alpha <2$. A substructure in the SED can also be produced in this model for certain choices of the shock train distribution. In particular, we demonstrate that our model can reproduce the double-peak SED observed in some bursts, in events whereby a strong shock is followed by a sequence sufficiently weaker ones.

arXiv comment15 pages, 7 figures

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Cited by in corpus (17)

• Physics of Gamma-Ray Bursts Prompt Emission
• UHECR acceleration at GRB internal shocks
• Physics of radiation mediated shocks and its applications to GRBs, supernovae, and neutron star mergers
• High efficiency photospheric emission entailed by formation of a collimation shock in gamma-ray bursts
• Monte-Carlo simulations of relativistic radiation mediated shocks: I. photon rich regime
• Photospheric Emission in Gamma-Ray Bursts
• Gamma-ray burst spectra and spectral correlations from sub-photospheric Comptonization
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• Particle acceleration, magnetization and radiation in relativistic shocks
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• Extreme luminosities in ejecta produced by intermittent outflows around rotating black holes
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• Signs of magnetic acceleration and multi-zone emission in GRB 080825C
• Radiation-mediated shocks in gamma-ray bursts: spectral evolution