Gamma Ray Bursts Cook Book II: Simulation

TL;DR

This paper presents simulations based on a relativistic shock and synchrotron emission model for Gamma-Ray Bursts, demonstrating its ability to reproduce observed prompt and afterglow emissions and validating two proposed phenomenological models.

Contribution

It introduces simulation results that support the physical relevance of two models for the active region evolution in GRBs, comparing their effectiveness.

Findings

Simulations successfully reproduce GRB prompt and afterglow emissions.

The dynamical active region model better fits observed prompt and late afterglow data.

Results validate the phenomenological models proposed in Paper I.

Abstract

In Paper I we presented a detailed formulation of the relativistic shocks and synchrotron emission in the context of Gamma-Ray Burst (GRB) physics. To see how well this model reproduces the observed characteristics of the GRBs and their afterglows, here we present the results of some simulations based on this model. They are meant to reproduce the prompt and afterglow emission in some intervals of time during a burst. We show that this goal is achieved for both short and long GRBs and their afterglows, at least for part of the parameter space. Moreover, these results are the evidence of the physical relevance of the two phenomenological models we have suggested in Paper I for the evolution of the {\it active region}, the synchrotron emitting region in a shock. The dynamical active region model seems to reproduce the observed characteristics of prompt emissions and late afterglow better than the quasi-steady model which is more suitable for the onset of afterglows. Therefore these simulations confirm the arguments presented in Paper I about the behaviour of these models based on their physical properties.