Theoretical Modelling of Gamma-Ray Burst 090510

TL;DR

This paper presents a theoretical model of the short gamma-ray burst GRB 090510 using relativistic magnetohydrodynamics, estimating key properties like jet angle and energetics, and comparing them with observations.

Contribution

It introduces a detailed relativistic MHD modeling approach for GRB 090510, exploring both 2D and 3D models to infer physical parameters and compare with observational data.

Findings

Jet opening angle within 88% of observed upper limit

Energetics consistent with observations considering redshift evolution

Model provides a foundation for future observational alignment

Abstract

Gamma-ray bursts detected at high energies provide valuable insights into the emission mechanisms behind these still puzzling enigmatic events. In this study, we focus on GRB 090510, which is an unusual short GRB exhibiting plateau emission observed by the Fermi-LAT. Using the general relativistic magnetohydrodynamic code (HARM), we aim to infer the key properties of this GRB, such as the jet opening angle, the energetics, the Lorentz Gamma factor, the jet structure and its variability, and the progenitor parameters of the compact binary system. We explored both the 2D and 3D models and estimated the variability timescales. Our findings show that the predicted jet opening angle is within $88\%$ of the observed upper limit from observations, and the energetics are in general agreement with observed values when accounting for the evolution of jet opening angle with redshift. This work establishes the foundation for ongoing exploration, which will further align the theoretical model simulations with observational data.