GeV Emission from Collisional Magnetized Gamma Ray Bursts

TL;DR

This paper proposes a magnetically dominated jet model for gamma-ray bursts that explains the delayed GeV emission and predicts a multi-GeV neutrino component, aligning with recent Fermi satellite observations.

Contribution

It introduces a combined magnetic dissipation and nuclear collision model that reproduces observed MeV and GeV emission features, including the delay.

Findings

Reproduces the time delay between MeV and GeV emissions.

Predicts a multi-GeV neutrino component.

Aligns with Fermi satellite observations.

Abstract

Magnetic fields may play a dominant role in gamma-ray bursts, and recent observations by the Fermi satellite indicate that GeV radiation, when detected, arrives delayed by seconds from the onset of the MeV component. Motivated by this, we discuss a magnetically dominated jet model where both magnetic dissipation and nuclear collisions are important. We show that, for parameters typical of the observed bursts, such a model involving a realistic jet structure can reproduce the general features of the MeV and a separate GeV radiation component, including the time delay between the two. The model also predicts a multi-GeV neutrino component.