Gamma-ray burst models with general dynamics and fits to Fermi LAT bursts

TL;DR

This paper introduces a dissipative photospheric model for gamma-ray bursts that explains MeV and GeV emissions through synchrotron processes and interactions at the photosphere and deceleration radius.

Contribution

The model incorporates general initial acceleration and explains both MeV and GeV emissions in gamma-ray bursts with a unified framework.

Findings

MeV peak arises from synchrotron emission near the photosphere

GeV emission results from interactions at the deceleration radius

Model successfully fits observed Fermi LAT burst spectra

Abstract

We present a dissipative photospheric model for gamma-ray bursts where the usual Band peak around MeV energies arises as synchrotron emission from around the photosphere. We treat the initial acceleration in a general way and the GeV emission arises as the interaction of photospheric radiation and the shocked electrons at the deceleration radius. We show some applications of this model.