The peculiar physics of GRB 170817A and their implications for short GRBs

TL;DR

GRB 170817A's unusual properties challenge existing models of short gamma-ray burst emission, prompting reconsideration of the physics involved in such cosmic events.

Contribution

This paper analyzes the peculiar features of GRB 170817A and discusses their implications for the theoretical understanding of short GRB emission mechanisms.

Findings

GRB 170817A has low luminosity but similar peak energy to typical short GRBs.

Standard emission models struggle to explain the burst's properties.

The event challenges current theories of GRB emission physics.

Abstract

The unexpected nearby gamma-ray burst GRB 170817A associated with the LIGO binary neutron star merger event GW170817 presents a challenge to the current understanding of the emission physics of short gamma-ray bursts (GRBs). The event's low luminosity but similar peak energy compared to standard short GRBs are difficult to explain with current models, challenging our understanding of the GRB emission process. Emission models invoking synchrotron radiation from electrons accelerated in shocks and photospheric emission are particularly challenging explanations for this burst.