Origin Of The Far Off-Axis GRB171205A

TL;DR

This paper proposes that the low-luminosity GRB171205A is an ordinary supernova-associated GRB observed from a far off-axis angle, explained by inverse Compton scattering in a narrowly collimated jet, and suggests radio observations can test this hypothesis.

Contribution

It introduces a model where off-axis viewing explains the properties of GRB171205A, linking it to standard SN-GRBs via inverse Compton scattering, and proposes observational tests to distinguish it from other GRB classes.

Findings

GRB171205A's properties align with an off-axis SN-GRB model.

Radio observations can confirm the superluminal motion predicted by the model.

The model explains low luminosity through viewing angle effects.

Abstract

We show that observed properties of the low luminosity GRB171205A and its afterglow, like those of most other low-luminosity (LL) gamma ray bursts (GRBs) associate with a supernova (SN), indicate that it is an ordinary SN-GRB, which was produced by inverse Compton scattering of glory light by a highly relativistic narrowly collimated jet ejected in a supernova explosion and viewed from a far off-axis angle. As such, VLA/VLBI follow-up radio observations of a superluminal displacement of its bright radio afterglow from its parent supernova, will be able to test clearly whether it is an ordinary SN-GRB viewed from far off-axis or it belongs to a distinct class of GRBs, which are different from ordinary GRBs, and cannot be explained by standard fireball models of GRBs as ordinary GRBs