TeV Afterglow of BOAT GRB without Jet Break

TL;DR

This paper introduces a new model explaining the TeV afterglow of GRB 221009A through magnetic acceleration and circumstellar medium structure changes, without requiring an early jet break, highlighting the role of magnetized ejecta.

Contribution

The model uniquely combines magnetic acceleration and medium structure variation to explain TeV afterglow features without early jet break assumptions.

Findings

TeV flux increase explained by magnetic acceleration.

Circumstellar medium transition accounts for light curve breaks.

Deceleration time estimated around 400 seconds.

Abstract

We present a new model for the TeV afterglow of GRB 221009A. The rapid increase of the TeV flux in the very early phase is reproduced by the magnetic acceleration. We consider the change in the radial structure of the circumstellar medium from homogeneous to wind-like to describe the breaks in the TeV light curve. Our results imply a highly magnetized ejecta with a significantly thick width, making the deceleration time around 400 s for observers. In our model, no early jet break is required.