On The Evolution Of The Spectral Break In The Afterglow Of Gamma Ray Bursts

TL;DR

This paper compares observed spectral break evolution in GRB afterglows with theoretical models, finding consistency with the cannonball model's predictions over the standard fireball model.

Contribution

It demonstrates that the spectral break evolution in specific GRB afterglows aligns with the cannonball model, challenging the standard fireball model's expectations.

Findings

Spectral break evolution matches the cannonball model predictions.

Standard fireball model does not explain the observed spectral evolution.

Supports the validity of the cannonball model for GRB afterglows.

Abstract

The temporal evolution of the spectral break in the time resolved spectral energy density of the broad band afterglow of gamma ray bursts (GRBs) 091127 and 080319B was shown recently to be inconsistent with that expected for the cooling break in the standard fireball model of GRBs. Here we show that it is, however, in good agreement with the predicted temporal evolution of the smooth injection break/bend in the cannonball model of GRBs.