Achromatic Breaks for Swift GRBs: Any Evidence?

TL;DR

This paper reviews the evidence for achromatic breaks in Swift gamma-ray burst afterglows, highlighting the lack of conclusive confirmation despite high-quality multi-wavelength data.

Contribution

It provides a critical review of observed cases, questioning the universality of achromatic breaks in the standard afterglow model.

Findings

Few confirmed achromatic breaks in Swift data

Challenges to the standard afterglow model

Highlights need for further multi-wavelength observations

Abstract

The availability of multi-wavelength high-quality data of gamma-ray burst afterglows in the Swift era, contrary to the expectations, did not allow us to fully confirm yet one of the most fundamental features of the standard afterglow picture: the presence of an achromatic break in the decaying light curve. We briefly review the most interesting cases identified so far.