GRB100814A as a member of the growing set of bursts with sudden optical rebrightening

TL;DR

This paper analyzes multi-wavelength data of GRB100814A, highlighting a sudden optical rebrightening and discussing potential physical explanations, contributing to understanding the diversity of gamma-ray burst afterglows.

Contribution

It presents detailed observations of GRB100814A's optical rebrightening and compares it with similar bursts, proposing possible mechanisms for this phenomenon.

Findings

Optical rebrightening observed at the end of the slow decline phase.

Possible chromatic variations during rebrightening.

Comparison with other Swift bursts showing similar features.

Abstract

We present the gamma-ray, X-ray, optical and radio data for GRB100814A. At the end of the slow decline phase of the X-ray and optical afterglow, a sudden and prominent rebrightening in the optical band occurs followed by a fast decay in both bands. This optical rebrightening is accompanied by possible chromatic variations. We discuss possible interpretations, such as double component scenarios and internal dissipation mechanism, with their virtues and drawbacks. We also compare GRB100814A with other Swift bursts that show optical rebrightenings with similar properties.