Afterglow from GRB 070610/Swift J195509.6+261406: an explanation using the fireball model

TL;DR

This paper explains the afterglow of the peculiar Galactic transient GRB 070610/Swift J195509.6+261406 using the fireball model and energy injection hypothesis, showing consistency with observed X-ray and optical light curves.

Contribution

It applies the fireball model and energy injection hypothesis to interpret the afterglow of a unique Galactic transient, providing a plausible explanation for its variability.

Findings

Model is consistent with observed light curves

Supports SGR interpretation for the transient

Highlights the role of energy injection in afterglow evolution

Abstract

GRB 070610, which is also named Swift J195509.6+261406, is a peculiar Galactic transient with significant variability on short timescales in both X-ray and optical light curves. One possible explanation is that GRB 070610/Swift J195509.6 + 261406 is a soft gamma-ray repeater (SGR) in our Galaxy. Here we use the fireball model which is usually recognized as the standard model of gamma-ray burst (GRB) afterglows, and the energy injection hypothesis to interpret the X-ray and optical afterglow light curves of GRB 070610/Swift J195509.6 + 261406. It is found that the model is generally consistent with observations.