The unusual GRB 110709B triggered Swift/BAT twice, with a time difference of ∼11 minutes. Its light curve presented three noticeable peaks but only two were originally identified. In this work, we describe each peak as due to a different central-engine phase: the first one is the millisecond-protomagnetar stage, the second one is the BH-formation collapse phase and the last one is the Collapsar scenario with a Blandford-Znajek engine. Additionally, we analyze and explain the afterglow phase evoking the standard fireball model. Our model can successfully describe the timescales, fluxes and spectral indices observed for GRB 110709B.
@article{arxiv.1506.08470,
title = {Reviewing the case of the atypical central-engine activity in GRB 110709B},
author = {Nissim Fraija and Enrique Moreno-Méndez and Barbara Patricelli},
journal= {arXiv preprint arXiv:1506.08470},
year = {2015}
}
Comments
6 pages, 1 figure. In proceedings of "Swift: 10 Years of Discovery" congress (Rome, 2-4 December 2014), PoS(SWIFT 10)093