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The unusual GRB 110709B triggered Swift/BAT twice, with a time difference of$\sim 11$ minutes. Its light curve presented three noticeable peaks but onlytwo were originally identified. In this work, we describe each peak as due to adifferent central-engine phase: the first one is the millisecond-protomagnetarstage, the second one is the BH-formation collapse phase and the last one isthe Collapsar scenario with a Blandford-Znajek engine. Additionally, we analyzeand explain the afterglow phase evoking the standard fireball model. Our modelcan successfully describe the timescales, fluxes and spectral indices observedfor GRB 110709B.

Reviewing the case of the atypical central-engine activity in GRB 110709B