Unusual Central Engine Activity in the Double Burst GRB 110709B
Bin-Bin Zhang, David Burrows, Bing Zhang, Peter Meszaros, Xiang-Yu, Wang, Giulia Stratta, Valerio D'Elia, Dmitry Frederiks, Sergey Golenetskii,, Jay R. Cummings, Jay P. Norris, Abraham Falcone, Scott D. Barthelmy, Neil, Gehrels
TL;DR
This paper reports the first observation of a double-trigger gamma-ray burst with Swift, analyzing its unique central engine activity and spectral evolution to suggest a magnetar-to-black hole transition.
Contribution
It provides the first detailed analysis of a double-trigger GRB, proposing a novel magnetar-to-BH accretion model for its central engine.
Findings
First double-trigger GRB observed by Swift.
Different spectral evolution indicates separate engine episodes.
Supports magnetar-to-BH transition hypothesis.
Abstract
The double burst, GRB 110709B, triggered Swift/BAT twice at 21:32:39 UT and 21:43:45 UT, respectively, on 9 July 2011. This is the first time we observed a GRB with two BAT triggers. In this paper, we present simultaneous Swift and Konus-WIND observations of this unusual GRB and its afterglow. If the two events originated from the same physical progenitor, their different time-dependent spectral evolution suggests they must belong to different episodes of the central engine, which may be a magnetar-to-BH accretion system.
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