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
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.
View original:
http://arxiv.org/abs/1111.2922
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