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arxiv: 1111.2922 · v2 · pith:MCDLKRUCnew · submitted 2011-11-12 · 🌌 astro-ph.HE

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
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Sergey Golenetskii Jay R. Cummings Jay P. Norris Abraham Falcone Scott D. Barthelmy Neil Gehrels
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classification 🌌 astro-ph.HE
keywords burstcentraldifferentdoubleengineswiftunusualaccretion
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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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