Unusual Central Engine Activity in the Double Burst GRB 110709B

Details Unusual Central Engine Activity in the Double Burst GRB 110709B Unusual Central Engine Activity in the Double Burst GRB 110709B

2011-11-12

arxiv.org/abs/1111.2922v2

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

10 pages, 14 figures, 2 tables. ApJ accepted

Scientific paper

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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