Unusual central engine activity in the double burst GRB 110709B

Bin Bin Zhang, David N. Burrows, Bing Zhang, Peter Mészáros, Xiang Yu Wang, Giulia Stratta, Valerio D'Elia, Dmitry Frederiks, Sergey Golenetskii, Jay R. Cummings, Jay P. Norris, Abraham D. Falcone, Scott D. Barthelmy, Neil Gehrels

Research output: Contribution to journalArticlepeer-review

35 Scopus citations


The double burst, GRB 110709B, triggered the Swift/Burst Alert Telescope (BAT) twice at 21:32:39 UT and 21:43:45 UT, respectively, on 2011 July 9. This is the first time we observed a gamma-ray burst (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.

Original languageEnglish (US)
Article number132
JournalAstrophysical Journal
Issue number2
StatePublished - Apr 1 2012

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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