A NEW POPULATION OF ULTRA-LONG DURATION GAMMA-RAY BURSTS

@article{Levan2013ANP,
  title={A NEW POPULATION OF ULTRA-LONG DURATION GAMMA-RAY BURSTS},
  author={Andrew J. Levan and Nial R. Tanvir and R L C Starling and Klaas Wiersema and Kim L. Page and Daniel A. Perley and Steve Schulze and Graham A. Wynn and Ryan Chornock and Jens Hjorth and S. Bradley Cenko and Andrew S. Fruchter and P. T. O’Brien and G. C. Brown and Rachel L. Tunnicliffe and Daniele B. Malesani and P. Jakobsson and Darach Watson and Edo Berger and David Bersier and B. E. Cobb and Stefano Covino and A. Cucchiara and Antonio de Ugarte Postigo and Derek B. Fox and Avishay Gal-yam and Paolo Goldoni and Javier Gorosabel and Lex Kaper and Thomas Kruehler and Raine Karjalainen and Julian P. Osborne and Elena Pian and R. S{\'a}nchez-Ram{\'i}rez and Brian Schmidt and Ian Skillen and Gianpiero Tagliaferri and Christina C. Th{\"o}ne and Ovidiu Văduvescu and R. A. M. J. Wijers and B. Ashley Zauderer},
  journal={The Astrophysical Journal},
  year={2013},
  volume={781}
}
We present comprehensive multiwavelength observations of three gamma-ray bursts (GRBs) with durations of several thousand seconds. We demonstrate that these events are extragalactic transients; in particular, we resolve the long-standing conundrum of the distance of GRB 101225A (the “Christmas-day burst”), finding it to have a redshift z = 0.847 and showing that two apparently similar events (GRB 111209A and GRB 121027A) lie at z = 0.677 and z = 1.773, respectively. The systems show extremely… 
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Astrophysics: A twist in the tale of γ-ray bursts
TLDR
It is reported that supernova SN 2011kl was associated with the ultra-long-duration γ-ray burst GRB 111209A at z = 0.677, adding support to the recent suggestion of a new class of ultra- long-duration (longer than 10,000 seconds) γ -ray bursts.
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We present optical, X-ray and gamma-ray observations of GRB 111209A, observed at a redshift of z = 0.677. We show that this event was active in its prompt phase for about 25000 s, making it the
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