The ultra-long Gamma-Ray Burst 111209A: the collapse of a blue supergiant?

@article{Gendre2012TheUG,
  title={The ultra-long Gamma-Ray Burst 111209A: the collapse of a blue supergiant?},
  author={Bruce Gendre and G Stratta and J. L. Atteia and St{\'e}phane Basa and Michel Boer and David M. Coward and S. Cutini and V. D’Elia and E J Howell and A. Klotz L. Piro Asdcinaf and Observatory of RomeINAF and University of Toulouse and Observatoire Midi Pyr'en'ee and Irapcnrs and University of Aix-Marseille and Lamcnrs and ArtemisCNRS and Observatory of Haute ProvenceCNRS and Univ. of Western Australia and Iapsinaf},
  journal={The Astrophysical Journal},
  year={2012},
  volume={766},
  pages={30}
}
We present optical, X-ray and gamma-ray observations of GRB 111209A, at a redshift of z = 0.677. We show that this event was active in its prompt phase for about 25000 seconds, making it the longest burst ever observed. This rare event could have been detected up to z ~ 1.4. Compared to other long GRBs, GRB 111209A is a clear outlier in the energy-fluence and duration plane. The high-energy prompt emission shows no sign of a strong black body component, as expected if the event was caused by a… Expand
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