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 Giulia Stratta and J. L. Atteia and S. Basa and M. Bo{\"e}r and D. M. Coward and S. Cutini and V. D’Elia and E J Howell and A. Klotz and Luigi Piro},
  journal={The Astrophysical Journal},
  year={2012},
  volume={766}
}
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 longest burst ever observed. This rare event could have been detected up to z ∼ 1.4 in gamma-rays. Compared to other long gamma-ray bursts (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 blackbody component, the… 
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