ARE ULTRA-LONG GAMMA-RAY BURSTS DIFFERENT?

@article{Bor2013AREUG,
  title={ARE ULTRA-LONG GAMMA-RAY BURSTS DIFFERENT?},
  author={M. Bo{\"e}r and Bruce Gendre and G. Stratta},
  journal={The Astrophysical Journal},
  year={2013},
  volume={800}
}
The discovery of a number of gamma-ray bursts (GRBs) with duration exceeding 1000 s has opened the debate on whether these bursts form a new class of sources, the so-called ultra-long GRBs, or if they are rather the tail of the distribution of the standard long GRB duration. Using the long GRB sample detected by Swift, we investigate the statistical properties of long GRBs and compare them with the ultra-long burst properties. We compute the burst duration of long GRBs using the start epoch of… 

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