DISCERNING THE PHYSICAL ORIGINS OF COSMOLOGICAL GAMMA-RAY BURSTS BASED ON MULTIPLE OBSERVATIONAL CRITERIA: THE CASES OF z = 6.7 GRB 080913, z = 8.2 GRB 090423, AND SOME SHORT/HARD GRBs

@article{Zhang2009DISCERNINGTP,
  title={DISCERNING THE PHYSICAL ORIGINS OF COSMOLOGICAL GAMMA-RAY BURSTS BASED ON MULTIPLE OBSERVATIONAL CRITERIA: THE CASES OF z = 6.7 GRB 080913, z = 8.2 GRB 090423, AND SOME SHORT/HARD GRBs},
  author={Bing Zhang and Bin-Bin Zhang and Francisco J. Virgili and E. W. Liang and David Alexander Kann and Xue-Feng Wu and D. Proga and Houjun Lv and Kenji Toma and P{\'e}ter M{\'e}sz{\'a}ros and David N. Burrows and Peter W. A. Roming and Neil Gehrels},
  journal={The Astrophysical Journal},
  year={2009},
  volume={703},
  pages={1696-1724}
}
The two high-redshift gamma-ray bursts, GRB 080913 at z = 6.7 and GRB 090423 at z = 8.2, recently detected by Swift appear as intrinsically short, hard GRBs. They could have been recognized by BATSE as short/hard GRBs should they have occurred at z ≤ 1. In order to address their physical origin, we perform a more thorough investigation on two physically distinct types (Type I/II) of cosmological GRBs and their observational characteristics. We reiterate the definitions of Type I/II GRBs and… Expand
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