{
  "bibcode": "2013GCN.14576....1K",
  "body": "D. A. Kann (TLS Tautenburg), and S. Schulze (PUC, MCSS) report:\n\nUsing the energetics provided by the Konus-Wind detection (Golenetskii et\nal. 2013, GCN 14575) of the extremely intense Swift GRB 130505A (Cannizzo\net al. 2013, GCN 14564), and employing k-correction (Bloom et al. 2003,\nApJ, 594, 674), we determine the isotropic energy release in the\nbolometric band (rest-frame 1 keV - 10 MeV) to be (5.65 +/- 0.13) x 10^54\nerg (log E_iso = 54.75 +/- 0.01).\n\nThe most isotropically energetic GRBs known so far (all in the rest-frame\nbolometric band) are GRBs 990123, 080916C and 090323, for which log E_iso\n~ 54.5 - 54.6 has been found (e.g., Kann et al. 2010, ApJ, 720, 1513).\n\nThis makes GRB 130505A the most energetic GRB known, and may indicate\neither an ultra-luminous event or a high degree of collimation.\n\nWe additionally note that the nearby GRB 130427A (Maselli et al. 2013, GCN\n14448; Golenetskii et al. 2013, GCN 14487) is also highly energetic, with\nlog E_iso,bol = 54.21 +/- 0.05, but this is about 3.5 times less than GRB\n130505A.\n\nThis message may be cited.",
  "circularId": 14576,
  "createdOn": 1367784216000,
  "email": "kann@tls-tautenburg.de",
  "subject": "GRB 130505A: Largest E_iso ever measured",
  "submitter": "Alexander Kann at TLS Tautenburg  <kann@tls-tautenburg.de>",
  "eventId": "GRB 130505A"
}