{
  "bibcode": "2013GCN.14575....1G",
  "body": "S. Golenetskii, R.Aptekar, D. Frederiks, E. Mazets, V. Pal'shin,\nP. Oleynik, M. Ulanov, D. Svinkin, and T. Cline on behalf\nof the Konus-Wind team, report:\n\nThe long very intense GRB 130505A (Swift-BAT trigger #555136:\nCannizzo et al., GCN 14564) triggered Konus-Wind (K-W)\nat T0=30147.038s UT (08:22:27.038).\n\nThe K-W light curve shows a bright pulse with a duration of ~5s\nfollowed by a weaker decaying emission out to ~T0+30s with\na slight increase in the count rate at ~T0+15s.\nThe emission is seen up to ~10 Mev.\n\nThe Konus-Wind light curve of this GRB is available at\nhttp://www.ioffe.ru/LEA/GRBs/GRB130505_T30147/\n\nAs observed by Konus-Wind, the main phase of the burst had\na fluence of (3.13 � 0.06)x10^-4 erg/cm2 and a 64-ms peak flux,\nmeasured from T0+2.496 s, of (6.9 � 0.3)x10^-5 erg/cm2/s\n(both in the 20 - 1200 keV energy range).\n\nThe time-averaged spectrum (measured from T0 to T0+21.248 s)\nis best fit in the 20 keV-15 MeV range\nby the GRB (Band) function with the following model parameters:\nthe low-energy photon index alpha = -0.69 � 0.04,\nthe high energy photon index beta = -2.03 � 0.03,\nthe peak energy Ep = 631 � 31 keV,\nchi2 = 113/92 dof.\n\nThe spectrum at the maximum count rate\n(measured from T0+2.304 to T0+2.816 s)\nis best fit in the 20 keV - 15 MeV range\nby the GRB (Band) function with the following model parameters:\nthe low-energy photon index alpha = -0.31 � 0.09,\nthe high energy photon index beta = -2.26 � 0.07,\nthe peak energy Ep = 604 � 49 keV,\nchi2 = 105/90 dof.\n\nAssuming z=2.27 (Tanvir et al., GCN 14567)\nand a standard cosmology model with H_0 = 70 km/s/Mpc,\nOmega_M = 0.27, and Omega_Lambda = 0.73,\nthe isotropic energy release E_iso is ~3.8x10^54 erg,\nthe peak luminosity (L_iso)_max is ~2.7x10^54 erg/s,\nand the rest-frame peak energy Ep,i = 2030 keV\n\nAll the quoted errors are estimated at the 1 sigma confidence level.",
  "circularId": 14575,
  "createdOn": 1367781562000,
  "email": "fred@mail.ioffe.ru",
  "subject": "Konus-Wind observation of GRB 130505A",
  "submitter": "Dmitry Frederiks at Ioffe Institute  <fred@mail.ioffe.ru>",
  "eventId": "GRB 130505A"
}