{
  "bibcode": "2016GCN.19462....1K",
  "body": "A. Kozlova, S. Golenetskii, R. Aptekar, D. Frederiks, P. Oleynik,\nM. Ulanov, D. Svinkin, A. Tsvetkova, A. Lysenko, and T. Cline\non behalf of the Konus-Wind team, report:\n\nThe long-duration GRB 160521B\n(Fermi-GBM detection: Yu and Veres, GCN 19443;\nFermi-LAT detection: Axelsson et al., GCN 19444)\ntriggered Konus-Wind at T0=33237.337 s UT (09:13:57.337).\n\nThe burst light curve shows a broad, multi-peaked pulse\nstarted at ~T0-0.3 s with a total duration of ~6.4 s.\nThe emission is seen up to ~2 MeV.\n\nThe Konus-Wind light curve of this GRB is available at\nhttp://www.ioffe.ru/LEA/GRBs/GRB160521_T33237/\n\nAs observed by Konus-Wind, the burst\nhad a fluence of 1.32(-0.15,+0.17)x10^-5 erg/cm2,\nand a 64-ms peak flux, measured from T0+1.504 s,\nof 1.01(-0.14,+0.14)x10^-5 erg/cm2/s\n(both in the 20 keV - 10 MeV energy range).\n\nThe time-averaged spectrum of the burst\n(measured from T0 to T0+9.984 s)\nis best fit in the 20 keV - 2 MeV range\nby the GRB (Band) model with the following parameters:\nthe low-energy photon index alpha = -0.65(-0.14,+0.16),\nthe high energy photon index beta = -2.72(-0.49,+0.26),\nthe peak energy Ep = 165(-16,+17) keV\n(chi2 = 49/61 dof)\n\nThe spectrum near the maximum count rate\n(measured from T0+0.256 to T0+1.792 s)\nis best fit in the 20 keV - 2 MeV range\nby the GRB (Band) model with the following parameters:\nthe low-energy photon index alpha = -0.43(-0.12,+0.14),\nthe high energy photon index beta = -3.62(-6.38,+0.62),\nthe peak energy Ep = 190(-15,+15) keV\n(chi2 = 56/50 dof)\n\nAll the quoted errors are at the 90% confidence level.\nAll the quoted values are preliminary.",
  "circularId": 19462,
  "createdOn": 1464180814000,
  "email": "ann_kozlova@mail.ioffe.ru",
  "subject": "Konus-Wind observation of GRB 160521B",
  "submitter": "Anna Kozlova at Ioffe Institute  <ann_kozlova@mail.ioffe.ru>",
  "eventId": "GRB 160521B"
}