{
  "bibcode": "2017GCN.21679....1S",
  "body": "D. Svinkin, S. Golenetskii, R. Aptekar, D. Frederiks, P. Oleynik,\nM. Ulanov, A. Tsvetkova, A. Lysenko, A.Kozlova, and T. Cline\non behalf of the Konus-Wind team, report:\n\nThe long-duration, soft-spectrum GRB 170822A\n(Swift-BAT detection: Melandri et al., GCN Circ. 21640)\ntriggered Konus-Wind at T0=33111.022 s UT (09:11:51.022).\n\nThe burst light curve shows a multipeaked structure\nwhich starts at ~T0-10.5 s and has a total duration of ~62 s.\nThe emission is seen up to ~1 MeV.\n\nThe Konus-Wind light curve of this GRB is available at\nhttp://www.ioffe.ru/LEA/GRBs/GRB170822_T33111/\n\nAs observed by Konus-Wind, the burst\nhad a fluence of 8.57(-0.76,+0.88)x10^-6 erg/cm2,\nand a 64-ms peak flux, measured from T0+0.266 s,\nof 1.66(-0.60,+0.60)x10^-6 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+57.6 s)\nis best fit in the 20 keV - 2 MeV range\nby a power law with exponential cutoff model:\ndN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep)\nwith  alpha = -1.20(-0.38,+0.48)\nand Ep = 70(-12,+12) keV (chi2 = 57/62 dof).\nFitting by a GRB (Band) model yields the same alpha and Ep,\nand an upper limit on the high energy photon index: beta < -2.4\n(chi2 = 55/61 dof).\n\nThe spectrum near the maximum count rate\n(measured from T0 to T0+8.448 s)\nis best fit in the 20 keV - 2 MeV range\nby a power law with exponential cutoff model:\nwith  alpha = -1.17(-0.26,+0.30)\nand Ep = 90(-11,+13) keV (chi2 = 51/61 dof).\nFitting by a GRB (Band) model yields the same alpha and Ep,\nand an upper limit on the high energy photon index: beta < -2.8\n(chi2 = 51/60 dof).\n\nAll the quoted errors are at the 90% confidence level.\nAll the quoted values are preliminary.",
  "circularId": 21679,
  "createdOn": 1503589412000,
  "email": "svinkin@mail.ioffe.ru",
  "subject": "Konus-Wind observation of GRB 170822A",
  "submitter": "Dmitry Svinkin at Ioffe Institute  <svinkin@mail.ioffe.ru>",
  "eventId": "GRB 170822A"
}