{
  "bibcode": "2017GCN.21280....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 170626B\n(Insight-HXMT observation: Liu et al., GCN 21265;\nIPN triangulation: Kozlova et al., GCN 21279)\ntriggered Konus-Wind at T0=3482.215 s UT (00:58:02.215).\n\nThe burst light curve shows a multipeaked structure\nstarted at ~T0-6.1 s with a total duration of ~16.8 s.\nThe emission is seen up to ~10 MeV.\n\nAs observed by Konus-Wind, the burst\nhad a fluence of 4.12(-0.20,+0.22)x10^-5 erg/cm2,\nand a 64-ms peak flux, measured from T0+4.256 s,\nof 1.03(-0.18,+0.18)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+14.592 s)\nis best fit in the 20 keV - 10 MeV range\nby a power law with exponential cutoff model:\ndN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep)\nwith  alpha = -0.59(-0.13,+0.14)\nand Ep = 423(-38,+45) keV (chi2 = 87/99 dof).\nFitting by a GRB (Band) model yields the same alpha and Ep,\nand an upper limit on the high energy photon index: beta < -2.7\n(chi2 = 87/98 dof)\n\nThe spectrum near the maximum count rate\n(measured from T0+0.256 to T0+6.400 s)\nis best fit in the 20 keV - 10 MeV range\nby a power law with exponential cutoff model\nwith  alpha = -0.45(-0.11,+0.12)\nand Ep = 429(-30,+35) keV (chi2 = 91/92 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 = 91/91 dof)\n\nThe Konus-Wind light curve of this GRB is available at\nhttp://www.ioffe.ru/LEA/GRBs/GRB170626_T03482/\n\nAll the quoted errors are at the 90% confidence level.\nAll the quoted values are preliminary.",
  "circularId": 21280,
  "createdOn": 1498659604000,
  "email": "ann_kozlova@mail.ioffe.ru",
  "subject": "Konus-Wind observation of GRB 170626B",
  "submitter": "Anna Kozlova at Ioffe Institute  <ann_kozlova@mail.ioffe.ru>",
  "eventId": "GRB 170626B"
}