{
  "bibcode": "2017GCN.21278....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 170626A (Swift-BAT trigger #758766:\nMarshall et al., GCN 21264; Barthelmy et al., GCN 21271;\nFermi GBM observation: Hamburg et al., GCN 21266;\nInsight-HXMT observation: Xu et al., GCN 21274)\ntriggered Konus-Wind at T0=34640.048 s UT (09:37:20.048).\n\nThe burst light curve shows a multipeaked structure\nstarted at ~T0-0.4 s with a total duration of ~12.8 s.\nThe emission is seen up to ~10 MeV.\n\nAs observed by Konus-Wind, the burst\nhad a fluence of 1.22(-0.05,+0.05)x10^-5 erg/cm2,\nand a 64-ms peak flux, measured from T0+0.576 s,\nof 6.70(-0.97,+0.98)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+15.360 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 = -1.23(-0.10,+0.11)\nand Ep = 110(-7,+8) keV (chi2 = 92/99 dof).\nFitting by a GRB (Band) model yields the same alpha and Ep,\nthe high energy photon index beta = -3.3 (-0.9,+0.4)\n(chi2 = 90/98 dof)\n\nThe spectrum near the maximum count rate\n(measured from T0+0.256 to T0+7.168 s)\nis best fit in the 20 keV - 10 MeV range\nby a power law with exponential cutoff model\nwith  alpha = -1.17(-0.10,+0.11)\nand Ep = 123(-8,+9) keV (chi2 = 78/95 dof).\nFitting by a GRB (Band) model yields the same alpha and Ep,\nthe high energy photon index beta = -3.5 (-3.1,+0.4)\n(chi2 = 77/94 dof)\n\nThe Konus-Wind light curve of this GRB is available at\nhttp://www.ioffe.ru/LEA/GRBs/GRB170626_T34640/\n\nAll the quoted errors are at the 90% confidence level,\nexcept for beta errors, which are at the 68% confidence level.\nAll the quoted values are preliminary.",
  "circularId": 21278,
  "createdOn": 1498654049000,
  "email": "ann_kozlova@mail.ioffe.ru",
  "subject": "Konus-Wind observation of GRB 170626A",
  "submitter": "Anna Kozlova at Ioffe Institute  <ann_kozlova@mail.ioffe.ru>",
  "eventId": "GRB 170626A"
}