{
  "bibcode": "2018GCN.22770....1T",
  "body": "A. Tsvetkova, S. Golenetskii, R.Aptekar, D. Frederiks,\nM. Ulanov, D. Svinkin, A. Lysenko, A. Kozlova and T. Cline\non behalf of the Konus-Wind team, report:\n\nThe long-duration GRB 180611A\n(IPN Triangulation: Hurley et al., GCN 22767;\nFermi GBM observation: Bissaldi &�� Meegan, GCN 22768)\ntriggered Konus-Wind at T0=12541.046 s UT (03:29:01.046).\n\nThe burst light curve shows several peaks with a total duration of ~7 s.\nThe emission is seen up to ~1.5 MeV.\n\nAs observed by Konus-Wind, the burst\nhad a fluence of 4.61(-0.56,+0.72)x10^-6 erg/cm2,\nand a 64-ms peak energy flux, measured from T0+0.148 s,\nof 5.04(-2.18,+3.14)x10^-6 erg/cm2/s\n(both in the 20 keV - 10 MeV energy range).\n\nThe time-integrated spectrum of the burst\n(measured from T0 to T0+8.448 s)\nis best fit in the 20 keV - 1.5 MeV range\nby a power law with exponential cutoff model:\ndN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep)\nwith�� alpha = -0.80(-0.26,+0.30),\nand Ep = 250(-47,+77) keV (chi2 = 52/60 dof).\nFitting by the GRB (Band) model yields the same alpha and Ep,\nand an upper limit on the high energy photon index:\nbeta < -2.25 (chi2 = 52/59 dof).\n\nThe spectrum near the peak count rate\n(measured from T0 to T0+0.256 s)\nis best fit in the 20 keV - 20 MeV range\nby the power law with exponential cutoff model\nwith�� alpha = -1.05(-0.29,+0.38),\nand Ep = 668(-304,+856) keV (chi2 = 23/19 dof).\nFitting by the GRB (Band) model yields the same alpha and Ep,\nand an upper limit on the high energy photon index:\nbeta < -1.80 (chi2 = 23/18 dof).\n\nThe Konus-Wind light curve of this GRB is available at\nhttp://www.ioffe.ru/LEA/GRBs/GRB180611_T12541/\n\nAll the quoted errors are at the 90% confidence level.\nAll the quoted values are preliminary.",
  "circularId": 22770,
  "createdOn": 1528906191000,
  "email": "tsvetkova@mail.ioffe.ru",
  "subject": "Konus-Wind observation of GRB 180611A",
  "submitter": "Anastasia Tsvetkova at Ioffe Institute  <tsvetkova@mail.ioffe.ru>",
  "eventId": "GRB 180611A"
}