{
  "bibcode": "2018GCN.22548....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 180316A\n(Swift detection of a burst: Melandri et al., GCN 22500;\nCummings et al., GCN 22512)\ntriggered Konus-Wind at T0=17845.869 s UT (04:57:25.869).\n\nThe burst light curve shows a single emission episode\nwhich starts at ~T0-13 s and has a total duration of ~29 s.\nThe emission is seen up to ~1.2 MeV.\n\nAs observed by Konus-Wind, the burst\nhad a fluence of 1.43(-0.21,+0.38)x10^-5 erg/cm2,\nand a 64-ms peak energy flux, measured from T0+2.976 s,\nof 2.77(-1.16,+1.49)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+16.640 s)\nis best fit in the 20 keV - 1.2 MeV range\nby a power law with exponential cutoff model:\ndN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep)\nwith�� alpha = -1.23(-0.23,+0.27),\nand Ep = 439(-139,+424) keV (chi2 = 74/60 dof).\nFitting by the GRB (Band) model yields the same alpha and Ep,\nand an upper limit on the high energy photon index:\nbeta < -1.87 (chi2 = 74/59 dof).\n\nThe spectrum near the peak 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 = -1.19(-0.22,+0.26),\nand Ep = 498(-165,+498) keV (chi2 = 54/61 dof).\nFitting by the GRB (Band) model yields the same alpha and Ep,\nand an upper limit on the high energy photon index:\nbeta < -1.75 (chi2 = 53/60 dof).\n\nThe Konus-Wind light curve of this GRB is available at\nhttp://www.ioffe.ru/LEA/GRBs/GRB180316_T17845/\n\nAll the quoted errors are at the 90% confidence level.\nAll the quoted values are preliminary.",
  "circularId": 22548,
  "createdOn": 1522077045000,
  "email": "tsvetkova@mail.ioffe.ru",
  "subject": "Konus-Wind observation of GRB 180316A",
  "submitter": "Anastasia Tsvetkova at Ioffe Institute  <tsvetkova@mail.ioffe.ru>",
  "eventId": "GRB 180316A"
}