{
  "bibcode": "2020GCN.28495....1T",
  "body": "A. Tsvetkova, S. Golenetskii, R.Aptekar, D. Frederiks,\nM. Ulanov, D. Svinkin, A. Lysenko, A. Ridnaia and T. Cline\non behalf of the Konus-Wind team, report:\n\nThe long-duration, hard-spectrum GRB 200914A\n(Integral detection: Mereghetti et al., GCN 28419;\nFermi GBM observation: Dunwoody et al., GCN 28424;\nAGILE detection: Ursi et al., GCN 28426)\ntriggered Konus-Wind at T0=46113.769 s UT (12:48:33.769).\n\nThe burst light curve shows a single pulse\nwhich starts at ~T0-2.4 s and has a total duration of~38.0 s\nThe emission is seen up to ~2 MeV.\n\nAs observed by Konus-Wind, the burst\nhad a fluence of 4.26(-0.96,+1.08)x10^-5 erg/cm2,\nand a 64-ms peak energy flux, measured from T0+0.306 s,\nof 8.12(-2.44,+2.55)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+33.024 s)\nis best fit in the 20 keV - 20 MeV range\nby the GRB (Band) model with the following parameters:\nthe low-energy photon index alpha = -0.35(-0.34,+0.50),\nthe high energy photon index beta = -2.11(-0.70,+0.28),\nthe peak energy Ep = 461(-128,+201) keV,\nchi2 = 93/97 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 - 1.6 MeV range\nby a power law with exponential cutoff model:\ndN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep)\nwith�� alpha = -0.58(-0.16,+0.19),\nand Ep = 935(-170,+228) keV (chi2 = 86/98 dof).\nFitting by the GRB (Band) model yields the same alpha and Ep,\nand an upper limit on the high energy photon index:\nbeta < -2.51 (chi2 = 86/97 dof).\n\nThe Konus-Wind light curve of this GRB is available at\nhttp://www.ioffe.ru/LEA/GRBs/GRB200914_T46113/\n\nAll the quoted errors are at the 90% confidence level.\nAll the quoted values are preliminary.",
  "circularId": 28495,
  "createdOn": 1601044143000,
  "email": "tsvetkova@mail.ioffe.ru",
  "subject": "Konus-Wind observation of GRB 200914A",
  "submitter": "Anastasia Tsvetkova at Ioffe Institute  <tsvetkova@mail.ioffe.ru>",
  "eventId": "GRB 200914A"
}