{
  "bibcode": "2019GCN.25285....1K",
  "body": "A. Kozlova, S. Golenetskii, R. Aptekar, D. Frederiks,\nM. Ulanov, D. Svinkin, A. Tsvetkova, A. Lysenko, and T. Cline\non behalf of the Konus-Wind team, report:\n\nThe long-duration GRB 190805B\n(MAXI/GSC detection: Sato et al., GCN Circ. 25271;\nFermi/GBM detection: Hamburg & Meegan, GCN Circ. 25277)\ntriggered Konus-Wind at T0=17159.354 s UT (04:45:59.354).\n\nThe burst light curve shows a multipeaked structure\nwhich starts at ~T0-6.1 s and has a total duration of ~27.9 s.\nThe emission is seen up to ~6 MeV.\n\nAs observed by Konus-Wind, the burst\nhad a fluence of 1.46(-0.16,+0.24)x10^-5 erg/cm2,\nand a 64-ms peak flux, measured from T0+14.832 s,\nof 4.76(-1.60,+8.56)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+24.832 s)\nis best fit in the 20 keV - 6 MeV range\nby a power law with exponential cutoff model:\ndN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep)\nwith  alpha = -1.07(-0.23,+0.26)\nand Ep = 315(-73,+148) keV (chi2 = 66/79 dof).\nFitting by a GRB (Band) model yields the same alpha and Ep,\nand an upper limit on the high energy photon index: beta < -2.0\n(chi2 = 65/78 dof).\n\nThe spectrum near the maximum count rate\n(measured from T0+8.448 to T0+16.640 s)\nis best fit in the 20 keV - 6 MeV range\nby a power law with exponential cutoff model\nwith  alpha = -1.28(-0.44,+0.55)\nand Ep = 281(-118,-281) keV (chi2 = 45/78 dof).\nFitting by a GRB (Band) model yields the same alpha and Ep,\nand an upper limit on the high energy photon index: beta < -1.7\n(chi2 = 44/77 dof).\n\nThe Konus-Wind light curve of this GRB is available at\nhttp://www.ioffe.ru/LEA/GRBs/GRB190805_T17159/\n\nAll the quoted errors are at the 90% confidence level.\nAll the quoted values are preliminary.",
  "circularId": 25285,
  "createdOn": 1565242930000,
  "email": "ann_kozlova@mail.ioffe.ru",
  "subject": "Konus-Wind observation of GRB 190805B",
  "submitter": "Anna Kozlova at Ioffe Institute  <ann_kozlova@mail.ioffe.ru>",
  "eventId": "GRB 190805B"
}