{
  "bibcode": "2020GCN.28304....1R",
  "body": "A. Ridnaia, 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, very bright GRB 200826B\n(Fermi-GBM detection: The Fermi GBM Team, GCN Circ. 28292;\nMalacaria & Meegan, GCN Circ. 28298;\nIPN triangulation: Hurley et al., GCN Circ. 28303)\ntriggered Konus-Wind at T0=79779.087 s UT (22:09:39.087).\n\nThe burst light curve shows a bright, multi-peaked pulse\nwhich started at ~T0-3 s and had a total duration of ~23 s.\nA weak post-burst emission is visible in the 18-70 keV band\nup to the end of the KW trigger record at ~T0+250 s.\nThe emission is seen up to ~10 MeV.\n\nThe Konus-Wind light curve of this GRB is available at\nhttp://www.ioffe.ru/LEA/GRBs/GRB200826_T79779/\n\nAs observed by Konus-Wind, the burst had\na fluence of (2.0 �� 0.1)x10^-4 erg/cm^2 and\na 64-ms peak energy flux, measured from T0+4.922,\nof (4.8 �� 0.4)x10^-5 erg/cm^2/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+17.408 s)\ncan be described, in the 20 keV - 15 MeV range,\nby the GRB (Band) function with the following model parameters:\nthe low-energy photon index alpha = -0.54 (-0.04,+0.04),\nthe high energy photon index beta = -2.38 (-0.07,+0.06),\nthe peak energy Ep = 337 (-14,+15) keV,\nchi2 = 169/96 dof.\n\nThe spectrum near the peak count rate\n(measured from T0+4.864 to T0+5.120 s)\nis best fit in the 20 keV - 15 MeV range by the GRB (Band)\nfunction with the following model parameters:\nthe low-energy photon index alpha = -0.18 (-0.18,+0.22),\nthe high energy photon index beta = -2.42 (-0.23,+0.17),\nthe peak energy Ep = 320 (-45,+48) keV,\nchi2 = 58/48 dof.\n\nAll the quoted errors are at the 90% confidence level.\nAll the quoted values are preliminary.",
  "circularId": 28304,
  "createdOn": 1598647609000,
  "email": "ridnaia@mail.ioffe.ru",
  "subject": "Konus-Wind detection of GRB 200826B",
  "submitter": "Anna Ridnaia at Ioffe Institute  <ridnaia@mail.ioffe.ru>",
  "eventId": "GRB 200826B"
}