{
  "createdOn": 1694447898753,
  "body": "D. Frederiks, A.Lysenko, A. Ridnaia, D. Svinkin,\nA. Tsvetkova,  M. Ulanov, and T. Cline,\non behalf of the Konus-Wind team, report:\n\nThe long GRB 230911D (Fermi GBM team, GCN 34656)\ntriggered Konus-Wind (KW) at T0=28387.687 s UT (07:53:07.687).\n\nThe burst light curve shows a bright, multi-peaked emission complex,\nwhich starts at ~T0-3 s, peaks at ~T0+15 s,\nand has a total duration of ~60 s.\nThe emission is seen up to ~5 MeV.\n\nThe Konus-Wind light curve of this GRB is available at\nhttp://www.ioffe.ru/LEA/GRBs/GRB230911_T28387/\n\nAs observed by Konus-Wind, the burst had\na fluence of (1.57 ± 0.12)x10^-4 erg/cm^2 and\na 64-ms peak energy flux, measured from T0 + 14.848 s,\nof (1.42 ± 0.15)x10^-5 erg/cm^2/s (both in the 20 keV - 10 MeV energy range).\n\nThe time-integrated spectrum (measured from T0 to T0+54.272 s)\nis best fit in the 20 keV - 15 MeV range\nby a GRB (Band) function with the following model parameters:\nthe low-energy photon index alpha = -0.74 (-0.06,+0.06),\nthe high energy photon index beta = -2.44 (-0.28,+0.17),\nthe peak energy Ep = 343 (-22,+23) keV,\nchi2 = 126/96 dof.\n\nThe spectrum near the peak count rate (measured from T0+14.336 to T0+16.384 s)\nis best fit in the 20 keV - 15 MeV range\nby a GRB (Band) function with the following model parameters:\nthe low-energy photon index alpha = -0.13 (-0.16,+0.18),\nthe high energy photon index beta = -2.56 (-0.32,+0.21),\nthe peak energy Ep = 405 (-43,+48) keV,\nchi2 = 95/73 dof.\n\nAll the quoted errors are estimated at the 90% confidence level.\nAll the presented results are preliminary.\n\n",
  "circularId": 34659,
  "submitter": "Dmitry Frederiks at Ioffe Institute <fred@mail.ioffe.ru>",
  "subject": "Konus-Wind detection of GRB 230811D",
  "bibcode": "2023GCN.34659....1F",
  "eventId": "GRB 230811D",
  "submittedHow": "email-legacy"
}