{
  "bibcode": "2021GCN.30007....1R",
  "body": "A. Ridnaia, D. Frederiks, S. Golenetskii, A. Lysenko, D. Svinkin,\nA. Tsvetkova,  M. Ulanov, and T. Cline, report:\n\nThe long-duration GRB 210511B\n(Fermi GBM detection: Fermi GBM team, GCN 29988;\nBissaldi and Meegan, GCN 29996;\nBALROG localization: Kunzweiler et al., GCN 29989;\nGECAM detection: Cai et al., GCN 29990;\nAGILE detection: Ursi et al., GCN 29991;\nIPN triangulation: Hurley et al., GCN 30002)\ntriggered Konus-Wind at T0=41201.35 s UT (11:26:41.350).\n\nThe burst light curve shows a multi-peaked structure\nwhich starts at ~T0-1.7 s and has a total duration of ~6 s.\nThe emission is seen up to ~4 MeV.\n\nThe Konus-Wind light curve of this GRB is available at\nhttp://www.ioffe.ru/LEA/GRBs/GRB210511_T41201/\n\nAs observed by Konus-Wind, the burst\nhad a fluence of 1.10(-0.15,+0.18)x10^-5 erg/cm2,\nand a 64-ms peak flux, measured from T0+0.512 s,\nof 4.76(-1.24,+1.34)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+8.448 s)\nis best fit in the 20 keV - 4 MeV range\nby the GRB (Band) model with the following parameters:\nthe low-energy photon index alpha = -0.98(-0.15,+0.18),\nthe high energy photon index beta = -2.48(-0.43,+0.23),\nthe peak energy Ep = 154(-22,+25) keV\n(chi2 = 86/71 dof).\n\nAll the quoted errors are at the 90% confidence level.\nAll the quoted values are preliminary.",
  "circularId": 30007,
  "createdOn": 1620938900000,
  "email": "ridnaia@mail.ioffe.ru",
  "subject": "Konus-Wind detection of GRB 210511B",
  "submitter": "Anna Ridnaia at Ioffe Institute  <ridnaia@mail.ioffe.ru>",
  "eventId": "GRB 210511B"
}