{
  "bibcode": "2021GCN.29564....1F",
  "body": "D. Frederiks, S. Golenetskii, A.Lysenko, D. Svinkin,\nA. Ridnaya, A. Tsvetkova,  M. Ulanov, and T. Cline, report:\n\nThe long GRB 210222A (MAXI/GSC detection: Nakajima et al., GCN 29543;\nCALET Gamma-Ray Burst Monitor detection: Marrocchesi et al., GCN 29553)\nwas detected by Konus-Wind (KW) in the waiting mode starting from\n~T0 = 57443.990 (15:57:23.990) UT (or ~2 minutes before the MAXI trigger).\n\nA Bayesian block analysis of the KW waiting mode data in the 20-400 keV band\nreveals a ~30 sigma count rate increase over background in the interval\nfrom ~T0 to ~T0+177 s.\nThe KW light curve of this burst is available\nat http://www.ioffe.ru/LEA/GRBs/GRB210222A/\n\nModeling the KW 3-channel time-integrated spectrum\n(measured from T0+0.115 s to T0+176.755 s)\nby a power law with exponential cutoff (CPL) model\ndN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep)\nyields alpha = -1.33(-0.11,+0.15) and Ep = 317(-72,+108) keV.\n\nA CPL fit to the spectrum near the peak count rate,\nmeasured from T0+0.115 s to T0+14.835 s, gives\nalpha -0.48(-0.14,+0.15), and Ep of 375(-40,+40) keV.\n\nIn the 10 keV -10 MeV band, the total burst fluence is (4.2 �� 0.6)x10^-5 erg/cm^2,\nand the 2.944 s peak energy flux is (9.3 �� 0.8)x10^-7 erg/cm^2.\n\nAll the quoted errors are estimated at the 68% confidence level.\nAll the presented results are preliminary.",
  "circularId": 29564,
  "createdOn": 1614178972000,
  "email": "fred@mail.ioffe.ru",
  "subject": "Konus-Wind detection of GRB 210222A",
  "submitter": "Dmitry Frederiks at Ioffe Institute  <fred@mail.ioffe.ru>",
  "eventId": "GRB 210222A"
}