{
  "bibcode": "2022GCN.31802....1T",
  "body": "A. Tsvetkova,�� D. Frederiks, D. Svinkin,\nM. Ulanov, A. Lysenko, A. Ridnaia and T. Cline\non behalf of the Konus-Wind team, report:\n\nThe long-duration, bright GRB 220320A\n(AstroSat CZTI detection: Gopalakrishnan et al., GCN 31779;\nIPN triangulation: Kozyrev et al., GCN 31783)\ntriggered Konus-Wind at T0=16796.141 s UT (04:39:56.141).\n\nThe burst light curve shows a multi-peaked structure\nwhich starts at ~T0-18.8 s and has a total duration of~52.8 s\nThe emission is seen up to ~20 MeV.\n\nAs observed by Konus-Wind, the burst\nhad a fluence of 6.05(-0.50,+0.52)x10^-5 erg/cm2,\nand a 64-ms peak energy flux, measured from T0+4.048 s,\nof 2.50(-0.34,+0.34)x10^-5 erg/cm2/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+20.480 s)\nis best fit in the 20 keV - 20 MeV range\nby the GRB (Band) model with the following parameters:\nthe low-energy photon index alpha = -0.84(-0.09,+0.10),\nthe high energy photon index beta = -2.27(-0.15,+0.11),\nthe peak energy Ep = 224(-21,+24) keV,\nchi2 = 100/97 dof.\n\nThe spectrum near the peak count rate\n(measured from T0 to T0+4.352 s)\nis best fit in the 20 keV - 20 MeV range\nby the GRB (Band) model with the following parameters:\nthe low-energy photon index alpha = -0.43(-0.11,+0.12),\nthe high energy photon index beta = -2.31(-0.17,+0.13),\nthe peak energy Ep = 311(-29,+33) keV,\nchi2 = 67/86 dof.\n\nThe Konus-Wind light curve of this GRB is available at\nhttp://www.ioffe.ru/LEA/GRBs/GRB220320_T16796/\n\nAll the quoted errors are at the 90% confidence level.\nAll the quoted values are preliminary.",
  "circularId": 31802,
  "createdOn": 1648486724000,
  "email": "tsvetkova@mail.ioffe.ru",
  "subject": "Konus-Wind observation of GRB 220320A",
  "submitter": "Anastasia Tsvetkova at Ioffe Institute  <tsvetkova@mail.ioffe.ru>",
  "eventId": "GRB 220320A"
}