{
  "bibcode": "2023GCN.33511....1R",
  "body": "A. Ridnaia, D. Frederiks, A. Lysenko, D. Svinkin,\nA. Tsvetkova,  M. Ulanov, and T. Cline,\non behalf of the Konus-Wind team, report:\n\nThe long-duration GRB 230309A\n(AstroSat CZTI detection: Waratkar et al., GCN Circ. 33464;\nIPN triangulation: Kozyrev et al., GCN Circ. 33484)\ntriggered Konus-Wind at T0=45138.667 s UT (12:32:18.667).\n\nThe burst light curve shows a multipeaked structure\nwhich starts at ~T0-6.1 s and has a total duration of ~68.9 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/GRB230309_T45138/\n\nAs observed by Konus-Wind, the burst\nhad a fluence of 1.69(-0.11,+0.12)x10^-4 erg/cm2,\nand a 64-ms peak flux, measured from T0+3.232 s,\nof 3.12(-0.39,+0.40)x10^-5 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+62.976 s)\nis best fit in the 20 keV - 10 MeV range\nby the GRB (Band) model with the following parameters:\nthe low-energy photon index alpha = -0.80(-0.07,+0.08),\nthe high energy photon index beta = -2.27(-0.15,+0.11),\nthe peak energy Ep = 305(-25,+29) keV\n(chi2 = 96/97 dof).\n\nThe spectrum near the maximum count rate\n(measured from T0+2.816 to T0+3.584 s)\nis best fit in the 20 keV - 10 MeV range\nby the GRB (Band) model with the following parameters:\nthe low-energy photon index alpha = -0.55(-0.10,+0.12),\nthe high energy photon index beta = -2.80(-0.63,+0.31),\nthe peak energy Ep = 483(-64,+66) keV\n(chi2 = 57/55 dof).\n\nAll the quoted errors are at the 90% confidence level.\nAll the quoted values are preliminary.",
  "circularId": 33511,
  "createdOn": 1679577256000,
  "email": "ridnaia@mail.ioffe.ru",
  "subject": "Konus-Wind detection of GRB 230309A",
  "submitter": "Anna Ridnaia at Ioffe Institute  <ridnaia@mail.ioffe.ru>",
  "eventId": "GRB 230309A"
}