{
  "subject": "Konus-Wind detection of GRB 230616A",
  "body": "Y. Temiraev, D. Svinkin, D. Frederiks, M. Ulanov,  \nA. Tsvetkova, A. Lysenko, A. Ridnaia, and T. Cline \non behalf of the Konus-Wind team, report:\n\nThe short-duration, bright GRB 230616A\n(Swift-BAT/GUANO detection: Tohuvavohu et al., GCN Circ. 33982;\nAstroSat-CZTI detection: Waratkar et al., GCN Circ. 33983;\nIPN triangulation: Kozyrev et al., GCN Circ. 34046)\ntriggered Konus-Wind at T0=74278.259 s UT (20:37:58.259).\n\nThe burst light curve shows a multipeaked structure\nwhich starts at ~T0-30 ms and has a total duration of ~98 ms.\nThe emission is seen up to ~7 MeV.\n\nThe Konus-Wind light curve of this GRB is available at\nhttp://www.ioffe.ru/LEA/GRBs/GRB230616_T74278/\n\nAs observed by Konus-Wind, the burst\nhad a fluence of 9.11(-1.11,+1.13)x10^-6 erg/cm2,\nand a 16-ms peak flux, measured from T0+0.028 s,\nof 1.77(-0.32,+0.33)x10^-4 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+0.064 s)\nis best fit in the 20 keV - 7 MeV range\nby a power law with exponential cutoff model:\ndN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep)\nwith alpha = -0.38(-0.15,+0.17)\nand Ep = 1725(-257,+286) keV (chi2 = 63/55 dof).\nFitting by a GRB (Band) model yields the same alpha and Ep,\nand an upper limit on the high energy photon index: beta < -2.7\n(chi2 = 63/54 dof).\n\nAll the quoted errors are at the 90% confidence level.\nAll the quoted values are preliminary.",
  "submitter": "Y. Temiraev at Ioffe Institute <yuri.temiraev@mail.ioffe.ru>",
  "createdOn": 1687877453932,
  "eventId": "GRB 230616A",
  "bibcode": "2023GCN.34091....1T",
  "circularId": 34091
}