{
  "body": "D. Svinkin, D. Frederiks, M. Ulanov, A. Tsvetkova,\nA. Lysenko, A. Ridnaia, and T. Cline\non behalf of the Konus-Wind team, report:\n\nThe short-duration GRB 230418A\n(Fermi-GBM detection: Roberts et al., GCN Circ. 33652;\nSwift/BAT-GUANO detection: Ronchini et al., GCN Circ. 33653;\nAGILE detection: Panebianco et al., GCN Circ. 33656;\nAstroSat-CZTI detection: Navaneeth et al., GCN Circ. 33657;\nIPN triangulation: Kozyrev et al., GCN Circ. 33659)\ntriggered Konus-Wind at T0=76289.941 s UT (21:11:29.941).\n\nThe burst light curve shows a multi-peaked structure\nwhich starts at ~T0 s and has a total duration of ~0.3 s.\nThe emission is seen up to ~2 MeV.\n\nThe Konus-Wind light curve of this GRB is available at\nhttp://www.ioffe.ru/LEA/GRBs/GRB230418_T76289/\n\nAs observed by Konus-Wind, the burst\nhad a fluence of 4.13(-0.64,+0.76)x10^-6 erg/cm2,\nand a 16-ms peak flux, measured from T0+0.048 s,\nof 3.84(-1.00,+1.10)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+0.192 s)\nis best fit in the 20 keV - 2 MeV range\nby a power law with exponential cutoff model:\ndN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep)\nwith alpha = -0.52(-0.20,+0.23)\nand Ep = 1071(-228,+335) keV (chi2 = 16/24 dof).\nFitting by a GRB (Band) model yields the same alpha and Ep,\nand an upper limit on the high energy photon index: beta < -1.87\n(chi2 = 16/23 dof).\n\nAll the quoted errors are at the 90% confidence level.\nAll the quoted values are preliminary.\n\n",
  "subject": "Konus-Wind detection of GRB 230418A",
  "circularId": 33674,
  "eventId": "GRB 230418A",
  "createdOn": 1682181166111,
  "submitter": "Dmitry Svinkin at Ioffe Institute <svinkin@mail.ioffe.ru>",
  "bibcode": "2023GCN.33674....1S"
}