{
  "subject": "Konus-Wind detection of GRB 260922A",
  "format": "text/plain",
  "submitter": "Anna Ridnaia at Ioffe Institute <ridnaia@mail.ioffe.ru>",
  "body": "A. Ridnaia, D. Frederiks, A. Lysenko, V. Panteleeva,\nD. Svinkin, A. Tsvetkova,  M. Ulanov, and T. Cline,\non behalf of the Konus-Wind team, report:\n\nThe long-duration GRB 260922A\n(Swift detection: Page et al., GCN 45690;\nSakamoto et al., GCN 45703;\nCALET-GBM detection: Ricciarini et al., GCN 45716;\nNuSTAR detection: Waratkar & Grefenstette, GCN 45728)\ntriggered Konus-Wind at T0=36035.366 s UT (10:00:35.366).\n\nThe burst light curve shows a multi-peaked emission pulse,\nwhich starts at ~T0-3.5 s and has a total duration of ~15.6 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/GRB260922_T36035/\n\nAs observed by Konus-Wind, the burst\nhad the total fluence of 6.88(-0.28,+0.29)x10^-6 erg/cm2,\nand the 64-ms peak flux, measured from T0+1.552 s,\nof 2.15(-0.35,+0.35)x10^-6 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+16.640 s)\nis best fit in the 20 keV - 10 MeV range\nby a power law with exponential cutoff model:\ndN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep)\nwith alpha = -0.31(-0.19,+0.21)\nand Ep = 151(-9,+10) keV (chi2 = 101/98 dof).\nFitting by a GRB (Band) model yields the same alpha and Ep,\nand an upper limit on the high energy photon index: beta < -2.6\n(chi2 = 101/97 dof).\n\nThe spectrum near the maximum count rate\n(measured from T0+0.256 to T0+8.448 s)\nis best fit in the 20 keV - 10 MeV range\nby a power law with exponential cutoff model:\ndN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep)\nwith alpha = -0.39(-0.15,+0.16)\nand Ep = 153(-8,+8) keV (chi2 = 63/83 dof).\nFitting by a GRB (Band) model yields the same alpha and Ep,\nand an upper limit on the high energy photon index: beta < -2.9\n(chi2 = 62/82 dof).\n\nAll the quoted errors are at the 68% confidence level.\nAll the quoted values are preliminary.",
  "circularId": 45729,
  "eventId": "GRB 260922A",
  "eventType": [
    "GRB",
    "Gamma-ray Transient"
  ],
  "submittedHow": "web",
  "createdOn": 1790267869839
}