{
  "format": "text/plain",
  "createdOn": 1790101040299,
  "eventType": [
    "GRB",
    "Gamma-ray Transient"
  ],
  "submitter": "Valentina Panteleeva at Ioffe Institute <panteleevav228@gmail.com>",
  "subject": "Konus-Wind detection of GRB 260810A",
  "circularId": 45694,
  "body": "V. Panteleeva, D. Frederiks, A. Lysenko, A. Ridnaia, D. Svinkin,\nA. Tsvetkova,  M. Ulanov, and T. Cline,\non behalf of the Konus-Wind team, report:\n\nThe long-duration GRB 260810A\n(AstroSat-CZTI detection: Arya et al., GCN 45363;\nGlowbug detection: Cheung et al., GCN 45365;\nInsight-HXMT-HE detection: Yu et al., GCN 45392;\nSVOM-GRM observation: Guo et  al., GCN 45402;\nIPN triangulation: Kozyrev et al., GCN 45627)\ntriggered Konus-Wind at T0=68985.874 s UT (19:09:45.874).\n\nThe burst light curve shows a multipeaked structure\nwhich starts at ~T0-0.4 s and has a total duration of ~26.3 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/GRB260810_T68985/\n\nAs observed by Konus-Wind, the burst\nhad the total fluence of 4.95(-0.28,+0.29)x10^-5 erg/cm2,\nand the 64-ms peak flux, measured from T0+9.216 s,\nof 1.03(-0.10,+0.10)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+25.856 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 = -0.99(-0.09,+0.10),\nthe high energy photon index beta = -2.08(-0.06,+0.05),\nthe peak energy Ep = 187(-19,+20) keV\n(chi2 = 70/97 dof).\n\nThe spectrum near the maximum count rate\n(measured from T0+2.304 to T0+9.472 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 = -1.14(-0.09,+0.10),\nthe high energy photon index beta = -2.46(-0.12,+0.09),\nthe peak energy Ep = 129(-9,+10) keV\n(chi2 = 56/79 dof).\n\nAll the quoted errors are at the 68% confidence level.\nAll the quoted values are preliminary.",
  "submittedHow": "web",
  "eventId": "GRB 260810A"
}