{
  "eventId": "GRB 261113A",
  "submittedHow": "email",
  "circularId": 46268,
  "subject": "Konus-Wind detection of GRB 261113A",
  "createdOn": 1794654285274,
  "submitter": "Dmitry Frederiks at Ioffe Institute <fred@mail.ioffe.ru>",
  "body": "D. Frederiks, A.Lysenko, A. Ridnaia, D. Svinkin,\nA. Tsvetkova,  M. Ulanov, and T. Cline,\non behalf of the Konus-Wind team, report:\n\nGRB 261113A (SVOM detection: Saccardi et al., GCN 46244)\ntriggered Konus-Wind (KW) at T0=52263.795 s UT (14:31:03.795).\n\nThe burst light curve shows a mult-peaked structure with the total duration of ~7 s.\nThe emission is seen up to ~700 keV.\n\nThe Konus-Wind light curve of this GRB is available at\nhttp://www.ioffe.ru/LEA/GRBs/GRB261113_T52263/\n\nAs observed by Konus-Wind, the burst had the total fluence\nof (3.51 ± 0.61)x10^-6 erg/cm^2 and a 16-ms peak energy flux,\nmeasured from T0, of (1.36 ± 0.24)x10^-6 erg/cm^2/s\n(both in the 20 keV - 10 MeV energy range).\n\nThe spectrum of the burst (measured from T0 to T0+8.448 s)\nis best fitted in the 20 keV - 15 MeV range by a power law with exponential\ncutoff (CPL) model dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep)\nwith alpha = -0.81 (-0.30, + 0.33) and Ep = 106(-9,+10) keV, PGstat = 49/60 dof.\nFitting this spectrum by a Band GRB function yields the same values\nof alpha and Ep, and an upper limit on the high energy photon index beta of -3.1\n\nAssuming the redshift z=3.580 (Saccardi et al., GCN 46261)\nand a standard cosmology with H_0 = 67.3 km/s/Mpc, Omega_M = 0.315,\nand Omega_Lambda = 0.685 (Planck Collaboration, 2014),\nwe estimate the burst isotropic energy release E_iso to (9.49 ± 1.65)x10^52 erg,\nthe isotropic peak luminosity L_iso to (1.68 ± 0.29)x10^53 erg/s, and\nthe rest-frame peak spectral energy Ep,z to (485 ± 43) keV.\nWith the obtained estimates, GRB 261113A is consistent with 68% prediction bands\nfor both 'Amati' and  'Yonetoku' relations for the sample of >300 long KW GRBs\nwith known redshifts (Tsvetkova et al., 2017; Tsvetkova et al., 2021),\nsee http://www.ioffe.ru/LEA/GRBs/GRB261113_T52263/GRB261113A_rest_frame.pdf\n\nAll the quoted errors are estimated at the 68% confidence level.\nAll the presented results are preliminary."
}