{
  "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\nAssuming the spectrum and the observer-frame energetics of the very bright\nGRB 250407A (GCN 40104) measured by Konus-Wind (GCN 40121); the redshift z=1.36\n(Schneider et al., GCNs 40175); and a standard cosmology with H_0 = 67.3 km/s/Mpc,\nOmega_M = 0.315, and Omega_Lambda = 0.685 (Planck Collaboration, 2014);\nwe estimate the burst isotropic energy release E_iso to (7.86 ± 0.20)x10^53 erg,\nthe isotropic peak luminosity L_iso to (1.66 ± 0.06)x10^54 erg/s,\nthe rest-frame peak energy of the time-integrated spectrum Ep,i,z to (1530 ± 110) keV,\nand the rest-frame peak energy at the peak of the emission Ep,p,z to (1970 ± 250) keV.\n\nWith the obtained estimates, GRB 250407A is among 10 most luminous (and 50 most energetic)\nGRBs detected by Konus-Wind.\nThe burst is consistent with 68% prediction bands for both 'Amati' and 'Yonetoku' relations\nderived for the sample of >300 long KW GRBs with known redshifts (Tsvetkova et al., 2017;\nTsvetkova et al., 2021), see http://www.ioffe.ru/LEA/GRBs/GRB250407_T56895/GRB250407A_rest_frame.pdf\n\nAll the quoted errors are estimated at the 68% confidence level.\nAll the presented results are preliminary.\n",
  "submitter": "Dmitry Frederiks at Ioffe Institute <fred@mail.ioffe.ru>",
  "subject": "GRB 250407A: rest-frame energetics from Konus-Wind observation",
  "eventId": "GRB 250407A",
  "circularId": 40177,
  "submittedHow": "email",
  "bibcode": "2025GCN.40177....1F",
  "createdOn": 1745071941277
}