{
  "submittedHow": "web",
  "submitter": "Anna Ridnaia at Ioffe Institute <ridnaia@mail.ioffe.ru>",
  "eventId": "GRB 240402B",
  "subject": "LXT 240402A/GRB 240402B: rest-frame energetics from Konus-Wind observation",
  "bibcode": "2024GCN.36041....1R",
  "circularId": 36041,
  "body": "A. Ridnaia, D. Frederiks, A. Lysenko, 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 GRB 240402B\nmeasured by KW (GCN 36028); the redshift of the probable host galaxy\nz=0.047 (Xu et al., GCN 36016; Levan et al., GCN 36025; Xue at al., GCN 36034);\nand 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 (4.06 ± 0.27)x10^49 erg,\nthe isotropic peak luminosity L_iso to (2.85 ± 0.38)x10^49 erg/s,\nthe rest-frame peak energy of the time-integrated spectrum Ep,i,z to (90 ± 5) keV.\n\nWith the obtained estimates, GRB 240402B is a low-luminosity outlier\nin 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/GRB240402_T31668/GRB240402B_rest_frame.pdf\n\nAll the quoted errors are estimated at the 90% confidence level.\nAll the presented results are preliminary.",
  "createdOn": 1712415285024
}