{
  "circularId": 36830,
  "bibcode": "2024GCN.36830....1R",
  "eventId": "GRB 240627A",
  "submittedHow": "web",
  "subject": "Konus-Wind detection of GRB 240627A",
  "createdOn": 1720192785832,
  "format": "text/plain",
  "submitter": "Anna Ridnaia at Ioffe Institute <ridnaia@mail.ioffe.ru>",
  "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\nThe long-duration GRB 240627A\n(AstroSat-CZTI detection: Joshi et al., GCN 36776;\nNuSTAR anti-coincidence shields detection: Grefenstette, GCN 36778;\nCALET-CGBM detection: Kobayashi et al., GCN 36798;\nIPN triangulation: Kozyrev et al., GCN 36814;)\ntriggered Konus-Wind at T0=86332.21 s UT (23:58:52.210).\n\nThe burst light curve shows a multipeaked structure\nwhich starts at ~T0-45.2 s and has a total duration of ~91.0 s.\nThe emission is seen up to ~4 MeV.\n\nThe Konus-Wind light curve of this GRB is available at\nhttp://www.ioffe.ru/LEA/GRBs/GRB240627_T86332/\n\nAs observed by Konus-Wind, the burst\nhad a fluence of 5.22(-0.54,+0.57)x10^-5 erg/cm2,\nand a 64-ms peak flux, measured from T0+6.016 s,\nof 1.27(-0.23,+0.23)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+47.616 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 = -1.31(-0.07,+0.09),\nthe high energy photon index beta = -2.47(-0.39,+0.20),\nthe peak energy Ep = 191(-23,+25) keV\n(chi2 = 110/87 dof).\n\nThe spectrum near the maximum count rate\n(measured from T0+5.376 to T0+7.168 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 = -1.06(-0.10,+0.11),\nthe high energy photon index beta = -2.49(-0.63,+0.26),\nthe peak energy Ep = 314(-54,+61) keV\n(chi2 = 49/55 dof).\n\nAll the quoted errors are at the 90% confidence level.\nAll the quoted values are preliminary.\n"
}