{
  "subject": "Konus-Wind detection of GRB 250627A",
  "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 short-duration GRB 250627A\n(SVOM-GRM detection: Wang et al., GCN 40871;\nInsight-HXMT detection: Wang et al., GCN 40872;\nIPN triangulation: Kozyrev et al., GCN 40888)\ntriggered Konus-Wind at T0=60377.861 s UT (16:46:17.861).\n\nThe burst light curve shows a multipeaked structure\nwhich starts at ~T0-0.3 s and has a total duration of ~1.1 s.\nThe emission is seen up to ~10 MeV.\n\nThe Konus-Wind light curve of this GRB is available at\nhttp://www.ioffe.ru/LEA/GRBs/GRB250627_T60377/\n\nAs observed by Konus-Wind, the burst\nhad a fluence of 9.65(-1.16,+1.29)x10^-6 erg/cm2,\nand a 16-ms peak flux, measured from T0+0.420 s,\nof 2.60(-0.49,+0.52)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+8.448 s)\nis best fit in the 20 keV - 10 MeV range\nby a power law with exponential cutoff model:\ndN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep)\nwith  alpha = -0.31(-0.21,+0.25)\nand Ep = 874(-128,+160) keV (chi2 = 73/76 dof).\nFitting by a GRB (Band) model yields the same alpha and Ep,\nand an upper limit on the high energy photon index: beta < -2.7\n(chi2 = 73/75 dof).\n\nAll the quoted errors are at the 68% confidence level.\nAll the quoted values are preliminary.\n",
  "format": "text/plain",
  "submitter": "Anna Ridnaia at Ioffe Institute <ridnaia@mail.ioffe.ru>",
  "circularId": 40889,
  "eventId": "GRB 250627A",
  "createdOn": 1751473040050,
  "submittedHow": "web",
  "bibcode": "2025GCN.40889....1R"
}