{
  "submittedHow": "web",
  "createdOn": 1781004417319,
  "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 260607B\n(Fermi-GBM detection: Fermi-GBM team, GCN 44859;\nNeights & Palafox, GCN 44861;\nFermi-LAT detection: Holzmann Airasca et al., GCN 44860;\nAstroSat CZTI detection: Harsha et al., GCN 44871;\nGECAM-B detection: Wang et al., GCN 44880)\ntriggered Konus-Wind at T0=47968.353 s UT (13:19:28.353).\n\nThe burst light curve shows a bright multipeaked structure\nwhich starts at ~T0-6.8 s and ends at ~T0+50 s, \nwhich is followed by a weaker decaying  emission with a \n'bump' around ~T0+190 s. The total duration of the \nburst is ~209.8 s. The 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/GRB260607_T47968/\n\nAs observed by Konus-Wind, the burst\nhad the total fluence of 4.55(-0.09,+0.09)x10^-4 erg/cm2,\nand the 64-ms peak flux, measured from T0+29.456 s,\nof 3.33(-0.27,+0.27)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+57.600 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 = -0.88(-0.02,+0.02),\nthe high energy photon index beta = -2.87(-0.14,+0.11),\nthe peak energy Ep = 622(-15,+16) keV\n(chi2 = 103/97 dof).\n\nThe spectrum near the maximum count rate\n(measured from T0+29.184 to T0+30.720 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 = -0.74(-0.06,+0.06),\nthe high energy photon index beta = -2.80(-0.37,+0.22),\nthe peak energy Ep = 686(-51,+55) keV\n(chi2 = 48/62 dof).\n\nAll the quoted errors are at the 68% confidence level.\nAll the quoted values are preliminary.",
  "eventId": "GRB 260607B",
  "format": "text/plain",
  "circularId": 44881,
  "subject": "Konus-Wind detection of GRB 260607B"
}