{
  "format": "text/plain",
  "createdOn": 1778841903967,
  "circularId": 44617,
  "subject": "Konus-Wind detection of GRB 260512A",
  "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 260512A\n(Fermi-GBM detection: The Fermi GBM team, GCN 44587;\nNuSTAR-ACS detection: Waratkar et al., GCN 44591;\nAstroSat-CZTI detection: Tembhurnikar et al., GCN 44608;\nIPN triangulation: Kozyrev et al., GCN 44611)\ntriggered Konus-Wind at T0=61005.883 s UT (16:56:45.883).\n\nThe burst light curve shows a multipeaked structure\nwhich starts at ~T0-0.7 s and has a total duration of ~23 s.\nThe emission is seen up to ~2 MeV.\n\nThe Konus-Wind light curve of this GRB is available at\nhttp://www.ioffe.ru/LEA/GRBs/GRB260512_T61005/\n\nAs observed by Konus-Wind, the burst\nhad the total fluence of 2.45(-0.24,+0.20)x10^-5 erg/cm2,\nand the 64-ms peak flux, measured from T0+4.464 s,\nof 6.32(-0.82,+0.83)x10^-6 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+24.832 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 = -0.99(-0.09,+0.09),\nthe high energy photon index beta = -2.60(-0.46,+0.17),\nthe peak energy Ep = 202(-16,+22) keV\n(chi2 = 117/98 dof).\n\nThe spectrum near the maximum count rate\n(measured from T0+0.256 to T0+8.448 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 = -0.82(-0.08,+0.08),\nthe high energy photon index beta = -2.53(-0.13,+0.10),\nthe peak energy Ep = 193(-11,+13) keV\n(chi2 = 93/79 dof).\n\nAll the quoted errors are at the 68% confidence level.\nAll the quoted values are preliminary.",
  "submittedHow": "web",
  "submitter": "Anna Ridnaia at Ioffe Institute <ridnaia@mail.ioffe.ru>",
  "eventId": "GRB 260512A"
}