{
  "bibcode": "2009GCN..9959....1G",
  "body": "S. Golenetskii, R.Aptekar, E. Mazets, V. Pal'shin, D. Frederiks,\nP. Oleynik, M. Ulanov, and D. Svinkin on behalf of\nthe Konus-Wind and Konus-RF teams, and\nT. Cline on behalf of the Konus-Wind team, report:\n\nThe long bright GRB 090926A (Fermi-GBM trigger 275631628 / 090926181: \nBissaldi, GCN 9933) localized by Fermi-LAT (Uehara et al., GCN 9934) \ntriggered Konus-Wind at T0=15628.683 s UT (04:20:28.683).\nIt was also detected by Konus-RF instrument onboard CORONAS-PHOTON s/c \nin the waiting mode while being at high latitudes.\n\nThe burst light curve shows a multipeaked structure with a total \nduration of ~16 s, followed by a weak tail seen up to ~T0+50 s.\n\nAs observed by Konus-Wind the burst\nhad a fluence of 1.80(-0.07, +0.08)x10^-4 erg/cm2,\nand a 16-ms peak flux measured from T0+8.944 s\nof 2.91(-0.54, +0.56)x10^-5 erg/cm2/s\n(both in the 20 keV - 10 MeV energy range).\n\nThe time-integrated spectrum of the burst\n(from T0 to T0+26.880 s) can be fitted (in the 20 keV - 10 MeV\nrange) by GRB (Band) model for which:\nthe low-energy photon index alpha = -0.76 +/- 0.03,\nthe high energy photon index beta = -2.59(-0.13, +0.10),\nthe peak energy Ep = 321 +/- 12 keV (chi2 = 106.0/84 dof).\nThe emission is clearly seen up to ~10 MeV.\n\nAll the quoted errors are at the 90% confidence level.\n\nAssuming z = 2.1062 (Malesani et al., GCN 9942)\nand a standard cosmology model with H_0 = 70 km/s/Mpc, Omega_M = 0.27,\nOmega_\\Lambda = 0.73, the isotropic energy release E_iso ~2.0x10^54 erg,\nthe peak luminosity (L_iso)_max ~ 1.0x10^54 erg/s, and Ep_rest ~1000 keV.\n\nThe Konus-Wind light curve of this GRB is available\nat http://www.ioffe.ru/LEA/GRBs/GRB090926_T15628/",
  "circularId": 9959,
  "createdOn": 1254156148000,
  "email": "val@mail.ioffe.ru",
  "subject": "Konus-Wind and Konus-RF observations of GRB 090926A",
  "submitter": "Valentin Pal'shin at Ioffe Inst  <val@mail.ioffe.ru>",
  "eventId": "GRB 090926A"
}