{
  "bibcode": "2009GCN..9171....1G",
  "body": "S. Golenetskii, R.Aptekar, E. Mazets, V. Pal'shin, D. Frederiks, P.\nOleynik, M. Ulanov, D. Svinkin, and T. Cline on behalf of the Konus-Wind\nteam report:\n\nThe long Swift-BATSS GRB 090418B (Copete et al., GCN 9159)\ntriggered Konus-Wind at T0=32366.325 s UT (08:59:26.325).\n\nThe burst light curve shows a soft weak precursor at ~T0-20 s, the main \nmultipeaked pulse at T0 with a duration of ~45 s, and a weak soft pulse \nat ~T0+70 with a duration of ~30 s (the same lc structure was seen by \nBAT: Copete et al., GCN 9159).\n\nAs observed by Konus-Wind the burst\nhad a fluence of (2.31 +/- 0.09)x10^-5 erg/cm2,\nand a 256-ms peak flux measured from T0+15.840 s\nof (1.54 +/- 0.20)x10^-6 erg/cm2/s\n(both in the 20 keV - 1 MeV energy range).\n\nThe time-integrated spectrum of the burst\n(from T0 to T0+40.704 s) can be fitted (in the 20 keV-1 MeV range)\nby a power law with exponential cutoff model:\ndN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep)\nwith alpha = -1.23(-0.09, +0.010),\nand Ep = 117(-7, +8) keV (chi2 = 62.0/56 dof).\nFitting by GRB (Band) model yields the same alpha and Ep,\nand only an upper limit on the high energy\nphoton index: beta < -3.18 (chi2 = 62.0/55 dof).\n\nAll the quoted errors are at the 90% confidence level.\n\nThe Konus-Wind light curve of this GRB is available\nat http://www.ioffe.ru/LEA/GRBs/GRB090418_T32366/",
  "circularId": 9171,
  "createdOn": 1240234241000,
  "email": "val@mail.ioffe.ru",
  "subject": "Konus-Wind observation of GRB 090418B",
  "submitter": "Valentin Pal'shin at Ioffe Inst  <val@mail.ioffe.ru>",
  "eventId": "GRB 090418B"
}