{
  "bibcode": "2018GCN.22918....1F",
  "body": "D. Frederiks, S. Golenetskii, R.Aptekar, A. Kozlova,\nA.Lysenko,  D. Svinkin, A. Tsvetkova,  M. Ulanov, and T. Cline,\non behalf of the Konus-Wind team, report:\n\nThe long GRB 180704A (Swift/BAT detection: Sonbas et al.,\nGCN 22885; Markwardt et al., GCN 22894;\nAstroSat CZTI detection: Sharma et al., GCN 22901)\ntriggered Konus-Wind at T0=20182.254 s UT (05:36:22.254).\n\nThe KW light curve shows a multi-peaked structure with\na total duration of ~40 s. A possible precursor is\nseen in the waiting mode data around T0 - 62 s.\nThe emission is seen up to ~4 MeV.\n\nAs observed by Konus-Wind, the burst had a fluence of\n(1.8 �� 0.1)x10^-5 erg/cm2 and a 64-ms peak energy flux,\nmeasured from T0+20.352, of (2.4 �� 0.2)x10^-6 erg/cm2\n(both in the 20 keV - 10 MeV energy range).\n\nThe time-integrated spectrum (measured from T0 to T0+24.832 s)\nis best fit in the 20 keV - 15 MeV range by a cutoff power-law\n(CPL) function with the following model parameters:\nthe photon index alpha = -0.49(-0.13,+0.14),\nand the peak energy Ep = 183(-11,+33) keV,\nchi2 = 98/98 dof.\nFitting this spectrum with the GRB (Band) function yields\nthe same alpha and Ep, and only an upper limit on beta (<-3.2).\n\nThe spectrum near the peak count rate (measured from T0+16.640\nto T0+24.832 s) is best fit in the 20 keV - 15 MeV range by\nthe CPL function with the following model parameters:\nthe photon index alpha = -0.38(-0.20,+0.22),\nand the peak energy Ep = 163(-13,+15) keV,\nchi2 = 121/98 dof.\nFitting this spectrum with the GRB (Band) function yields\nthe same alpha and Ep, and only an upper limit on beta (<-3.2).\n\nThe Konus-Wind light curve of this GRB is available at\nhttp://www.ioffe.ru/LEA/GRBs/GRB180704_T20182/\n\nAll the quoted errors are estimated at the 90% confidence level.\nAll the presented results are preliminary.",
  "circularId": 22918,
  "createdOn": 1530893175000,
  "email": "fred@mail.ioffe.ru",
  "subject": "Konus-Wind observation of GRB 180704A",
  "submitter": "Dmitry Frederiks at Ioffe Institute  <fred@mail.ioffe.ru>",
  "eventId": "GRB 180704A"
}