{
  "bibcode": "2017GCN.20402....1B",
  "body": "V.V.Bogomolov, S.I.Svertilov,\nA.M.Amelushkin, V.O.Barinova, M.I.Panasyuk, A.V.Bogomolov, A.F.Iyudin,\nV.V.Kalegaev, D.Nguen,  V.L. Petrov, I.V.Yashin, P.S.Kazarian, \nN.L.Dzhioeva,\nPhysics Department, Skobel`tsyn Institute of Nuclear Physics, Lomonosov\nMoscow State University\n\nV. Lipunov, E.S. Gorbovskoy, N.Tyurina, D.Kuvshinov, M.Panchenko\nLomonosov Moscow State University, Sternberg Astronomical Institute\n\nI. Park, J. Lee, S. Jeong\nDepartment of Physics, Sungkyunkwan University, Seobu-ro, Jangangu, \nSuwonsi,\nKorea\n\nAt event time for G268556 the detectors BDRG-1 and BDRG-2 on-board \nLomonosov were directed  >60 degrees far from all regions present on LIGO \nprobability map for G268556. BDRG-3 detector observed the southern high \nprobability region directed to RA=25.8, Dec=-30.7. The Lomonosov satellite \nwas located over South Africa at outer regions of SAA leading to high \nbackground. No burst-like events were observed, the 3 sigma upper limit \nfor 1s-long GRB flux in 20-800 keV range is 2.5 cm-2*s-1.\nThe time intervals when the region of maximal probability of GW source was \nin BDRG FOV on 04.01.2017 from 9h to 13h are   9:07-9:27, 9:33-9:47, \n10:42-11:02, 11:07-11:24, 12:17-12:37, 12:42-12:59. No on-board \nGRB-triggers were generated at this time intervals.\nBDRG on-board triggers were generated 4 times during the time period from \n10 hours before GW event to 10 hours after it  (at 02:33:17, 0 4:12:19, \n08:06:49 and 13:36:41).The significance of all these triggers do not \nexceed 9.5 sigma correspondent to the level of random events occurring ~10 \ntimes per day. The  upper limit for 1s-GRB flux in 50-300 keV is 0.5 \ncm-2*s-1 equivalent to 1e-7 erg/cm2 for typical GRB spectra.\n\n  This message can be cited.",
  "circularId": 20402,
  "createdOn": 1483948634000,
  "email": "lipunov2007@gmail.com",
  "subject": "LIGO/Virgo G268556/GW170104: Lomonosov BDRG observations",
  "submitter": "Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov2007@gmail.com>",
  "eventId": "LIGO/Virgo G268556"
}