A.M.Amelushkin, V.O.Barinova, M.I.Panasyuk, A.V.Bogomolov, A.F.Iyudin,
V.V.Kalegaev, D.Nguen, V.L. Petrov, I.V.Yashin, P.S.Kazarian,
Physics Department, Skobel`tsyn Institute of Nuclear Physics, Lomonosov
Moscow State University
V. Lipunov, E.S. Gorbovskoy, N.Tyurina, D.Kuvshinov, M.Panchenko
Lomonosov Moscow State University, Sternberg Astronomical Institute
I. Park, J. Lee, S. Jeong
Department of Physics, Sungkyunkwan University, Seobu-ro, Jangangu,
At event time for G268556 the detectors BDRG-1 and BDRG-2 on-board
Lomonosov were directed >60 degrees far from all regions present on LIGO
probability map for G268556. BDRG-3 detector observed the southern high
probability region directed to RA=25.8, Dec=-30.7. The Lomonosov satellite
was located over South Africa at outer regions of SAA leading to high
background. No burst-like events were observed, the 3 sigma upper limit
for 1s-long GRB flux in 20-800 keV range is 2.5 cm-2*s-1.
The time intervals when the region of maximal probability of GW source was
in BDRG FOV on 04.01.2017 from 9h to 13h are 9:07-9:27, 9:33-9:47,
10:42-11:02, 11:07-11:24, 12:17-12:37, 12:42-12:59. No on-board
GRB-triggers were generated at this time intervals.
BDRG on-board triggers were generated 4 times during the time period from
10 hours before GW event to 10 hours after it (at 02:33:17, 0 4:12:19,
08:06:49 and 13:36:41).The significance of all these triggers do not
exceed 9.5 sigma correspondent to the level of random events occurring ~10
times per day. The upper limit for 1s-GRB flux in 50-300 keV is 0.5
cm-2*s-1 equivalent to 1e-7 erg/cm2 for typical GRB spectra.
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