Search for local neutrino sources at BUST. M.M. Boliev for BUST Collaboration Institute for Nuclear Research of the Russian Academy of Sciences BNO 50

Baksan Underground scintillation telescope (BUST) Effective depth - 850 hg/cm2 17 m 17 m 11 m the scintillator CnH2n+2 (n ≈ 9) the total mass of scintillator is 330 t (3180 counters) three lower horizontal layers (the interior) -130 t, 1200 counters counter's threshold: inner planes – 8 MeV outer planes –10 MeV Angular resolution – 1.5° BNO 50

First upward-going muon Event: Dec 14 1918 08:31:10 Baksan neutrino experiment is in operation from Dec. 1978. Registration method: time-of-flight X – Z view Y – Z view t4=45ns t3=35ns t2=19ns t1=8ns First upward-going muon Event: Dec 14 1918 08:31:10 BNO 50

Live time (Dec 1978 ÷ May 2017): 31.05 years In 1978 ÷ 2000 years two hardware triggers are used in order to reject downward going atmospheric muons. Trigger I covers the zenith angle range 95 ÷ 180 while trigger II selects horizontal muons in the range 80 ÷ 100 . The hardware trigger efficiency of 99% has been measured with the flux of atmospheric muons. Since 2000 no use any hardware triggers. Live time (Dec 1978 ÷ May 2017): 31.05 years Upward-going muons (νμ events): 1635 — triggered + non-triggered Horizontal muons: 592 events , triggered + non-triggered BNO 50

Events distribution in equatorial coordinates (α,δ) BNO 50

Events distribution in galactic coordinates (b,l) Latitude(°) Longitude(°) BNO 50

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Для получения величины потока от предполагаемого источника необходимо знать эффективную площадь и время наблюдения в этом телесном угле. Распределение времени по склонению: Non-visible δ≥ +44° Full time visible δ≤ -46° BNO 50

Flux limits for AP objects (rc= 5°) R.A.(°) Dec.(°) Expect N Events μ Flux (cm-2 s-1) 90% C.L. Gal. C. 265.6° -28.9 6.5 5 0.32∙10-14 Crab (NGC 1952) 83.6 +22.0 1.9 0.87∙10-14 Vela X-1 135.5 -40.3 4 0.15∙10-14 SS433 288.0 +5.0 2.8 1 0.63∙10-14 3c 273 187.3 +2.0 2.9 0.52∙10-14 Cen A (NGC 5128) 201.4 -43.0 6.8 Cen X-3 170.3 -60.6 6.3 3 0.11∙10-14 Geminga (SN 437) 98.5 +17.8 2.1 2 1.35∙10-14 Cygnus X-3 307.7 +40.8 0.1 0.99∙10-14 Scorpius X-1 245.0 -15.6 4.2 0.37∙10-14 BNO 50

Search for electron neutrinos associated with gravitational wave events GW150914 and GW151226 (and LVT151012) at the BUST: (1200 + 1020) counters → 200 tons of LS → 1031 nuclei of 12C no double-signal events during ±1 day The electron neutrino fluence upper limit without oscillation and assuming a monochromatic spectrum BNO 50

Total integrated electron neutrino fluence, BUST νe: GW150914, GW151226 и LVT151012 Total integrated electron neutrino fluence, 21 МэВ ≤ E ≤ 111 МэВ, dN/dE ~ E-2 I ≤ 5.6·1011 νe/cm2 The electron neutrino luminosity upper limits (without oscillation). GW150914 L0 = 3.·1061 эрг GW151226 L0 = 3.5·1061 эрг LVT151012 L0 = 2.2·1062 эрг BNO 50

Search for muon neutrinos/antineutrinos associated with gravitational wave events GW150914: no neutrino events in ± 7 days Total integrated muon neutrino+antineutrino fluence (without oscillation) 1 GeV ≤ E ≤ 100 GэВ, dN/dE ~ E-2 I ≤ 3631 ν/cm2 BNO 50

Upper limits on neutrino energy fluence from GW150914 dN/dE ~ E-2 E1 = 1 GeV, E2 = 100 GeV Emin = 1 GeV, Emax = 105 GeV The muon neutrino+antineutrino luminosity upper limits. L0 = 6.9·1054 эрг BNO 50

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BNO 50 No local sources of muon neutrinos was found . Upper limits for some astrophysical objects. No coincidence or correlations of νμ and νe BUST data with gravitational wave events . BNO 50

min Seff BNO 50

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