Very high energy gamma-quanta 1-65 TeV from the Cygnus X-3 binary

The results of almost ten-year observation of Cygnus X-3 point source by SHALON mirror Cherenkov telescope are presented. The galactic source Cygnus X-3, known for more than 10 years as a source with variable intensity <10−11−5
- 10−12cm−2s−1, was regularly observed since 1995 with average gamma-quantum flux F(EO>0.8TeV)=(6.8±0.7)
- 10−13cm−2s−1. The flux in 2003 was (1.79±0.33)
- 10−12cm−2s−1. Earlier, in 1997, an increase in the flux was also observed (1.2±0.5)
- 10−12cm−2s−1. The limits on gamma-rays from Cygnus X-3, the source that results stimulated the construction of many new detectors are presented. These upper limits and SHALON fluxes are now more than a factor 100 less than the fluxes originally reported.