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13th International Symposium on Very High-Energy Cosmic Ray Interactions, Pylos : Greece
Very high energy gamma-quanta 1–65 TeV from the Cygnus X-3 binary
V.G. Sinitsyna, T.P. Arsov, A.Y. Alaverdian, S.S. Borisov, F.I. Musin, R.M. Mirzafatikov, S.I. Nikolsky, V.Y. Sinitsyna, G.F. Platonov, J.-N. Capdevielle1, 2

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.
1:  PCC - Physique Corpusculaire et Cosmologie - Collège de France
2:  APC - UMR 7164 - AstroParticule et Cosmologie
Physics/Astrophysics/Cosmology and Extra-Galactic Astrophysics