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VOLUME 46 (1987) | ISSUE 6 | PAGE 249
Detection of extremely high-energy cosmic rays from the Cygnus X-1 and Cygnus X-3 binary systems
Data obtained at Moscow State University's extensive-air-shower installation on the detection of cosmic rays with an energy —1015 eV from point sources by the extensive-air-shower method are reported. An excess of "old" showers was observed from Cygnus X-1 in 1985 and 1986. This excess amounts to 3.8 standard deviations.