Abstract
Energetic (E>35 MeV) ..gamma..-rays have been observed from the direction of Cygnus X-3 with the SAS-2 ..gamma..-ray telescope. The statistical significance of the excess above the galactic and diffuse radiation is approximately 4.5 sigma. In addition, the ..gamma..-ray flux is modulated at the 4/sup h/.8 period observed in the X-ray and infrared regions, and within the statistical error is in phase with this emission. The flux above 100 MeV has an average value of (4.4 +- 1.1) x 10/sup -6/ photons cm/sup -2/ s/sup -1/. If the distance to Cygnus X-3 is 10 kpc, this flux implies a luminosity of more than 10/sup 37/ ergs s/sup -1/ if the radiation is isotropic and about 10/sup 36/ ergs s/sup -1/ if the radiation is restricted to a cone of 1 steradian, as it might be in a pulsar. Upper limits are presented for the ..gamma..-ray flux from other known or suscepted periodic X-ray sources.
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