Search for very high energy gamma ray emission from Cygnus X-3

The Haleakala Gamma Ray Telescope is designed to detect very high energy gamma rays by the atmospheric Cherenkov technique, with an energy threshold of approximately 300 GeV. During 1985, approximately 113 hours of observations were conducted on Cygnus X-3. These data were analyzed to search for pulsar-like periodicity and periodicity correlated with the 4.8 hour period seen in x-ray and infrared data. While no periodic structure was detected at any of the aforementioned time scales, long-term averaging indicates gamma ray emission from Cygnus X-3 is present, and is 2-3% of the ambient cosmic ray background