Abstract

The University of Durham Mark 6 very high energy (VHE) γ-ray telescope has been used to observe the X-ray selected BL lac PKS 2155-304 in 1996, 1997 and 1998. The data show evidence for the emission of VHE γ-rays with E>300 GeV in 1996 September and 1997 October/November. There is evidence to support a correlation between the X-ray emission and VHE γ-ray emission. The strongest VHE emission was observed in 1997 November, when the object was producing the strongest high-energy X-ray emission ever recorded, and emission was also detected at E>100 MeV.

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