Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-06-08
Astronomy and Astrophysics
Astrophysics
4 pages, 3 figures, to appear in the Proceedings of 26th International Cosmic Ray Conference (Salt Lake City, 1999)
Scientific paper
The X-ray selected BL Lac PKS 2155-304 has been observed using the University of Durham Mark 6 very high energy gamma ray telescope during 1998. We find no evidence for TeV emission during these recent observations when the X-ray flux was observed to be low. We have reconsidered our measurements made in 1997 November when PKS 2155-304 was in a bright X-ray state and extended X-ray and GeV gamma ray observations were made as part of a multiwavelength campaign. Comparisons are made of the VHE emission during this time with the available data from other wavelengths.
Chadwick Paula M.
Lyons Kelly
McComb T. J. L.
Orford K. J.
Osborne John L.
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