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The development of techniques whereby gamma rays of energy 100 GeV and above can be studied from the ground, using indirect, but sensitive, techniques has opened up a new area of high energy photon astronomy. The most exciting result that has come from these is the detection of highly variable fluxes of TeV gamma rays from the relativistic jets in nearby AGN. The recent detection of signals from a...
Between 7 March 2002 and 15 June 2002, an intensive multiwavelength campaign was carried out on the extreme BL Lac object H1426+428. Previous measurements have indicated that the synchrotron peak of H1426+428 lies in excess of 100 keV. At a redshift of 0.129, this active galactic nucleus (AGN) provides us with an excellent opportunity to study the properties of the extragalactic medium through which...
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