TeV gamma-ray astronomy

The observational status of gamma-ray astronomy in the TeV energy range is rapidly changing and is reviewed (1987) with emphasis on the limitations of the present observations. It is apparent that gammay-ray detection techniques must be improved and some methods by which this can be achieved are outlined. There are now more than a dozen TeV gamma-ray telescopes in operation or planned; three of these are in the USA. Ultimately the flux sensitivity that must be achieved in this field will require a telescope so large that it must be part of a national or international facility. (orig.)