A. Barrau et al., THE CAT IMAGING TELESCOPE FOR VERY-HIGH-ENERGY GAMMA-RAY ASTRONOMY, Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, 416(2-3), 1998, pp. 278-292
The CBT (Cherenkov Array at Themis) imaging telescope, equipped with a
very-high-definition camera (546 fast phototubes with 0.12 degrees sp
acing surrounded by 54 larger tubes in two guard rings) started operat
ion in Autumn 1996 on the site of the former solar plant Themis (Franc
e). Using the atmospheric Cherenkov technique, it detects and identifi
es very high energy gamma-rays in the range 250 GeV to a few tens of T
eV. The instrument, which has detected three sources (Crab nebula, Mar
karian 421 and Markarian 501), is described in detail. (C) 1998 Elsevi
er Science B.V. All rights reserved.