Observation of the Crab Nebula Gamma-Ray Emission Above 220 Gev by the Cat Cherenkov Imaging Telescope
Barrau, A. · Bazer-Bachi, R. · Cabot, H. · Chounet, L. M. · Debiais, G. · Degrange, B. · Dezalay, J. P. · Djannati-Atai, A. · Dumora, D. · Espigat, P. · Fabre, B. · Fleury, P. · Fontaine, G. · George, R. · Ghesquiere, C. · Goret, P. · Gouiffes, C. · Grenier, I. A. · Iacoucci, L. · Bohec, S. Le · Mallet, I. · Meynadier, C. · Munz, F. · Palfrey, T. A. · Pare, E. · Pons, Y. · Punch, M. · Quebert, J. · Ragan, K. · Renault, C. · Rivoal, M. · Rob, L. · Schovanek, P. · Smith, D. · Tavernet, J. P. · Vrana, J.
Original · EN
The CAT imaging telescope, recently built on the site of the former solar plant Themis (French Pyrenees), observed gamma-rays from the Crab nebula from October 1996 to March 1997. This steady source, often considered as the standard candle of very-high-energy gamma-ray astronomy, is used as a test-beam to probe the performances of the new telescope, particularly its energy threshold (220 GeV at 20 degrees zenith angle) and the stability of its response. Due to the fine-grain camera, an accurate analysis of the longitudinal profiles of shower images is performed, yielding the source position in two dimensions for each individual shower.
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