2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/11260The CAT imaging telescope on the site on the former solar plant Themis has been observing gamma-rays from Mrk501 above 220 GeV in March and April 1997. This source is shown to be highly variable and the light curve is presented. The detected gamma-ray rate for the most intense flare is in excess of 10 per minute.5 pages, 4 figures, Tex, contribution to 25th ICRC DurbanAstrophysicstext