2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/14320The results of our observational campaigns on the two extragalactic sources Mkn 501 and Mkn 421, carried out with the Imaging Element of the TACTIC array, during March-May, 1998 and April-May, 1999, are presented. The results indicate that the two BL Lac objects (Mkn 501 and Mkn 421) were in a `low' gamma-ray emission state during both epochs of our observations.3 pages, 1 Figure, to be presented in the 26th ICRC1999: OG 2.4.20Astrophysicstext