Analysis of CANGAROO data shows no evidence for long-term or short-term emission of gamma-rays above 2 TeV from the BL Lacs PKS0521-365, EXO 0423.4-0840, PKS2005-489, PKS2316-423. The upper limits to steady emission are (PKS0521-365), (EXO 0423.4-0840), (PKS2005-489), and (PKS2316-423). For the XBL PKS2005-489 the flux limits presented in this paper do not constrain the TeV emission levels predicted by the simple model of Stecker et al. 1996.
© European Southern Observatory (ESO) 1998
Online publication: August 6, 1998