AGN STATISTICS OF SIMULTANEOUS RADIO AND GAMMA-RAY OBSERVATIONS

We investigate the behaviour of hat-spectrum radio quasars (FSRQ) in m ultifrequency radio observations with the 100-m-Effelsberg telescope t aken quasi-simultaneously with high energy gamma-ray observations duri ng phases 1 and 2 of the EGRET campaign. We find that FSRQ which are d etected by EGRET show at the time of the gamma-ray detection a more ac tive behaviour in the radio band compared to FSRQ which are not detect ed by EGRET at any time. No correlation is found between the 2.8 cm fl ux density and the simultaneously observed gamma-ray flux (> 100 MeV), or between the 2.8 cm-to-6 cm radio spectral index and the integrated gamma-ray flux. Our data support an earlier finding that AGN are pref erentially detected in high energy gamma-rays when they are in an incr easing radio state.