From several southern hemisphere radio-wavelength monitoring programs, we have compiled multi-wavelength observations of a number of both EGRET-detected sources and sources with similar radio-properties that have not been detected by EGRET. The radio observations were made at 0.8, 2, 5, 8, 90 and 230 GHz, though not all sources were monitored at all wavelengths. The data are compared with EGRET data to the end of Cycle 4 (October 1995) in an effort to confirm previously reported correlations between activity at radio wavelengths and EGRET detections, and to investigate whether the non-EGRET-detected sources were in radio- and gamma-ray–quiet phases during this period.
