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We started two observing programs with the Korean VLBI Network (KVN)monitoring changes in the flux density and polarization of relativistic jets ingamma-ray bright AGNs simultaneously at 22, 43, 86, 129 GHz. One is asingle-dish weekly-observing program in dual polarization with KVN 21-mdiameter radio telescopes beginning in 2011 May. The other is a VLBImonthly-observing program with the three-element VLBI network at an angularresolution range of 1.0--9.2 mas beginning in 2012 December. The monitoringobservations aim to study correlation of variability in gamma-ray with that inradio flux density and polarization of relativistic jets when they flare up.These observations enable us to study the origin of the gamma-ray flares ofAGNs.

Monitoring of multi-frequency polarization of gamma-ray bright AGNs