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Supernova SN1993J in M81 is now over a year old. Multi-frequency radio observations began at the VLA just three days after its optical discovery and are continuing. The current radio light curves have turned optically thin at frequencies as low as 5 GHz. Although the gross behavior of this radio supernova is similar to other Type II objects, in detail SN1993J cannot be fit by the standard models. Variations on the standard model will be presented.
Sixteen other supernovae are being observed periodically. Some known radio supernovae, like SN1979C, SN1986J, and SN1988Z are being monitored to determine their late period light curves. SN1987K, 89R, 91ac, 91av, 92bd, 93G, and 93N have not yet been detected, but may turn on in the future.
