THE RADIO COUNTERPART TO THE LUMINOUS X-RAY SUPERNOVA REMNANT IN NGC-6946

We report detection from VLA observations of the radio counterpart to the very luminous X-ray and optical supernova remnant in the galaxy NG C 6946 (Schlegel 1994; Blair and Fesen 1994). We find it to be a very luminous radio source, being similar to 3 times more powerful than Cas A and within an order of magnitude of the extraordinarily powerful su pernova remnant in NGC 4449. We suggest that the NGC 6946 supernova re mnant is analogous to the NGC 4449 supernova remnant, but is probably much older. The high luminosity at radio wavelengths for the NGC 6946 supernova remnant likely results from interaction with a dense local e nvironment.