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We discuss our VLA and VLBI observations of supernova 1986J, which ischaracterized by a compact radio-bright component within the expanding shell ofejecta. No other supernova (SN) has such a central component at cm wavelengths.The central component therefore provides a unique probe of the propagation ofradio signals at cm wavelengths through the ejecta of a young SN. Such a probeis important in the context of Fast Radio Bursts (FRB), which, in many models,are thought to be produced by young magnetars or neutron stars. The FRB signalswould therefore have to propagate through the expanding SN ejecta. Ourobservations of the Type II SN 1986J show that the ejecta would remain opaqueto cm-wave emission like FRBs for at least several decades after the explosion,and by the time the ejecta have become transparent, the contribution of theejecta to the dispersion measure is likely small.

Recent VLBI Results on SN 1986J and the Possibility of FRBs Originating from Inside the Expanding Ejecta of Supernovae