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We report the detection of broad, high-velocity oxygen emission lines fromthe site of SN 1941C nearly eight decades after outburst, making it the oldestoptically detected core-collapse supernova/youngest core-collapse supernovaremnant with a well determined age. In contrast to the strongly blueshiftedemission line profiles observed for all other late-time CCSNe thought to be dueto dust extinction of rear hemisphere ejecta, SN 1941C's spectrum exhibitsstronger redshifted than blueshifted emissions of [O I] 6300, 6364 A, [O II]7319, 7330 A, and [O III] 4959, 5007 A. The oxygen emissions exhibit rest frameexpansion velocities of -2200 to +4400 km/s. No other significant broad lineemissions were detected including Halpha emission. We discuss possible causesfor this unusual spectrum and compare SN 1941C's optical and X-ray luminositiesto other evolved CCSNe.

Detection of Late-Time Optical Emission from SN 1941C in NGC 4136