Special Notice #283: Supernova 2012cg IN NGC 4424 = PSN J12271283+0925132
May 23, 2012: IAU Central Bureau Electronic Telegram 3111 (Daniel W. E. Green, ed.) announces the LOSS discovery (reported by M. Kandrashoff, S. B. Cenko, W. Li, and A. V. Filippenko) of a supernova in NGC 4424 on 2012 May 17.22 at unfiltered magnitude 16.9.
Spectra indicating the object to be a Type Ia supernova discovered about two weeks before maximum were obtained by: