2012CBET.3233....2M

N. Morrell, Las Campanas Observatory, on behalf of the Carnegie Supernova Project, reports on an optical spectrogram (range 370-920 nm) obtained of PSN J02452841-6207214 = SN 2012ew on Sept. 14.25 UT with the 2.5-m du Pont telescope at Las Campanas Observatory. Inspection of the data reveals that this is an evolved type-II supernova. Comparison with a library of supernova spectra via the Supernova Identification tool (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) yields good comparisons with a number of type II-p supernovae with no clear indication of age, though the best comparison is to that of SN 2004et at 83 days past maximum brightness, which is consistent with both the early detection by the BOSS team on July 17 and their last non-detection on Apr. 24. H-alpha and [O III] nebular emission from an underlying H II region at the redshift quoted by NED for the host galaxy (2MASX J02452974-6207300; z = 0.025700, Colless et al. 2003, The 2dF Galaxy Redshift Survey Final Data Release) is also present on the supernova spectrum. Adopting this redshift, the minimum of the H-beta absorption appears to be blueshifted by 2700 km/s.