2011CBET.2760....3P

J. L. Prieto, Carnegie Observatories, reports that a spectrogram (range 380-920 nm; resolution 0.7 nm) of 2011dy was obtained on July 3 UT with WFCCD mounted on the du Pont 2.5-m telescope at Las Campanas Observatory. The SNID cross-correlation software (Blondin and Tonry 2007, Ap.J. 666, 1024) was used to aid identification and age/redshift estimation. The spectrum of 2011dy shows a very blue continuum and broad Balmer lines with P-Cyg profiles, characteristic of young type-II supernovae. SNID gives an age of 1-2 weeks after explosion. After correcting for the recession velocity of the host galaxy, UGC 12628 (4679 km/s; Theureau et al. 1998, A.Ap. Suppl. 130, 333), a blueshift of the H-alpha P-Cyg profile of 8000 km/s is measured.