2011CBET.2667....2M

N. Morrell, Las Campanas Observatory; M. Stritzinger, Stockholm University; and Luis Ho, Carnegie Observatories, report that they obtained a spectrum (range 340-910 nm) of 2011am on Mar. 5.4 UT with the Magellan II Clay 6.5-m telescope (+ MagE) at Las Campanas Observatory. The spectrum of 2011am is that of a young, normal type-Ib supernova, most similar to SN 2007Y (Stritzinger et al. 2009, Ap.J. 696, 713) at about a week before maximum. Adopting for NGC 4219 a recession velocity of 1989 km/s (Koribalski et al. 2004, A.J. 128, 16), the minimum of the absorption lines of Ca II H and K, He I 587.6-nm, and the Ca II infrared triplet appear to be blueshifted by roughly 15000 km/s. A similar anaylsis yields an expansion velocity of 12500 km/s for Fe II 516.9-nm. The medium-resolution spectrum also exhibits strong Ca II H and K and Na I D interstellar absorption at the radial velocity of the host galaxy. Morrell also sends position end figures 26s.6, 21".0 for 2011am.