2006CBET..716....1M

N. Morrell and G. Folatelli, on behalf of the Carnegie Supernova Project, report that a spectrogram (range 401-1020 nm) of 2006lu (cf. IAUC 8770), obtained on Nov. 3.31 UT with the EMMI spectrograph attached to the New Technology Telescope at La Silla, reveals that it is a type-Ia supernova, a few days after maximum light. A narrow emission line was identified as H-alpha produced by the host galaxy. From the position of that line, a redshift of z = 0.053 was derived for the host. Adopting that redshift value, the spectral-feature dating code by Riess et al. (1997, A.J. 114, 722) yields an age of 5.5 days after maximum light. Using the 'superfit' supernova-spectrum-comparison code (Howell et al. 2005, Ap.J. 634, 1190), the best match is a spectrum of SN 1990N, seven days after maximum. An expansion velocity of 10500 km/s was derived from the absorption minimum of the Si II 635.5-nm feature.