2011CBET.2728....2M

G. H. Marion, Harvard-Smithsonian Center for Astrophysics (CfA), on behalf of the CfA Supernova Group, report that a spectrum (range 340-740 nm) of PSN J15435325+6745425 = SN 2011de was obtained on May 26 UT by A. Vaz with the F. L. Whipple Observatory 1.5-m telescope (+ FAST). Cross-correlation with a library of supernova spectra using the "Supernova Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) shows that the object is a type-Ia supernova a few days before maximum light. The Si II 635.5-nm feature exhibits a double bottom that can be fitted with two gaussians at 15100 and 11000 km/s. The velocity measurement uses an estimated redshift of z = 0.031, measured from host-galaxy emission lines.