Electronic Telegram No. 1246 Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A. IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions) CBAT@CFA.HARVARD.EDU (science) URL http://www.cfa.harvard.edu/iau/cbat.html SUPERNOVAE 2008Y AND 2008Z S. Blondin, Harvard-Smithsonian Center for Astrophysics (CfA), on behalf of the CfA Supernova Group, reports that spectra (range 350-740 nm) of 2008Y (cf. CBET 1240) and 2008Z (cf. CBET 1243), obtained respectively on Feb. 9.41 and 9.31 UT by M. Calkins with the F. L. Whipple Observatory 1.5-m telescope (+ FAST), show them both to be type-Ia supernovae. Cross-correlation with a library of supernova spectra using the "Supernova Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) indicates that 2008Y is most similar to the type-Ia supernova 2005cf (cf. IAUC 8534) at 5 days past maximum light, and that 2008Z is most similar to the type-Ia supernova 2003du (cf. IAUCs 8121, 8122) at 6 days before maximum. Adopting a recession velocity of 20892 km/s for the host galaxy of 2008Y (Sloan Digital Sky Survey Data Release 3), the maximum absorption in the Si II line (rest 635.5 nm) is blueshifted by roughly 11600 km/s; narrow H_alpha emission is detected in the spectrum at the redshift of the apparent host galaxy (SDSS J094315.36+361709.2; cz = 6293 km/s; SDSS Data Release 4). Adopting this recession velocity for the host galaxy of 2008Z, the maximum absorption in the Si II line is blueshifted by roughly 12700 km/s. Further to CBET 1240, T. Puckett adds that SN 2008Y appears to be associated with the spiral galaxy MCG +09-19-39 (= PGC 34650). NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2008 CBAT 2008 February 9 (CBET 1246) Daniel W. E. Green