Electronic Telegram No. 1358 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 2008bv, 2008bw, 2008ca, AND 2008cb J. M. Silverman, T. N. Steele, A. V. Filippenko, R. J. Foley, and D. Poznanski, University of California, Berkeley, report that inspection of CCD spectra (range 320-920 nm), obtained on Apr. 28 UT with the Keck I 10-m telescope (+ LRIS), shows that SN 2008bv (CBET 1345) is a type-Ia supernova near maximum brightness, significantly reddened. Removing the host-galaxy recession velocity of 16400 km/s (from narrow emission lines), the minimum of the Si II 635.5-nm absorption feature is found to be blueshifted by about 13400 km/s. SN 2008bw (CBET 1346) is also a type-Ia supernova, probably 2-3 weeks past maximum brightness. Removing the host-galaxy recession velocity of 9931 km/s (Falco et al. 1999, PASP 111, 438), the minimum of the Si II 635.5-nm absorption feature is found to be blueshifted by about 11200 km/s. SN 2008ca (CBET 1355) is a type-Ia supernova at redshift 0.1315 (from narrow lines). Using a principal-component analysis (Foley et al. 2007, ArXiV:0710.2338), a significant amount of galaxy contamination is removed; the SNID routine (Blondin and Tonry, 2007, Ap.J. 666, 1024) then shows the remaining spectrum to be similar to that of type-Ia supernovae about one month past maximum light. Likewise, SN 2008cb (CBET 1355) is a type-Ia supernova about 1 month past maximum. Using the "superfit" fitting routine (Howell et al. 2005, Ap.J. 634, 1190), the spectrum resembles that of SN 1994D at 20 days past maximum brightness with a significant amount of galaxy contamination. NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2008 CBAT 2008 April 29 (CBET 1358) Daniel W. E. Green