Electronic Telegram No. 1393 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 2008cm, 2008cn, AND 2008cp M. Stritzinger and N. Morrell, on behalf of the Carnegie Supernova Project, report spectroscopic observations (range 348-968 nm) of 2008cm (cf. CBET 1384), 2008cn (cf. CBET 1385), and 2008cp (cf. CBET 1387) obtained on May 29.94, 30.11, and May 29.99, respectively, with the Boller and Chivens spectrograph attached to the du Pont 2.5-m telescope at Las Campanas Observatory. The spectrum of 2008cm appears to be that of a type-Ia supernova around a week before maximum light. Using the "Supernova Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024), they find 2008cm most similar to supernova 2003du at six days before maximum. Adopting a recession velocity of 3240 km/s (Wong et al. 2006, MNRAS 371, 4) for the host galaxy, NGC 2369, the Si II 635.5-nm absorption is measured to be blueshifted by 12100 km/s. SN 2008cn is a type-II supernova a few days past explosion. Comparison with a library of supernova spectra via de 'superfit' tool (Howell et al. 2005, Ap.J. 634, 1190) gives a very good match with SN 1993W and SN 1999em at four days past explosion. Adopting for the host galaxy, NGC 4603, the NED recession velocity of 2592 km/s (Wong et al. 2006, MNRAS 371, 4) they measure for the minimum of the H-beta absorption an expansion velocity of 11600 km/s. The spectrum of SN 2008cp is that of a type-Ia supernova around 8 to 10 days past maximum light. From H-alpha and [N II] 658.3-nm emissions present in the supernova spectrum, they derive a heliocentric redshift of 24950 km/s. Adopting this redshift, the minimum of the Si II 635.5-nm absorption is blueshifted by 9900 km/s, and 'superfit' provides very good matches to supernovae 2005am and 1998bu at 8-9 days after maximum. NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2008 CBAT 2008 June 3 (CBET 1393) Daniel W. E. Green