Electronic Telegram No. 243 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://cfa-www.harvard.edu/iau/cbat.html SUPERNOVAE 2005em, 2005er, 2005es, 2005et N. Morrell, G. Folatelli, and M. M. Phillips, on behalf of the Carnegie Supernova Project, report spectroscopic observations (range 380-920 nm) of SN 2005er (cf. IAUC 8608), SN 2005es (cf. IAUC 8608), SN 2005et (cf. IAUC 8610), and SN 2005em (cf. IAUC 8604) obtained on Oct. 5.13, 5.18, 5.27, and 5.35 UT, respectively, with the Las Camapanas 2.5-m du Pont telescope (+ WFCCD spectrograph). SN 2005er is a peculiar type-Ia supernova, similar to SN 1991bg, probably a few days after maximum light. Strong Ti II absoprtions are observed. Assuming the NED recession velocity of 7847 km/s for the host galaxy (from Wegner et al. 1999, MNRAS 305, 259), an expansion velocity of 9600 km/s is derived from the absorption minimum of the Si II 635.5-nm doublet. SN 2005es is a young type-II supernova showing a rather featureless, blue continuum in the somewhat noisy spectrogram. H_alpha and H_beta are seen with P-Cyg profiles. Assuming the NED recession velocity of 11287 km/s for the host galaxy (from Huchra et al. 1999, Ap.J. Suppl. 121, 287), an expansion velocity of 9600 km/s is derived from the absorption minimum of H_beta. SN 2005et is a type-Ia supernova about one week after maximum light. The spectrogram is similar to that of SN 1989B at eight days after maximum; an expansion velocity of 10000 km/s is derived from the minimum of the Si II 635.5-nm line, after adopting the NED recession velocity of 10371 km/s for the host galaxy (from Wegner et al., op.cit.). SN 2005em is probably a type-IIb supernova a few days after maximum light, the spectrogram showing some resemblance to those of SN 1987K. NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2005 CBAT 2005 October 6 (CBET 243) Daniel W. E. Green