Electronic Telegram No. 79 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 2004ec AND 2004ed M. Modjaz, R. Kirshner and P. Challis, Harvard-Smithsonian Center for Astrophysics; and T. Matheson, National Optical Astronomy Observatory, report that a spectrum (range 350-740 nm) of SN 2004ec (cf. IAUC 8396), obtained by M. Calkins on Sept. 10.13 UT with the F. L. Whipple Observatory 1.5-m telescope (+ FAST), shows it to be a type-IIn supernova. The spectrum consists of a blue continuum, indicating young age, and a narrow H_alpha component of 360 km/s (FWHM) superposed on a weaker and broader component of 1800 km/s (FWHM). A spectrogram of SN 2004ed (cf. IAUC 8397), obtained by Calkins on Sept. 10.17, shows it to be a late-time type-II supernova with strong H_alpha emission, an H_beta P-Cyg profile and other elements in absorption. Adopting the NED recession velocity of 7500 km/s for the host galaxy, the expansion velocity derived from the minimum of the H_beta line is 6200 km/s. NOTE: These 'Central Bureau Electronic Telegrams' are intended to be preliminary announcements of items that later appear in the formal IAU Circulars. Citations should normally be made to IAUCs rather than to CBETs. (C) Copyright 2004 CBAT 2004 September 14 (CBET 79) Brian G. Marsden