Electronic Telegram No. 2489 Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION CBAT Director: Daniel W. E. Green; Hoffman Lab 209; Harvard University; 20 Oxford St.; Cambridge, MA 02138; U.S.A. e-mail: cbatiau@eps.harvard.edu (alternate cbat@iau.org) URL http://www.cbat.eps.harvard.edu/index.html Prepared using the Tamkin Foundation Computer Network SUPERNOVAE 2010ig AND 2010io D. Milisavljevic and R. Fesen, Dartmouth College, report on low-dispersion spectra (range 440-770 nm) taken on Oct. 10 UT with the 2.4-m Hiltner telescope (+ Mark III) at MDM Observatory. The object near UGC 4543 discovered by Duszanowicz (cf. CBET 2481), here designated 2010io, is likely a type-Ic supernova; comparison with a library of supernova spectra using the "Supernova Identification" tool (SNID; Blondin and Tonry 2007, ApJ., 666, 1024) provides reasonable matches with type-Ic events around three months post- maximum light. A spectrum of SN 2010ig (cf. CBET 2470) resembles that of the type-Ib supernova 1999ex around maximum light. NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2010 CBAT 2010 October 11 (CBET 2489) Daniel W. E. Green