2010CBET.2489....1M

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.