Electronic Telegram No. 1125 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 SUPERNOVA 2007oo IN UGC 12558 S. Blondin, Harvard-Smithsonian Center for Astrophysics (CfA), on behalf of the CfA Supernova Group, reports that a spectrogram (range 350-740 nm) of 2007oo (cf. CBET 1122), obtained by P. Berlind on Nov. 7.33 UT with the F. L. Whipple Observatory 1.5-m telescope (+ FAST), shows it to be a highly reddened type-Ia supernova around maximum light. The supernova spectrum is contaminated by that of its host galaxy. Cross-correlation with a library of supernova spectra using the "Supernova Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) indicates that 2007oo is most similar to the type-Ia supernova 2002bo at maximum. The absorption feature at 580 nm due to Si II appears stronger than in normal type-Ia supernovae, which suggests a possible sub-luminous event, but the low signal-to-noise ratio of the spectrum prevents a definitive conclusion. Adopting a recession velocity of 8921 km/s for the host galaxy (from The Updated Zwicky Catalog, http://tdc-www.harvard.edu/uzc), the maximum absorption in the Si II line (rest 635.5 nm) is blueshifted by roughly 12000 km/s. NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2007 CBAT 2007 November 9 (CBET 1125) Daniel W. E. Green