Electronic Telegram No. 2149 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 SUPERNOVAE 2010O and 2010P S. Mattila, Tuorla Observatory; E. Kankare and J. Datson, Nordic Optical Telescope; and A. Pastorello, Queen's University, Belfast, report that they obtained low-resolution spectra of 2010O (cf. CBET 2144) and 2010P (cf. CBET 2145) on Jan. 28.0 UT with the Nordic Optical Telescope (+ ALFOSC; ranges 380-690 nm and 320-910 nm, respectively). The spectrum of 2010O shows it to be a type-Ib supernova close to maximum light. The presence of prominent narrow Na I D (588.995, 589.592 nm) absorption lines from the host galaxy indicates a significant reddening of E(B-V) about 0.6, according to the relation of Turatto et al. (2002, http://lanl.arxiv.org/abs/astro-ph/0211219). Comparison of the dereddened spectrum of 2010O with a library of supernova spectra using the "GELATO" code (Harutyunyan et al. 2008, A.Ap. 488, 383) yields a best match with the spectra of the type-Ib/c supernova 2002ji and the type-Ib supernova 2005bf around maximum light. The low-signal-to-noise spectrum of 2010P shows an extremely red continuum that is a signature of a high extinction (cf. CBET 2145); no clear spectral lines are visible, with the exception of the Ca II infrared triplet that confirms the supernova nature of 2010P. NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2010 CBAT 2010 January 28 (CBET 2149) Daniel W. E. Green