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      superseded by text appearing later in the printed IAU Circulars.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