Electronic Telegram No. 2270
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
CBAT Director:  Daniel W. E. Green; Room 209; Dept. of Earth and Planetary
 Sciences; Harvard University; 20 Oxford St.; Cambridge, MA  02138; U.S.A.
e-mail:  cbat@iau.org; cbatiau@eps.harvard.edu
URL http://www.cfa.harvard.edu/iau/cbat.html


SUPERNOVA 2010cn
     G. H. Marion, Texas A&M University and University of Texas; J. Vinko,
University of Szeged; and J. C. Wheeler, University of Texas, report that a
spectrogram (range 430-1000 nm) of 2010cn (cf. CBET 2269), obtained on May
6.18 UT with the 9.2-m Hobby-Eberly Telescope (+ Marcario Low-Resolution
Spectrograph) by M. Shetrone, shows three broad, shallow features (at 484.6,
568.8, and 630.5 nm) superimposed on a blue continuum.  The redshift,
estimated from a narrow H-alpha emission line from the host galaxy, is 0.026.
From the SuperNova IDentification code (Blondin and Tonry 2007, Ap.J. 666,
1024), the best-matching template is that of SN 2006aj, a broad-line type-Ic
supernova, at five days before maximum light.  Comparison with a library of
supernovae spectra via the GELATO code (Harutyunyan et al. 2008, A.Ap. 488,
383) yields SN 1993J, a type-IIb supernova when close to maximum light, as
the best-resembling spectrum.


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2010 CBAT
2010 May 6                       (CBET 2270)              Daniel W. E. Green