[IAUC] CBET 2386: 20100721 : SUPERNOVA 2010gn

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                                                  Electronic Telegram No. 2386
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 en iau.org; cbatiau en eps.harvard.edu
URL http://www.cfa.harvard.edu/iau/cbat.html


SUPERNOVA 2010gn
     J. Vinko, University of Szeged; G. H. Marion, Harvard-Smithsonian Center
for Astrophysics and University of Texas; and J. C. Wheeler, University of
Texas, report that the possible supernova reported on CBET 2385 is indeed a
type-Ia supernova.  A spectrum, obtained on July 21.28 UT with the 9.2-m
Hobby-Eberly Telescope (+ Marcario Low-Resolution Spectrograph) by S.
Rostopchin, shows broad features of Si II, S II, Fe II, and Ca II,
characteristic of type-Ia supernovae near maximum.  According to SNID (Blondin
and Tonry 2007, Ap.J. 666, 1024), the best resembling template spectrum is
that of SN 1996X, about one week after maximum light.  The median redshift
estimated by SNID is z = 0.0365 +/- 0.0058.  Adopting this redshift value,
the expansion velocity, from the absorption minimum of the Si II 635.5-nm
feature, is 11500 km/s.


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                         (C) Copyright 2010 CBAT
2010 July 21                     (CBET 2386)              Daniel W. E. Green