[IAUC] CBET 2126: 20100116 : SUPERNOVA 2010G

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                                                  Electronic Telegram No. 2126
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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SUPERNOVA 2010G
     W. Zheng, University of Michigan; E. Chatzopoulos, University of Texas;
J. Vinko, University of Szeged; R. Quimby, California Institute of Technology;
F. Yuan, D. Chamarro, M. D. Sisson, N. Whallon, C. Akerlof, and S. B. Pandey,
University of Michigan; J. C. Wheeler, University of Texas; and G. H. Marion,
Texas A&M University and University of Texas, on behalf of the ROTSE
collaboration, report the discovery of a new supernova (mag about 19.4) in
unfiltered images taken on Jan. 9.46 UT with the 0.45-m ROTSE-IIIb telescope
at McDonald Observatory.  The new object, which was observed again on Jan.
10.46 at mag 19.1 and on Jan. 13.39 at mag 19.5, is located at R.A. =
12h25m10s.01, Decl. = +45o19'43".9 (equinox 2000.0; uncertainty about 1"),
which is 0".5 west and 1".5 south of the center of the host galaxy, SDSS
J122510.05+451945.3; a finding chart for the object can be found at website
URL http://www.rotse.net/rsvp/j122510.0+451944/j122510.0+451944.jpg.
     A spectrum obtained on Jan. 12.3 with the 9.2-m Hobby-Eberly Telescope
(+ Marcario Low-Resolution Spectrograph) by S. C. Odewahn shows 2010G to be a
normal type-Ia supernova at maximum.  According to SNID (Blondin and Tonry
2007, Ap.J. 666, 1024), the spectrum best resembles that of SN 1998aq at one
day before maximum brighness, at a redshift of z = 0.115.  The photometric
measurements are also consistent with a normal type-Ia supernova near
maximum at this redshift.  The rest-frame photospheric velocity, estimated
from the minimum of the Si II 635.5-nm feature is about 10000 km/s.


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                         (C) Copyright 2010 CBAT
2010 January 16                  (CBET 2126)              Daniel W. E. Green