[IAUC] CBET 1178: 20071224 : SUPERNOVA 2007su

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                                                  Electronic Telegram No. 1178
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 2007su
     F. Yuan, University of Michigan; R. Quimby, California Institute of
Technology; C. Akerlof, University of Michigan; and J. C. Wheeler, University
of Texas, on behalf of the ROTSE collaboration, report the discovery of a
supernova in unfiltered CCD images taken with the 0.45-m ROTSE-IIIb telescope
at McDonald Observatory on Dec. 19.10 (at mag about 17.1) and 21.09 UT (mag
about 16.9).  The new object is located at R.A. = 22h19m08s.88, Decl. =
+13o10'40".3 (equinox 2000.0; uncertainty < 1"), which is 0".4 east and 0".2
south of the center of the apparent host galaxy.  A spectrogram (range 420-890
nm) of 2007su, obtained on Dec. 23.05 with the 9.2-m Hobby-Eberly Telescope (+
Marcario Low-Resolution Spectrograph) by M. Shetrone and F. Deglman, shows it
to be a type-Ia supernova around maximum light.  Adopting the recession
velocity of the host galaxy (z = 0.028, apparently taken from the Sloan
Digital Sky Survey), the minimum of the Si II 635.5-nm feature is blushifted
by 11700 km/s.  A finding chart of 2007su can be found at this website URL:
http://www.rotse.net/rsvp/j221908+131040/j221908.9+131040.jpg.


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                         (C) Copyright 2007 CBAT
2007 December 24                 (CBET 1178)              Daniel W. E. Green