Electronic Telegram No. 2056
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)
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SUPERNOVA 2009ly
     W. Zheng, F. Yuan, University of Michigan; J. Vinko, University of
Szeged; R. Quimby, California Institute of Technology; D. Chamarro, M. D.
Sisson, N. Whallon, C. Akerlof, and S. B. Pandey, University of Michigan;
and J. C. Wheeler and E. Chatzopoulos, University of Texas, on behalf of the
ROTSE collaboration, report the discovery of a type-Ia supernova (mag about
19.0) in unfiltered images taken on Nov. 6.87 UT with the 0.45-m ROTSE-IIIc
telescope at the H.E.S.S. site in Namibia.  The new object, which was
observed again a week later at mag about 18.4, is located at R.A. =
0h41m12s.70, Decl. = -9o08'53".0 (equinox 2000.0; uncertainty about 1"),
which is 3".2 west and 7".2 north of the center of the galaxy SDSS
J004112.90-090900.4, at a redshift of z = 0.053 (according to the Sloan
Digital Sky Survey database).  A finding chart for the object can be found
at http://www.rotse.net/rsvp/j004112.7-090853/j004112.7-090853.jpg.
An HET/LRS spectrum obtained by S. C. Odewahn on Nov. 23.13 UT shows 2009ly
to be a type-Ia supernova, 2-3 weeks after maximum light.  According to SNID,
the spectrum best resembles those of SN 1981B (24 days after maximum) and SN
1994D (+14 days) at redshift z = 0.053, the same as the host galaxy from SDSS.
The Si II 635.5-nm line appears to be slightly blended with Fe II.  The
photospheric velocity, estimated from the minimum of the Si II 635.5-nm
feature, and corrected for the host-galaxy redshift, is about 10000 km/s.


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                         (C) Copyright 2009 CBAT
2009 November 28                 (CBET 2056)              Daniel W. E. Green