Electronic Telegram No. 1755
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 2009cy
     M. Catelan, Pontificia Universidad Catolica de Chile; A. J. Drake, S. G.
Djorgovski, R. Williams, M. J. Graham, and A. Mahabal, California Institute of
Technology; E. C. Beshore, S. M. Larson, and R. Kowalski, Lunar and Planetary
Laboratory, University of Arizona; and E. Christensen, Gemini Observatory,
report the CRTS (cf. CBET 1744) discovery of a supernova in unfiltered
Catalina Sky Survey (CSS) images:

 SN       2009 UT        R.A. (2000.0) Decl.     Mag.      Offset
 2009cy   Mar. 18.20   9 40 55.44  + 1 16 08.3   17.2    2".7 W, 3".4 N

Further CSS magnitudes for 2009cy:  Jan. 17.53 UT, [20.0; Feb. 2.31, 17.0;
14.42, 16.9; 19.27, 17.1; Mar. 31.22, 17.3.  The apparent host galaxy, SDSS
J094055.62+011604.9, has Gunn magnitudes u = 21.5, g = 20.6, r = 20.3, i =
20.2, and z = 19.8.  A confirming spectrogram (range 380-900 nm) was taken
with the SMARTS 1.5-m telescope on Mar. 26; with the aid of the "Supernova
Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024), 2009cy
is found to be a type-IIP supernova, its spectrum similar to that of SN 2006bp.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2009 CBAT
2009 April 6                     (CBET 1755)              Daniel W. E. Green