[IAUC] CBET 2060: 20091201 : SUPERNOVA 2009mc

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                                                  Electronic Telegram No. 2060
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 2009mc
     Further to CBET 2059, M. Catelan, Pontificia Universidad Catolica de
Chile; A. J. Drake, S. G. Djorgovski, A. Mahabal, M. J. Graham and R.
Williams, California Institute of Technology; E. C. Beshore and S. M. Larson,
Lunar and Planetary Laboratory, University of Arizona; and E. Christensen,
Gemini Observatory, report the CRTS discovery of a supernova in unfiltered
Catalina Sky Survey (CSS) images:

    SN       2009 UT        R.A. (2000.0) Decl.      Mag.
    2009mc   Nov. 21.51    8 55 59.81  - 5 19 44.6   18.1

Further magnitudes for 2009mc:  Oct. 27.52 UT, [19.5 (CSS); Nov. 24.54, 17.7
(S. Howerton, Arkansas City, KS, U.S.A., remotely using the 0.3-m LB-0003
telescope near Rodeo, NM, U.S.A.).  A deep r-band image from 2006 Jan. 2
with the 3.6-m Canada-France-Hawaii Telescope telescope clearly shows a galaxy
(of mag approx 22) at the location of 2009mc.  A noisy spectrogram (range
380-900 nm) of 2009mc exhibiting clear, broad absorption features was obtained
with the SMARTS 1.5-m telescope on 2009 Nov. 30.25; cross-correlation with a
library of supernova spectra using the "SuperNova IDentification" code
(Blondin and Tonry 2007, Ap.J. 666, 1024) shows 2009mc to be most similar to
the type-Ia supernova 1996C at one week past maximum light.


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                         (C) Copyright 2009 CBAT
2009 December 1                  (CBET 2060)              Daniel W. E. Green