[IAUC] CBET 1763: 20090414 : SUPERNOVA 2009cz IN NGC 2789

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                                                  Electronic Telegram No. 1763
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 2009cz IN NGC 2789
      E. Kankare and S. Mattila, Tuorla Observatory, University of Turku,
report that they obtained a low-resolution spectrum of 2009cz (cf. CBET 1759)
on Apr. 13.2 UT with the Nordic Optical Telescope (+ ALFOSC; range 320-910
nm).  The spectrum of 2009cz shows it to be a type-Ia supernova well before
maximum light.  Adopting a host-galaxy recession velocity of 6337 km/s
(Mahdavi and Geller 2004, Ap.J. 607, 202), the Si II 635.5-nm absorption
minimum is measured to be blue-shifted by roughly 13000 km/s, and its
profile appears flat-bottomed.  The measured R-band magnitude of 16.0 for
2009cz corresponds to an absolute magnitude of -18.7, assuming a distance of
87 Mpc (H_o = 73.00 km/s/Mpc).


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                         (C) Copyright 2009 CBAT
2009 April 14                    (CBET 1763)              Daniel W. E. Green