Electronic Telegram No. 1763
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)
URL http://www.cfa.harvard.edu/iau/cbat.html


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).


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      superseded by text appearing later in the printed IAU Circulars.

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