Electronic Telegram No. 447
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://cfa-www.harvard.edu/iau/cbat.html


SUPERNOVA 2006az IN NGC 4172
     A. Boselli, Laboratoire d'Astrophysique de Marseille; S. Benetti
and A. Harutyunyan, Osservatorio Astronomico di Padova, Istituto
Nazionale di Astrofisica; and M. Dennefeld, Insitut d'Astrophysique
de Paris, report that a spectrogram (range 370-780 nm, resolution 0.7
nm), obtained on Mar. 25.93 UT with the Carelec spectrograph on the
1.93-m telescope at Haute-Provence Observatory, shows that SN 2006az
(cf. IAUC 8691) is a type-Ia supernova with an age of 5 +/- 2 days
before maximum.  The expansion velocity, deduced from the Si II
635.5-nm absorption feature (which is weaker when compared with normal
type-Ia supernovae spectra), is about 10400 km/s (the recession
velocity of the parent galaxy is assumed to be 9274 km/s, from de
Vaucouleurs et al. 1991, Third Reference Cat. of Bright Galaxies, via
NED).


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2006 CBAT
2006 March 26                    (CBET 447)               Daniel W. E. Green