Electronic Telegram No. 565 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 2006dk IN NGC 4161 M. Dennefeld, Institut d'Astrophysique de Paris; J. M. Bonnet-Bidaud, Service d'Astrophysique, Saclay; and S. Benetti, E. Cappellaro, N. Elias-Rosa, and A. Harutyunyan, Osservatorio Astronomico di Padova, Istituto Nazionale di Astrofisica, report that a noisy spectrogram (range 368-732 nm, resolution 0.5 nm), obtained on June 26.92 UT with the Carelec spectrograph on the 1.93-m telescope at Haute-Provence Observatory, shows that SN 2006dk (cf. CBET 561) is a type-II supernova caught close to explosion. The spectrum is dominated by a relatively blue continuum having overimposed a broad and faint H-alpha emission (FWHM about 11700 km/s). A broad and faint He I 587.6-nm feature with a P-Cyg profile is also visible, and from its absorption an expansion velocity of about 11500 km/s is deduced (assuming a recession velocity of 4946 km/s from Falco et al. 1999, PASP 111, 438l; 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 NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars.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 June 27 (CBET 565) Daniel W. E. Green