Electronic Telegram No. 551 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 2006db S. Blondin, M. Modjaz, R. Kirshner, and P. Challis, Harvard-Smithsonian Center for Astrophysics, report that a spectrum (range 350-740 nm) of SN 2006db (cf. CBET 548), obtained on June 19.21 UT by M. Clakins with the F. L. Whipple Observatory 1.5-m telescope (+ FAST), shows it to be a type-IIn supernova around one week past explosion. The spectrum consists of a blue continuum, and narrow emission lines of the Balmer series (e.g., H_alpha, 500 km/s FWHM), characteristic of type-IIn supernovae. NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2006 CBAT 2006 June 20 (CBET 551) Daniel W. E. Green