Electronic Telegram No. 424 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 2006at B. Dintinjana and H. Mikuz, Crni Vrh Observatory, report their discovery of an apparent supernova (mag 17.1) on four unfiltered CCD images taken around Mar. 8.055 UT with a 0.60-m f/3.3 Cichocki reflector in the course of their 'Comet and Asteroid Search Program' (PIKA). The new object is located at R.A. = 13h12m41s.11, Decl. = +63o16'45".4 (equinox 2000.0), which is approximately 8".0 east and 10".5 north of the center of a nearby galaxy. Nothing is visible at this location on three consecutive PIKA R-band images obtained on Feb. 12.074 (limiting mag 18.5) or on a Digital Sky Survey (DSS) image from 1993 Mar. 19 (limiting blue mag stated as 19.6). H. Yamaoka, Kyushu University; and H. Naito and N. Tokimasa, Nishi-Harima Astronomical Observatory, report that a rather noisy, low-resolution spectrum (range 420-690 nm; R = 1000 at 500 nm) taken of 2006at on Mar. 8.8 UT with the 2.0-m NAYUTA telescope shows a rather featureless blue (blackbody-like) continuum with possible very broad features (either absorption valleys or emission troughs, which suggests that it may be a very young supernova. On the slit-viewer unfiltered image, the new object was at mag about 16.7. Nothing is visible at the location of 2006at on a DSS image from 1997 Apr. 13 (limiting red mag about 20); the host galaxy is hard to identify on the DSS image because it is very diffuse. A SDSS color-composite image taken in 2001 also shows no point source down to mag about 21. NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2006 CBAT 2006 March 9 (CBET 424) Daniel W. E. Green