Circular No. 7145

Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A. IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions) BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science) URL http://cfa-www.harvard.edu/iau/cbat.html Phone 617-495-7244/7440/7444 (for emergency use only)

SUPERNOVA 1999bu IN NGC 3786

W. D. Li, University of California at Berkeley, on behalf of the Lick Observatory Supernova Search (cf. IAUC 6627, 7126) with the 0.8-m Katzman Automatic Imaging Telescope (KAIT), reports the discovery of an apparent supernova in NGC 3786, a Seyfert galaxy that is in a pair of interacting galaxies (Arp 294 and NGC 3788). SN 1999bu was discovered on an unfiltered image taken on Apr. 16.3 UT (mag about 17.5). Inspection of earlier images taken by KAIT reveals that the supernova was barely visible on Mar. 13.3 and clearly present on Mar. 28.3 (mag about 17.6). The new object is located at R.A. = 11h39m42s.50, Decl. = +31o54'29".1 (equinox 2000.0), which is about 1".3 west and 3".1 south of the nucleus of NGC 3786. A KAIT image of the same field on Mar. 7.3 (limiting mag about 18.5) shows nothing at the position of the supernova.

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Host galaxy info: V = 2678 km/s, 2.2'x1.3', SAB(rs)a pec Sy1.8

SN type info: SN Ic

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