Circular No. 7596

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 2001ac IN NGC 3504

S. Beckmann and W. D. Li, University of California at Berkeley, on behalf of LOTOSS (cf. IAUC 7514), report the discovery of an apparent supernova (mag about 18.2) on unfiltered CCD images taken on Mar. 12.4 and 13.3 UT with the 0.8-m Katzman Automatic Imaging Telescope (KAIT). SN 2001ac is located at R.A. = 11h03m15s.37, Decl. = +27 58'29".5 (equinox 2000.0), which is 55".3 east and 9".1 north of the nucleus of NGC 3504. A KAIT image taken on Feb. 4.4 UT showed nothing at this position (limiting mag about 19.0).

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Host galaxy info: V = 1534 km/s, 2.7'x2.1', 11.67, R)SAB(s)ab HII

SN type info: IIn

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