Circular No. 7611

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 2001ay IN IC 4423

B. Swift and W. D. Li, University of California at Berkeley, report the discovery by LOTOSS (cf. IAUC 7514) of an apparent supernova (mag about 16.9) on an unfiltered CCD image taken on Apr. 18.4 UT with the 0.8-m Katzman Automatic Imaging Telescope (KAIT). SN 2001ay, which was confirmed at mag about 17.0 on an image taken on Apr. 19.2 by M. Schwartz with the 0.5-m Tenagra III automatic telescope, is located at R.A. = 14h26m17s.00, Decl. = +26o14'55".8 (equinox 2000.0), which is 10".3 west and 9".3 north of the nucleus of IC 4423. A KAIT image of the same field taken on Apr. 4.4 showed nothing at this position (limiting mag about 18.5).

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Host galaxy info: V = 9067 km/s, 1.1'x0.6', 15.0, S?

SN type info: Ia

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