Circular No. 7554

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 2001A IN NGC 4261

M. Modjaz and W. D. Li, University of California at Berkeley; and M. Schwartz, Cottage Grove, OR, report the discovery of an apparent supernova (mag about 18.9) by LOTOSS (cf. IAUC 7514) on an unfiltered image taken on Jan. 1.5 UT with the 0.8-m Katzman Automatic Imaging Telescope (KAIT). SN 2001A, confirmed on an image taken on 2000 Dec. 29.5 UT (mag about 18.8) and an image taken with the 0.5-m Tenagra III automatic telescope on Dec. 15.5 (mag about 18.4), is located at R.A. = 12h19m23s.01, Decl. = +5 49'40".5 (equinox 2000.0), which is 3".1 west and 10".7 north of the nucleus of NGC 4261. The photometry and astrometry of the new object were measured after subtracting the combined image of the new observations from the KAIT observations in May 2000 (limiting mag about 21.0), which showed nothing at the position of the supernova.

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Host galaxy info: V = 2238 km/s, 4.1'x3.6', 11.41, E2-3 LINER

SN type info: Ia

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