Circular No. 7605

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 2001ai NGC 5278

M. Modjaz and W. D. Li, University of California at Berkeley, on behalf of LOTOSS (cf. IAUC 7514), report the discovery of an apparent supernova on unfiltered CCD images taken on Mar. 28.4 (mag about 17.6) and 29.4 UT (mag about 17.5) with the 0.8-m Katzman Automatic Imaging Telescope. SN 2001ai is located at R.A. = 13h41m39s.35, Decl. = +55o40'05".1 (equinox 2000.0), which is 2".0 west and 9".0 south of the nucleus of NGC 5278. An unfiltered image taken by M. Schwartz with the Tenagra III 0.5-m automatic telescope on Mar. 19.4 showed nothing at this position (limiting mag about 19.0). NGC 5278 is one of an interacting connected pair of galaxies (with the center of NGC 5279 about 0'.5 away from that of NGC 5278).

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Host galaxy info: V = 7541 km/s, 1.3'x1.0', 13.6, SA(s)b?pec

SN type info: Ic

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