Circular No. 7689

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 2001dt IN UGC 12558

W. D. Li, University of California at Berkeley, reports the discovery by LOTOSS (cf. IAUC 7514) of an apparent supernova (mag about 18.2) in unfiltered images taken with the Katzman Automatic Imaging Telescope (KAIT) on Aug. 23.4 and 24.4 UT. The new object is located at R.A. = 23h22m19s.17, Decl. = +50o09'25".3 (equinox 2000.0), which is 1".3 west and 8".0 south of the nucleus of UGC 12558. A KAIT image taken on Aug. 14.4 UT showed nothing at this position (limiting mag about 19.5).

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Host galaxy info: Vel = 8945 km/s, 1.0' x 0.6', 14.0, Scd:

SN type info: Ia

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