Circular No. 7508

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 2000dt IN UGC 3411

G. M. Hurst, Basingstoke, England, reports the discovery by M. Armstrong, Rolvenden, of an apparent supernova (mag 17.5) on unfiltered CCD images (limiting mag 19.5) taken with a 0.35-m Schmidt-Cassegrain telescope in the course of the U.K. Nova/ Supernova Patrol on Oct. 13.058, 13.914, and 14.019 UT. SN 2000dt is located at R.A. = 6h10m54s.68, Decl. = +62o01'27".2 (equinox 2000.0), which is 2" west and 16" north of the center of UGC 3411. The new object appears neither on a CCD image taken by Armstrong on Sept. 21 (limiting mag 19.5), nor on the following Palomar Sky Survey images: 1990 Jan. 1 (red, limiting mag 20.8); 1993 Oct. 12 and Dec. 6 (blue, limiting mag 22.5); and 1996 Oct. 16 and Dec. 2 (red, limiting mag 20.8).

Y. Sato and W. D. Li, University of California at Berkeley, on behalf of the Lick Observatory Supernova Search (cf. IAUC 6627, 7126), report their independent discovery of SN 2000dt with the 0.8-m Katzman Automatic Imaging Telescope (KAIT) on unfiltered images taken on Oct. 14.4 (mag about 17.8) and 15.4 UT (mag about 17.9), providing position end figures 54s.68, 27".4 (or 1".3 west and 15".0 north of the nucleus of UGC 3411). A KAIT image of the same field taken on Mar. 21.1 showed nothing at the position of SN 2000dt (limiting mag about 19.0).

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Host galaxy info: V = 6798 km/s; 1.7' x 1.1'; 15.1; Scd?

SN type info: Ib

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