Circular No. 6958

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 1998cu IN IC 1525

W. D. Li, M. Modjaz, R. R. Treffers, and A. V. Filippenko, University of California at Berkeley, report their discovery of an apparent supernova during the course of the Lick Observatory Supernova Search (cf. IAUC 6627) with the 0.8-m Katzman Automatic Imaging Telescope (KAIT), as part of a cooperative program with the Beijing Astronomical Observatory (BAO) Supernova Survey (cf. IAUC 6379). SN 1998cu was found and confirmed in unfiltered CCD images obtained on June 29.4 (mag about 18.4) and 30.4 UT (mag about 18.1). The new object is located at R.A. = 23h59m12s.95, Decl. = +46o52'31".8 (equinox 2000.0), which is about 29".2 west and 50".3 south of the nucleus of IC 1525. BAO images (limiting mag about 18.5) obtained on May 29 and June 17 do not show a star at the position of the supernova; a KAIT image of IC 1525 taken on 1997 Dec. 26 (limiting mag about 19.0) also shows nothing at this position.

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Host galaxy info: V = 5022 km/s, 1.9'x1.4', SBb

SN type info: SN II

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