Circular No. 7922

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 2002dn IN IC 5145

W. D. Li, University of California at Berkeley (UCB), reports the LOTOSS (cf. IAUC 7906) discovery of a supernova on unfiltered KAIT CCD images taken on June 15.5 (mag about 18.6) and 17.5 UT (mag about 18.7). SN 2002dn is located at R.A. = 21h54m22s.47, Decl. = +15o09'42".2 (equinox 2000.0), which is 8".8 west and 18".3 north of the nucleus of IC 5145. A KAIT image taken on May 31.5 showed nothing at this position (limiting mag about 19.0). A. V. Filippenko, R. Chornock, and R. J. Foley (UCB) report that inspection of a CCD spectrum (range 330-1000 nm), obtained on June 17 UT with the Shane 3-m reflector at Lick Observatory, shows that SN 2002dn is a supernova, probably of type Ic, resembling SN 1987M about 1-2 weeks past maximum brightness (Filippenko et al. 1990, A.J. 100, 1575). The Ca II near-infrared triplet and O I 777.4-nm troughs are strong, and the Si II 635.5-nm absorption line is unusually prominent for a type-Ic object.

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Host galaxy info: vel = 7355 km/s, 1.6 x 0.9, 14.30, Sab

SN type info: Ic

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