Circular No. 6993

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 1998dm IN MCG -01-4-44

M. Modjaz, T. Shefler, E. Halderson, J. Y. King, W. D. Li, 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). SN 1998dm was found and confirmed on unfiltered images taken on Aug. 22.5 (mag about 16.8) and 23.4 UT (mag about 16.5). The new object is located at R.A. = 1h26m13s.97, Decl. = -6o06'14".0 (equinox 2000.0), which is about 13".8 west and 37".0 south of the nucleus of MCG -01-4-44 (= UGCA 17). A KAIT image obtained on Aug. 17.5 shows no star at this position (limiting mag about 18.5).

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Host galaxy info: V = 1968 km/s, 2.9x0.4', SBc:

SN type info: SN Ia

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