Circular No. 8286

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)

SUPERNOVAE 2004T, 2004U, AND 2004W

     Further to IAUC 8277, M. Moore and W. Li report the LOSS
     discovery of a supernova, designated SN 2004W and located at R.A. =
     12h43m36s.52, Decl. = +11o31'50".8 (equinox 2000.0), which is 51".6
     west and 78".7 south of the nucleus of NGC 4649.  Approximate KAIT
     magnitudes:  2003 June 4.2 UT, [20.0; 2004 Jan. 28.5, 18.8; 29.5,
     18.9; Feb. 11.5, 19.3.  A. V. Filippenko, R. Chornock, and R. J.
     Foley, University of California at Berkeley, report that inspection
     of CCD spectra (range 310-920 nm), obtained on Feb. 13 with the
     Keck I 10-m telescope (+ LRIS), shows that SN 2004W is of type Ia,
     specifically the underluminous SN 1991bg variety (Filippenko et al.
     1992, A.J. 104, 1543; Ruiz-Lapuente et al. 1993, Nature 365, 728),
     roughly half a year past maximum brightness.  The spectrum is
     dominated by very strong, broad [Ca II] 730-nm emission, with
     weaker iron emission lines at blue and visual wavelengths, as well
     as the Ca II near-infrared triplet.

Host galaxy info: vel = 6437 km/s, 1.1 x 1.0, 15.1, Sb

SN type info: Ia

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