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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