2004IAUC.8288....2F

Filippenko, Chornock, and Foley add that inspection of CCD spectra, obtained on Feb. 13 UT with the Keck I 10-m telescope (+ LRIS; range 310-920 nm) and on Feb. 14 with the Keck II 10-m telescope (+ ESI; range 400-1000 nm), reveals that SN 2004F (cf. IAUC 8271) is a peculiar variety of type IIn, resembling SN 1994W and SN 1994ak (see Fig. 14 in Filippenko 1997, ARAA 35, 309). Very narrow H_alpha emission (FWHM about 1000 km/s) is visible, and the bottom of the corresponding P-Cyg absorption line indicates an expansion velocity of about 800 km/s. Narrow absorption lines (sometimes with associated emission) of Ca II, O I, Fe II, and Na I are also visible, and they indicate comparable expansion velocities. W. Li reports that the object faded from maximum brightness quite rapidly, according to KAIT photometry.