2004IAUC.8388....3F

Filippenko, R. J. Foley (UCB), and Li add that inspection of CCD spectra (range 320-930 nm), obtained by C. Fassnacht and J. McKean (University of California, Davis) on Aug. 13 UT with the Keck-I 10-m telescope (+ LRIS), shows that SN 2004du (IAUC 8387) is a young type-IIn supernova. Very weak, narrow H_alpha emission is superposed on a featureless, extremely blue continuum. There is a hint of H_beta and He I 587.6-nm emission, as well.