2004IAUC.8381....2P

F. Patat and G. Pignata, European Southern Observatory; and S. Benetti, Istituto Nazionale di Astrofisica, on behalf of the ERTN (see IAUC 7954 and 8344 – not IAUC 8341, as cited incorrectly on IAUC 8378, 8379), report that a fully reduced spectrum (range 320-900 nm; resolution 1.6 nm) of SN 2004dn, obtained on Aug. 5.15 UT by J. Aceituno at the Calar Alto Observatory 2.2-m telescope (+ CAFOS), shows it to be a type-Ic supernova. The spectrum is very similar to those of the type-Ic SNe 1991A and 1994ai (Asiago-ESO supernova archive, unpublished; IAUC 5155, 6120), a few days before maximum light. Photospheric expansion velocities, deduced from the absorption minima of Si II 635.5-nm and O I 777.4-nm, are about 9600 km/s and 10700 km/s, respectively. The recession velocity of UGC 2069 at the supernova position, measured from the unresolved H_alpha and H_beta arising in the underlying H II region, is about 3950 km/s.