SN 2005U:

This SN was discovered by the Nuclear Supernova Search Campaign (K-band search in star burst galaxies, Mattila et al.) (IAUC 8473) on January 18, 2005, and absent on December 24, 2004, so discovered rather young.

The host galaxy ARP 229 is at z=0.010300 (NED).

Spectrum reported by Modjaz et al. shows this is a young (few weeks from explosion) type II SN.