Supernova 2007sr in the Antennae (NGC 4038) has been confirmed as a type-Ia. Swift Ultraviolet/Optical satellite telescope observations on 21st December show a magnitude V = 12.9±0.1
Catalina Sky Survey Optical Transient with the Mt. Bigelow 0.8m Catalina Schmidt Telescope. The Magnitude: (V ~ 13) object is on the edge of a spiral arm on the Antennae Galaxies
Detection Date: 2007-12-18 12:49:10 UT Date: 2007-12-18 UT 12:49:10 Position: RA 12:01:52.80 Dec-18:58:21.72 VOEvent ID: 712180180624111439