ASASSN-13co was discovered on August 30th, 2013, one of two SNe we discovered that day, which still doesn't happen for us that often. Our 9th supernova discovery, ASASSN-13co, was also our first non-Type Ia supernova, and was about 90 Megaparsecs away, quite a bit further than we expected to find core-collapse Type IIP SNe. We have obtained extensive follow-up data for that event, and our results were just reported in Holoien et al. (2013c) paper (see also Tom's OSU Astronomy Coffee Brief for additional details).

We compared ASASSN-13co to other Type II supernovae and showed that it was a unique event that was not only unusually bright for a Type II supernova but also exhibited an atypical light curve shape that does not cleanly match that of either a standard Type II-L or Type II-P supernova. The fact that we are discovering such unusual events so early in our project is again very encouraging, as it means that we are already exploring new discovery space. Stay tuned for other unusual ASAS-SN events to be reported!