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The Asiago Supernova Catalog (B/SN) is an astronomical catalog of known supernovae dating from 1885 to 2017, giving their parent galaxies. The original catalog was published in 1989 and an update in 1999. The catalog is online, including some post-1999 updates. The catalog was the effort of the Asiago Observatory, which carried out some of the relevant observations.
I presume that the catalog has ceased attempting to catalog all the ongoing supernova discoveries and the International Astronomical Union's Transient Name Server (TNS) has taken this role: current supernova searches using newer, very-effective technology now discover such a huge number of potential supernovae (optical transients) that collecting and tracking them, determining which reports are for the same transient, and tracking the efforts to classify them as supernova (versus some other phenomenon), all requires considerable collaborative effort, and the TNS includes automation to help carry this out.