SN 1974C (type unknown, mag. 16.5) was discovered by Pieter van der Kruit andHalton Arp on 25 February 1974.[5][6] [Note: some sources incorrectly list the discovery date as 26 February.]
SN 1991N (Type Ib/c, mag. 15) was discovered by the Berkeley Automated Supernova Search on 29 March 1991 at an offset of5″ east and7″ south of the galactic nucleus.[7][8]
SN 2021gmj (Type IIP, mag.15.1) was discovered by theDistance Less Than 40 Mpc Survey (DLT40) on 20 March 2021.[9]
^Marsden, Brian G. (28 February 1974)."Circular No. 2641".Central Bureau for Astronomical Telegrams. Smithsonian Astrophysical Observatory,IAU. Retrieved4 August 2025.
^"SN1974C".Transient Name Server.IAU. Retrieved3 December 2024.