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ASAS-SN Discovery of a Candidate Supernova in Uncatalogued Galaxy

ATel #5460; J. L. Prieto (Princeton), K. Z. Stanek, B. J. Shappee, C. S. Kochanek, T. W-S. Holoien, J. Jencson, U. Basu, J. F. Beacom (Ohio State), D. Szczygiel, G. Pojmanski (Warsaw University Observatory), M. Dubberley, M. Elphick, S. Foale, E. Hawkins, D. Mullins, W. Rosing, R. Ross, Z. Walker (Las Cumbres Observatory), J. Brimacombe (Coral Towers Observatory), D. Berssier (LJMU)
on 10 Oct 2013; 23:59 UT
Credential Certification: Jose L. Prieto (jose@obs.carnegiescience.edu)

Subjects: Optical, Supernovae, Transient

Referred to by ATel #: 5469, 5508, 5707

During the ongoing All Sky Automated Survey for SuperNovae (ASAS-SN or "Assassin"), using data from the double 14-cm "Brutus" telescope in Haleakala, Hawaii, we discovered a new optical transient source, likely a supernova:

  
Object            RA(J2000)        Dec(J2000)      Disc. UT Date    Disc. V Mag   
ASASSN-13dl     07:38:49.54       +58:12:43.3      2013-10-10.51      16.76 
ASASSN-13dl was discovered in images obtained on UT Oct 10.51, but was also present in images obtained Oct. 4.5 at V~17 mag. The source was undetected (V>17 mag) in images obtained on Sep. 29 and earlier. This figure shows the ASAS-SN discovery image and an archival DSS image. The transient is approximately 2" from the center of an uncatalogued galaxy detected in DSS images.

For more information about the ASAS-SN project see the ASAS-SN Homepage and also ASAS-SN Transients page.