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ASAS-SN Discovery of A Likely Supernova in PGC 056486

ATel #6245; J. Brimacombe (Coral Towers Observatory), K. Z. Stanek, C. S. Kochanek, B. J. Shappee, T. W.-S. Holoien, A. B. Davis, J. Jencson, U. Basu, J. F. Beacom (Ohio State), J. L. Prieto (Princeton/Diego Portales), D. Szczygiel, G. Pojmanski (Warsaw University Observatory), D. Bersier (LJMU)
on 18 Jun 2014; 13:39 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Krzysztof Stanek (stanek.32@osu.edu)

Subjects: Optical, Supernovae, Transient

During the ongoing All Sky Automated Survey for SuperNovae (ASAS-SN or "Assassin"), using data from the quadruple 14-cm "Brutus" telescope in Haleakala, Hawaii, we discovered a likely supernova in PGC 056486

Object         RA (J2000)     DEC (J2000)     Disc. UT Date    Disc. V mag 
ASASSN-14co    15:57:29.91   +01:06:33.74     2014-06-17.36     16.85 
ASASSN-14co was discovered in "Brutus" images obtained on 2014-06-17.36 at V~16.85 mag. We also, marginally in both cases, detect the transient in images obtained on 2014-06-16.45 (V~16.95 mag) and 2014-06-06.38 (V~17.1 mag), and do not detect (V>17.5) this object in images taken on 2014-06-02.39 and before. An image taken on UT 2014-06-18.3 with the RCOS 51-cm telescope in New Mexico (4 x 10 min exposures) confirms the discovery of the transient. This figure shows the RCOS confirmation image, with the red circle with a radius of 1.5" plotted at the position of the SN candidate derived from the RCOS image and reported above.

The transient's position is approximately 11" away from the center of PGC 056486 (z=0.03334, d=142 Mpc, via NED), giving an absolute V-band magnitude of approx. -19.15 (m-M=35.76, A_V=0.26, Schlafly & Finkbeiner 2011). Follow-up observations are encouraged.

We thank LCOGT and its staff for their continued support of ASAS-SN. For more information about the ASAS-SN project, see the ASAS-SN Homepage and the list of all ASAS-SN transients.