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ASAS-SN Discovery of A Probable Supernova in PGC 068269

ATel #6332; T. W.-S. Holoien, K. Z. Stanek, C. S. Kochanek, B. J. Shappee, A. B. Davis, J. Jencson, U. Basu, J. F. Beacom (Ohio State), J. L. Prieto (Diego Portales), D. Bersier (LJMU), J. Brimacombe (Coral Towers Observatory), D. Szczygiel, G. Pojmanski (Warsaw University Observatory)
on 21 Jul 2014; 15:29 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Thomas Holoien (tholoien@astronomy.ohio-state.edu)

Subjects: Optical, Supernovae, Transient

Referred to by ATel #: 6353

During the ongoing All Sky Automated Survey for SuperNovae (ASAS-SN or "Assassin"), using data from the recently commissioned double 14-cm "Cassius" telescope in Cerro Tololo, Chile, we discovered a new transient source, most likely a supernova, in the galaxy PGC 068269:

Object       RA (J2000)     DEC (J2000)      Disc. UT Date   Disc. V mag 
ASASSN-14ef  22:12:10.71    -27:49:43.37     2014-07-20.27      16.6 

ASASSN-14ef was discovered in images obtained 2014 UT July 20.27 at V~16.6 mag. We marginally detect the object at V~16.4 mag in images taken on 2014 UT July 17.25, but we do not detect (V>16.4) the object in images taken on 2014 UT July 11.16 and before. An image obtained on 2014 UT July 21.18 with the LCOGT 1-m robotic telescope in Sutherland, South Africa confirms the discovery of the transient. This figure shows the archival DSS image of the host (left) and the LCOGT g-band confirmation image (right). The red circle has a radius of 4" and is centered on the ASAS-SN position of the transient.

The ASAS-SN position of ASASSN-14ef is approximately 5" South and 3.7" East from the center of the galaxy PGC 068269 (z=0.028733, d=116 Mpc, via NED), giving an absolute V-band magnitude of approx. -18.8 (m-M=35.33, A_V=0.056, 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.