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 (firstname.lastname@example.org)
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.