ASAS-SN Discovery of A Probable Supernova in 6dF J1221502-241004
ATel #6283; T. W.-S. Holoien, B. J. Shappee, K. Z. Stanek, A. B. Davis, C. S. Kochanek, J. Jencson, U. Basu, J. F. Beacom (Ohio State), J. L. Prieto (Princeton/Diego Portales), D. Bersier (LJMU), J. Brimacombe (Coral Towers Observatory), D. Szczygiel, G. Pojmanski (Warsaw University Observatory)
on 30 Jun 2014; 21:37 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Thomas Holoien (firstname.lastname@example.org)
Subjects: Optical, Supernovae, Transient
Referred to by ATel #: 6293
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 6dF J1221502-241004:
Object RA (J2000) DEC (J2000) Disc. UT Date Disc. V mag
ASASSN-14dl 12:21:51.38 -24:09:54.0 2014-06-30.03 16.6
ASASSN-14dl was discovered in images obtained 2014 UT June 30.03 at V~16.6 mag. We do not detect (V>17.0) the object in images taken on 2014 UT June 27.03 and before. An image obtained on UT June 30.85 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 galaxy (left) and the LCOGT confirmation image (right). The red circle has a radius of 3" and is centered on the ASAS-SN position of the transient.
The ASAS-SN position of ASASSN-14dl is approximately 10.0" North and 16.1" East from the center of 6dF J1221502-241004 (z=0.013926, d=62.6 Mpc, via NED), giving an absolute V-band magnitude of approx. -17.6 (m-M=33.98, A_V=0.212, 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.