ASAS-SN Discovery of A Probable Supernova in 2MASX J21303015-7038489

ATel #6493; J. Brimacombe (Coral Towers Observatory), T. W.-S. Holoien, K. Z. Stanek, C. S. Kochanek, A. B. Davis, U. Basu, J. F. Beacom (Ohio State), B. J. Shappee (Hubble Fellow, Carnegie Observatories), J. L. Prieto (Diego Portales, MAS), D. Bersier (LJMU), D. Szczygiel, G. Pojmanski (Warsaw University Observatory), E. Conseil (Association Francaise des Observateurs d'Etoiles Variables), S. Kiyota (Variable Star Observers League in Japan), I. Cruz (Cruz Observatory), L. A.G. Monard (Klein Karoo Observatory), J. Nicolas (Groupe SNAUDE, France), B. Nicholls (Mt. Vernon Obs., New Zealand)
on 24 Sep 2014; 17:42 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Thomas Holoien (tholoien@astronomy.ohio-state.edu)

Tweet

During the ongoing All Sky Automated Survey for SuperNovae (ASAS-SN or "Assassin"), using data from the double 14-cm "Cassius" telescope in Cerro Tololo, Chile, we discovered a new transient source, most likely a supernova, in the galaxy 2MASX J21303015-7038489:

 
Object       RA (J2000)     DEC (J2000)      Disc. UT Date   Disc. V mag 
ASASSN-14hp  21:30:31.42   -70:38:34.35      2014-09-22.13    16.7 

ASASSN-14hp was discovered in images obtained on UT 2014-09-22.13 at V~16.7 mag. We also detect the object in images obtained on UT 2014-09-22.10 (V~17.0), and UT 2014-09-21.11 (V~17.0). We do not detect (V>17.4) the object in images taken on UT 2014-09-20.13 and before. An image obtained by J. Brimacombe on UT 2014-09-23.66 with the RCOS 41-cm telescope near Siding Spring Observatory confirms the discovery of the transient. This figure shows the archival DSS image of the host (left) and the J. Brimacombe confirmation image (right). The red circle has a radius of 5" and is centered on the position of the transient in the J. Brimacombe image.

The ASAS-SN position of ASASSN-14hp is approximately 14.7" North and 6.0" East from the center of the galaxy 2MASX J21303015-7038489 (z=0.038920, d=164 Mpc, via NED), giving an absolute V-band magnitude of approximately -19.5 (m-M=36.07, A_V=0.095). 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.