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ASAS-SN Discovery of A Probable Supernova in 2MASX J01504127-1431032

ATel #6500; J. Nicolas (Groupe SNAUDE, France), E. Y. Hsiao (Aarhus University), C. Gonzalez, C. Contreras (Las Campanas Observatory), S. Kiyota (Variable Star Observers League in Japan), 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), I. Cruz (Cruz Observatory), L. A.G. Monard (Klein Karoo Observatory), B. Nicholls (Mt. Vernon Obs., New Zealand), J. Hissong (Columbus Astronomical Society)
on 26 Sep 2014; 17:54 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 #: 6508

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 J01504127-1431032:

Object       RA (J2000)     DEC (J2000)      Disc. UT Date   Disc. V mag 
ASASSN-14hr  01:50:41.23    -14:31:04.75     2014-09-25.39    16.5 

ASASSN-14hr was discovered in images obtained on UT 2014-09-25.39 at V~16.5 mag. We do not detect (V>17.2) the object in images taken on UT 2014-09-20.22 and before. Images obtained by J. Nicolas on UT 2014-09-26.10 with the 0.41-m telescope at Observatoire Chante-Perdrix-Dauban, France, with the Swope 1-m telescope on UT 2014-09-26.49, by S. Kiyota on UT 2014-09-26.51 using a 0.5m CDK + FLI PL-9000 at the ITelescope.NET site at Siding Springs Observatory, and by J. Brimacombe on UT 2014-09-26.56 with the RCOS 41-cm telescope near Siding Spring Observatory confirm the discovery of the transient. This figure shows the archival DSS image of the host (left) and the Swope 1-m confirmation image (right). The red arrow indicates the position of the transient.

The ASAS-SN position of ASASSN-14hr is approximately 1.5" South and 0.6" West from the center of the galaxy 2MASX J01504127-1431032 (z=0.033620, d=138 Mpc, via NED), giving an absolute V-band magnitude of approximately -19.2 (m-M=35.70, A_V=0.041). 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.