ASAS-SN Discovery of A Possible Supernova or Large-Amplitude CV Outburst near 2MASX J14191396-3342342

ATel #6383; S. Kiyota (Variable Star Observers League in Japan), J. Brimacombe (Coral Towers Observatory), T. W.-S. Holoien, K. Z. Stanek, B. J. Shappee, A. B. Davis, C. S. Kochanek, U. Basu, J. F. Beacom (Ohio State), 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), W. Wiethoff (University of Minnesota, Duluth), L. A.G. Monard (Klein Karoo Observatory)
on 11 Aug 2014; 17:12 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Thomas Holoien (tholoien@astronomy.ohio-state.edu)

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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 or large-amplitude CV outburst, near the galaxy 2MASX J14191396-3342342:

 
Object       RA (J2000)     DEC (J2000)      Disc. UT Date   Disc. V mag 
ASASSN-14fg  14:19:15.98    -33:42:17.1      2014-08-10.02    16.0 

ASASSN-14fg was discovered in images obtained on UT 2014-08-10.02 at V~16.0 mag. We do not detect (V>16.6) the object in images taken on UT 2014-08-09.02 and before. Images obtained by S. Kiyota on UT 2014-08-10.37 using a 0.5m CDK + FLI PL-9000 at the ITelescope.NET site at Siding Springs Observatory and by J. Brimacombe on UT 2014-08-11.39 with the RCOS 41-cm telescope near Siding Spring Observatory confirm the discovery of the transient. This figure shows the archival DSS image (left), the S. Kiyota 2014-08-10 confirmation image (middle), and the J. Brimacombe 2014-08-11 confirmation image (right). The red circle has a radius of 5" and is centered on the position of the transient in the S. Kiyota image.

The position of ASASSN-14fg is approximately 30.4" from the center of the galaxy 2MASX J14191396-3342342 and approximately 37.7" from the center of the galaxy 2MASX J14191757-3341452, neither of which has a measured redshift in NED. Given this position, the transient could be a supernova associated with either galaxy. However, while there are no obvious matches to the coordinates of ASASSN-14fg in Vizier and no sources visible in the archival DSS image, a large-amplitude CV outburst is also a viable explanation for this transient.

Follow-up observations, especially spectroscopy, 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.