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ASAS-SN Discovery of A Probable Supernova in 2MASX J04225455-5230097

ATel #8211; J. S. Brown (Ohio State), Subo Dong (KIAA-PKU), K. Z. Stanek, T. W.-S. Holoien, C. S. Kochanek, D. Godoy-Rivera, U. Basu (Ohio State), B. J. Shappee (Hubble Fellow, Carnegie Observatories), J. L. Prieto (Diego Portales; MAS), D. Bersier (LJMU), Ping Chen (KIAA-PKU), J. Brimacombe (Coral Towers Observatory)
on 24 Oct 2015; 15:53 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Jonathan Brown (brown@astronomy.ohio-state.edu)

Subjects: Optical, Supernovae, Transient

Referred to by ATel #: 8225

During the ongoing All Sky Automated Survey for SuperNovae (ASAS-SN or "Assassin"), using data from the quadruple 14-cm "Cassius" telescope in Cerro Tololo, Chile, we discovered a new transient source, most likely a supernova, in the galaxy 2MASX J04225455-5230097.

ASASSN-15rv was discovered in images obtained on UT 2015-10-24.19 at V~16.8 mag. We also detect the object in images obtained on UT 2015-10-22.13 (V~17.0) and UT 2015-10-16.25 (V~17.2). We do not detect (V>17.6) the object in images taken on UT 2015-10-08.18 and before. An image obtained on 2015-10-24 with the LCOGT 1-m robotic telescope at Cerro Tololo confirms the discovery of the transient. This figure shows the archival DSS image of the host (left) and the LCOGT V-band confirmation image (right). The red circle has a radius of 5" and is centered on the position of the transient in the LCOGT image.

The position of ASASSN-15rv is approximately 1.52" South and 10.01" East from the center of the galaxy 2MASX J04225455-5230097 (no redshift information available from NED). Properties of the new source and photometry are summarized in the tables below:

Object       RA (J2000)     DEC (J2000)      Disc. UT Date   Disc. V mag  Approx. Abs. Mag   Offset from Host (") 
ASASSN-15rv  04:22:55.23    -52:30:11.12      2015-10-24.19      16.8          N/A               10.12 
Obs. UT Date         V mag 
2015-10-08.18        >17.6 
2015-10-16.25         17.2 
2015-10-22.13         17.0 
2015-10-24.19         16.8 

Follow-up observations are encouraged.

We thank LCOGT and its staff for their continued support of ASAS-SN. ASAS-SN is supported by NSF grant AST-1515927, the Mt. Cuba Astronomical Foundation, the Center for Cosmology and AstroParticle Physics (CCAPP) at OSU, and the Robert Martin Ayers Sciences Fund. For more information about the ASAS-SN project, see the ASAS-SN Homepage and the list of all ASAS-SN transients.