ASASSN-16go: Discovery of A Probable Supernova in 2MASX J13024397-2656276

ATel #9195; T. W.-S. Holoien, K. Z. Stanek, C. S. Kochanek, J. S. Brown, D. Godoy-Rivera, U. Basu (Ohio State), B. J. Shappee (Hubble Fellow, Carnegie Observatories), J. L. Prieto (Diego Portales; MAS), D. Bersier (LJMU), Subo Dong, Ping Chen (KIAA-PKU), J. Brimacombe (Coral Towers Observatory)
on 28 Jun 2016; 04:32 UT
Distributed as an Instant Email Notice Supernovae
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 quadruple 14-cm "Cassius" telescope in Cerro Tololo, Chile, we discovered a new transient source, most likely a supernova, in the galaxy 2MASX J13024397-2656276.

ASASSN-16go (AT 2016cyk) was discovered in images obtained on UT 2016-06-27.13 at V~16.4 mag. We do not detect (V>17.3) the object in images taken on UT 2016-06-20.07 and before. An image obtained on UT 2016-06-27 with the LCOGT 1-m telescope at Cerro Tololo, Chile 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 3" and is centered on the position of the transient in the LCOGT image.

The position of ASASSN-16go is approximately 0.9" North and 3.7" East from the center of the galaxy 2MASX J13024397-2656276 (z=0.016054, d=71.1 Mpc, via NED), giving an absolute V-band magnitude of approximately -18.1 (m-M=34.26, A_V=0.216). 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-16go  13:02:44.26    -26:56:26.81      2016-06-27.13      16.4          -18.1               3.81 

 
Obs. UT Date         V mag 
2016-06-20.07        >17.3 
2016-06-27.13         16.4 

Follow-up observations are encouraged.

While we are participating in the TNS system to minimize potential confusion, ASAS-SN will continue using ASASSN-16xx transient names as our primary nomenclature (including supernovae, but also other classes of transients), and we encourage others to do the same. We prefer merging the names as ASASSN-16xx (AT2016xyz) to preserve, rather than anonymize, the origin of the transient.

We thank LCOGT and its staff for their continued support of ASAS-SN. ASAS-SN is supported by NSF grant AST-1515927, the Center for Cosmology and AstroParticle Physics (CCAPP) at OSU, the Mt. Cuba Astronomical Foundation, George Skestos, 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.