ASASSN-16kv: Discovery of A Probable Supernova in 2MASX J05073951-1932539

ATel #9560; J. Brimacombe (Coral Towers Observatory), R. S. Post (Post Astronomy), J. S. Brown, K. Z. Stanek, T. W.-S. Holoien, C. S. Kochanek, J. Shields (Ohio State), B. J. Shappee (Hubble Fellow, Carnegie Observatories), J. L. Prieto (Diego Portales; MAS), D. Bersier (LJMU), Subo Dong, S. Bose, Ping Chen (KIAA-PKU), B. Nicholls (Mt. Vernon Obs., New Zealand)
on 28 Sep 2016; 17:23 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Jonathan Brown (brown@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 J05073951-1932539.

ASASSN-16kv (AT 2016gqb) was discovered in images obtained on UT 2016-09-27.23 at V~17.1 mag. We also detect the object in images obtained on UT 2016-09-28.26 (V~16.7), UT 2016-09-24.25 (V~17.4), and UT 2016-09-23.32 (V~17.4). We do not detect (V>17.4) the object in images taken on UT 2016-09-21.32 and before. Follow-up images confirm the discovery of the transient. This figure shows the archival DSS image of the host (left) and the LCOGT 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-16kv is approximately 1.3" South and 0.3" West from the center of the galaxy 2MASX J05073951-1932539 (z=0.030434, d=128 Mpc, via NED), giving an absolute V-band magnitude of approximately -18.5 (m-M=35.47, A_V=0.114). 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-16kv  05:07:39.480   -19:32:55.90     2016-09-27.23      17.1          -18.5               1.33 

 
Obs. UT Date         V mag 
2016-09-21.32        >17.4 
2016-09-23.32         17.4 
2016-09-24.25         17.4 
2016-09-27.23         17.1 
2016-09-28.26         16.7 

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, and the Mt. Cuba Astronomical Foundation. For more information about the ASAS-SN project, see the ASAS-SN Homepage and the list of all ASAS-SN transients.