ASASSN-16mv: Discovery of A Probable Supernova in ESO 563- G 035

ATel #9713; B. Nicholls (Mt. Vernon Obs., New Zealand), J. Shields, K. Z. Stanek, C. S. Kochanek, J. S. Brown, , T. W.-S. Holoien (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), J. Brimacombe (Coral Towers Observatory), G. Stone (Sierra Remote Observatories), R. S. Post (Post Astronomy), G. Masi (Virtual Telescope Project, Ceccano, Italy), R. A. Koff (Antelope Hills Observatory)
on 4 Nov 2016; 19:52 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Krzysztof Stanek (stanek.32@osu.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 ESO 563- G 035.

ASASSN-16mv was discovered in images obtained on UT 2016-11-04.31 at V~16.8 mag. We also detect the object in images obtained on several previous epochs. We do not detect (V>17.4) the object in images taken on UT 2016-10-26.31 and before. An image obtained on 2016-11-04 by B. Nicholls confirms the discovery of the transient. This figure shows the archival DSS image of the host (left) and the B. Nicholls confirmation image (right). The red circle has a radius of 5" and is centered on the position of the transient in the B. Nicholls image.

The position of ASASSN-16mv is approximately 8.4" South and 17.05" West from the center of the galaxy ESO 563- G 035 (z=0.018556, d=81.6 Mpc, via NED), giving an absolute V-band magnitude of approximately -18.25 (m-M=34.56, A_V=0.48). 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-16mv  08:57:05.211   -20:02:05.79       2016-11-04.27    16.8          -18.25               19.0 

 
Obs. UT Date       V mag 
2016-10-26.31      >17.43   
2016-10-29.30       16.96   
2016-11-01.29       16.74   
2016-11-04.31       16.75   

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.