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ASASSN-16nv: Discovery of A Probable Supernova in 2MASX J05482726-2319189

ATel #9804; J. Brimacombe (Coral Towers Observatory), J. S. Brown, T. W.-S. Holoien, K. Z. Stanek, 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), S. Kiyota (Variable Star Observers League in Japan), G. Stone (Sierra Remote Observatories)
on 29 Nov 2016; 17:13 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Jonathan Brown (brown@astronomy.ohio-state.edu)

Subjects: Optical, Supernovae, Transient

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 J05482726-2319189.

ASASSN-16nv (AT 2016ipi) was discovered in images obtained on UT 2016-11-27.210 at V~17.4 mag. We also detect the object in images obtained on UT 2016-11-25.17 (V~17.6). We do not detect (V>17.7) the object in images taken on UT 2016-11-22.28 and before. An image obtained on 2016-11-29 by J. Brimacombe confirms the discovery of the transient. This figure shows the archival DSS image of the host (left) and the J. Brimacombe confirmation image (right). The red circle has a radius of 5" and is centered on the position of the transient in the J. Brimacombe image.

The position of ASASSN-16nv is approximately 6.0" South and 3.5" West from the center of the galaxy 2MASX J05482726-2319189 (z=0.046072, d=197 Mpc, via NED), giving an absolute V-band magnitude of approximately -19.1 (m-M=36.38, A_V=0.084). 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-16nv  05:48:27.018   -23:19:25.39     2016-11-27.210      17.4          -19.1               6.95 
 
Obs. UT Date         V mag 
2016-11-22.28        >17.7 
2016-11-25.17         17.6 
2016-11-27.21         17.4 

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, 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.