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ASASSN-16ip: Discovery of A Probable Supernova in ESO_479-G_007

ATel #9353; J. Shields, J. S. Brown, K. Z. Stanek, T. W.-S. Holoien, C. S. Kochanek, U. Basu (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)
on 9 Aug 2016; 19:07 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Krzysztof Stanek (stanek.32@osu.edu)

Subjects: Optical, Supernovae

Referred to by ATel #: 9368

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 479-G007.

ASASSN-16ip (AT 2016euj) was discovered in images obtained on UT 2016-08-09.210 at V~16.3 mag. We also detect the object in images obtained on UT 2016-08-08.33 (V~16.8). We do not detect (V>17.5) the object in images taken on UT 2016-08-07.26 and before. This figure shows the archival DSS image of the host (left), the ASAS-SN V-band reference image (middle), and the ASAS-SN subtraction image (right). The red circle has a radius of 10" and is centered on the position of the transient in the subtraction image.

The position of ASASSN-16ip is approximately 1.6" South and 1.7" West from the center of the galaxy ESO 479-G007 (z=0.017, d=67.9 Mpc, via NED), giving an absolute V-band magnitude of approximately -17.9 (m-M=34.13, A_V=0.054). 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-16ip  02:27:21.70   -23:55:45.30     2016-08-09.210      16.3          -17.9               2.36 
 
Obs. UT Date         V mag 
2016-08-07.26        >17.5 
2016-08-08.33         16.8 
2016-08-09.21         16.3 

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.