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ASAS-SN Discovery of A Probable Supernova in VV 839

ATel #8491; E. Conseil (Association Francaise des Observateurs d'Etoiles Variables), Subo Dong ((KIAA-PKU), J. S. Brown, K. Z. Stanek, T. W.-S. Holoien, C. S. Kochanek, D. Godoy-Rivera, U. Basu (Ohio State), B. J. Shappee (Hubble Fellow, Carnegie Observatories), J. L. Prieto (Diego Portales; MAS), D. Bersier (LJMU), Ping Chen (KIAA-PKU), J. Brimacombe (Coral Towers Observatory)
on 1 Jan 2016; 09:14 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Subo Dong (dongsubo@pku.edu.cn)

Subjects: Optical, Supernovae

During the ongoing All Sky Automated Survey for SuperNovae (ASAS-SN or "Assassin"), using data from the quadruple 14-cm "Brutus" telescope in Haleakala, Hawaii, we discovered a new transient source, most likely a supernova, in the galaxy VV 839.

ASASSN-15uy was discovered in images obtained on UT 2015-12-31.63 at V~16.6 mag. We also detect the object in images obtained on UT 2015-12-23.63 (V~17.2). We do not detect (V>17.8) the object in images taken on UT 2015-12-13.65 and before. An image obtained on 2016-01-01 by E. Conseil confirms the discovery of the transient. This figure shows the archival SDSS g-band image of the host (left) and the E. Conseil confirmation image (right). The red circle has a radius of 10" and is centered on the position of the transient in the E. Conseil's image.

The position of ASASSN-15uy is approximately 4.4" from the center of the galaxy VV 839 (z=0.016014, d=68 Mpc, via NED), giving an absolute V-band magnitude of approximately -17.6 (m-M=34.18, A_V=0.05). 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-15uy  14:32:15.31   +26:19:32.02      2015-12-31.63      16.6          -17.6                4.4 
Obs. UT Date         V mag 
2015-12-13.65        >17.8 
2015-12-23.63         17.2 
2015-12-31.63         16.6 

Follow-up observations are encouraged.

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.