ASASSN-16ad: ASAS-SN Discovery of A Probable Supernova in KUG 0136+335

ATel #8521; Subo Dong (KIAA-PKU), J. Brimacombe (Coral Towers Observatory), K. Z. Stanek, J. S. Brown, 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)
on 9 Jan 2016; 14:14 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 "Brutus" telescope in Haleakala, Hawaii, we discovered a new transient source, most likely a supernova, in the galaxy KUG 0136+335.

ASASSN-16ad (AT 2016F) was discovered in images obtained on UT 2016-01-09.28 at V~16.2 mag. We also detect the object in images taken on UT 2016-01-07.30 (V~16.8) and 2016-01-04.30 (V~17.6). We do not detect (V>18.0) the object in images taken on UT 2016-01-01.23 and before. This figure shows the archival SDSS g-band image of the host (left), the ASAS-SN reference image (middle) and the subtracted image on UT 2016-01-09 (right). The red circle has a radius of 20" and is centered on the position of the transient in the LCOGT image.

The position of ASASSN-16ad is approximately 14" from the center of the galaxy KUG 0136+335 (z=0.016138, d=63 Mpc, via NED), giving an absolute V-band magnitude of approximately -17.9 (m-M=33.98, A_V=0.134). Properties of the new source and photometry are summarized in the tables below:

 
Object       RA (J2000)   DEC (J2000)    Disc. UT Date   Disc. Vmag  Abs. Mag   Offset from Host (") 
ASASSN-16ad  01:39:32.03  +33:49:36.05   2016-01-09.28      16.2        -17.9          14 

 
Obs. UT Date         V mag 
2016-01-01.23        >18.0 
2016-01-04.30         17.6 
2016-01-07.30         16.8 
2016-01-09.28         16.2 

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.