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ASAS-SN Discovery of A Probable Supernova in SDSS J144816.71+171235.6

ATel #8461; 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), Subo Dong, Ping Chen (KIAA-PKU), J. Brimacombe (Coral Towers Observatory)
on 24 Dec 2015; 06:07 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Jonathan Brown (brown@astronomy.ohio-state.edu)

Subjects: Optical, Supernovae, Transient

Referred to by ATel #: 8467

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 SDSS J144816.71+171235.6.

ASASSN-15uk was discovered in images obtained on UT 2015-12-23.65 at V~16.7 mag. We also detect the object in images obtained on UT 2015-12-17.65 (V~17.0), UT 2015-12-13.66 (V~16.7), and UT 2015-12-12.66 (V~16.8). We do not detect (V>17.3) the object in images taken on UT 2015-08-17.24 and before. This figure shows the archival SDSS 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 5" and is centered on the position of the transient in the subtraction image.

The position of ASASSN-15uk is approximately 0.91" North and 0.57" West from the center of the galaxy SDSS J144816.71+171235.6 (no redshift information available from NED). 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-15uk  14:48:16.675  +17:12:36.60      2015-12-23.65      16.7            N/A               1.07 
Obs. UT Date         V mag 
2015-08-17.24        >17.3 
2015-12-12.66         16.8 
2015-12-13.66         16.7  
2015-12-17.65         17.0 
2015-12-23.65         16.7 

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 Mt. Cuba Astronomical Foundation, the Center for Cosmology and AstroParticle Physics (CCAPP) at OSU, 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.