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ASAS-SN Discovery of A Probable Supernova in 2MASX J03051061+3754003

ATel #8351; 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), I. Cruz (Cruz Observatory), S. Kiyota (Variable Star Observers League in Japan)
on 2 Dec 2015; 04:12 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 #: 8356

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 2MASX J03051061+3754003.

ASASSN-15ti was discovered in images obtained on UT 2015-12-01.38 at V~16.6 mag. We also detect the object in images obtained on UT 2015-11-30.46 (V~16.9). We do not detect (V>16.3) the object in images taken on UT 2015-11-28.43 and before. This figure shows the archival SDSS g-band 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-15ti is approximately 0.7" North and 29.9" West from the center of the galaxy 2MASX J03051061+3754003 (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-15ti  03:05:08.616  +37:54:00.72      2015-12-01.38      16.6          N/A                29.91 
Obs. UT Date         V mag 
2015-11-28.43        >16.3 
2015-11-30.46         16.9 
2015-12-01.38         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 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.