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ASAS-SN Discovery of A Probable Supernova in SDSS J133454.38+105905.6

ATel #8408; G. Masi (Virtual Telescope Project, Ceccano, Italy), J. Brimacombe (Coral Towers Observatory), J. S. Brown, T. W.-S. Holoien, K. Z. Stanek, 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), G. Bock (Runaway Bay Observatory, Australia), I. Cruz (Cruz Observatory), S. Kiyota (Variable Star Observers League in Japan), G. Krannich (Roof Observatory Kaufering), B. Nicholls (Mt. Vernon Obs., New Zealand), W. Wiethoff (University of Minnesota, Duluth)
on 14 Dec 2015; 18:43 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Jonathan Brown (brown@astronomy.ohio-state.edu)

Subjects: Optical, Supernovae, Transient

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 J133454.38+105905.6.

ASASSN-15ua was discovered in images obtained on UT 2015-12-12.63 at V~16.9 mag. We also detect the object in images obtained on UT 2015-12-09.62 (V~17.5). We do not detect (V>17.1) the object in images taken on UT 2015-11-30.64 and before. An image obtained on 2015-12-14 by J. Brimacombe confirms the discovery of the transient. This figure shows the archival SDSS g-band image of the host (left) and the J. Brimacombe confirmation image (right). The red circle has a radius of 5" and is centered on the position of the transient in the J. Brimacombe image.

The position of ASASSN-15ua is approximately 0.95" South and 1.40" East from the center of the galaxy SDSS J133454.38+105905.6 (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-15ua  13:34:54.473  +10:59:04.69      2015-12-12.63      16.9             N/A                1.7 
 
Obs. UT Date         V mag 
2015-11-30.64        >17.1 
2015-12-09.62         17.5 
2015-12-12.63         16.9 

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.