ASASSN-16gy: Discovery of A Probable Supernova in UGC 01814

ATel #9217; G. Masi (Virtual Telescope Project, Ceccano, Italy), 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), G. Bock (Runaway Bay Observatory, Australia), R. S. Post (Post Astronomy), G. Stone (Sierra Remote Observatories)
on 7 Jul 2016; 01:45 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Jonathan Brown (brown@astronomy.ohio-state.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 UGC 01814 NOTES02.

ASASSN-16gy (AT 2016cyx) was discovered in images obtained on UT 2016-07-06.59 at V~16.1 mag. We do not detect (V>17.0) the object in images taken on UT 2016-06-24.60 and before. An image obtained on 2016-07-06 by G. Masi confirms the discovery of the transient. This figure shows the archival DSS image of the host (left) and the G. Masi confirmation image (right). The red circle has a radius of 5" and is centered on the position of the transient in the G. Masi image.

The position of ASASSN-16gy is approximately 5.0" South and 13.5" West from the center of the galaxy UGC 01814 (z=0.013689, d=53.2 Mpc, via NED), giving an absolute V-band magnitude of approximately -17.9 (m-M=33.60, A_V=0.401). 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-16gy  02:21:22.767   +16:33:54.56     2016-07-06.59      16.1          -17.9               2.75 

 
Obs. UT Date         V mag 
2016-06-24.60        >17.0 
2016-07-06.59         16.1 

Follow-up observations are encouraged.

While we are participating in the TNS system to minimize potential confusion, ASAS-SN will continue using ASASSN-16xx transient names as our primary nomenclature (including supernovae, but also other classes of transients), and we encourage others to do the same. We prefer merging the names as ASASSN-16xx (AT2016xyz) to preserve, rather than anonymize, the origin of the transient.

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.