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ASASSN-16bp: Discovery of A Probable Supernova in CGCG 336-041

ATel #8666; I. Cruz (Cruz Observatory), J. Brimacombe (Coral Towers Observatory), 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), G. Bock (Runaway Bay Observatory, Australia), S. Kiyota (Variable Star Observers League in Japan), G. Masi (Virtual Telescope Project, Ceccano, Italy)
on 10 Feb 2016; 17:06 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 #: 8672

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 CGCG 336-041.

ASASSN-16bp (AT 2016adq) was discovered in images obtained on UT 2016-02-09.61 at V~16.7 mag. We also detect the object in images obtained on UT 2016-01-28.59 (V~16.7). We do not detect (V>16.25) the object in images taken on UT 2016-01-26.59 and before. An image obtained on 2016-02-09 by I. Cruz confirms the discovery of the transient. This figure shows the archival DSS image of the host (left) and the I. Cruz confirmation image (right). The red circle has a radius of 5" and is centered on the position of the transient in the I. Cruz image.

The position of ASASSN-16bp is approximately 3.3" South and 11.5" West from the center of the galaxy CGCG 336-041 (z=0.034194, d=145 Mpc, via NED), giving an absolute V-band magnitude of approximately -19.1 (m-M=35.73, A_V=0.056). 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-16bp  14:06:44.367  +71:53:15.24      2016-02-09.61      16.7          -19.1               11.96 
Obs. UT Date         V mag 
2016-01-26.59        >16.25 
2016-01-28.59         16.7 
2016-02-09.61         16.7 

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 (AT2016yy) 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.