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ASASSN-16bx: Discovery of A Probable Supernova in CGCG 280-023

ATel #8712; J. Brimacombe (Coral Towers Observatory), T. W.-S. Holoien, K. Z. Stanek, C. S. Kochanek, J. S. Brown, 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), I. Cruz (Cruz Observatory), S. Kiyota (Variable Star Observers League in Japan), G. Masi (Virtual Telescope Project, Ceccano, Italy), B. Nicholls (Mt. Vernon Obs., New Zealand)
on 19 Feb 2016; 16:06 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Thomas Holoien (tholoien@astronomy.ohio-state.edu)

Subjects: Optical, Supernovae, Transient

Referred to by ATel #: 8830

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 280-023.

ASASSN-16bx (AT 2016ajk) was discovered in images obtained on UT 2016-02-18.65 at V~16.9 mag. We also detect the object in images obtained on UT 2016-02-08.67 (V~16.8). We do not detect (V>16.5) the object in images taken on UT 2016-02-06.67 and before. An image obtained by J. Brimacombe on UT 2016-02-19.49 with the RCOS 51-cm telescope in New Mexico confirms the discovery of the transient. This figure shows the archival DSS 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-16bx is approximately 13.5" South and 2.5" West from the center of the galaxy CGCG 280-023 (z=0.026618, d=109 Mpc, via NED), giving an absolute V-band magnitude of approximately -18.6 (m-M=35.20, A_V=0.338). 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-16bx  19:19:26.49    +52:19:41.63      2016-02-18.65      16.9          -18.6               13.73 
Obs. UT Date         V mag 
2016-02-06.67        >16.6 
2016-02-08.67         16.8 
2016-02-18.65         16.9 

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.