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ASASSN-16fv: Discovery of A Nuclear Transient in IC 4705

ATel #9123; J. Brimacombe (Coral Towers Observatory), B. Nicholls (Mt. Vernon Obs., New Zealand), 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), J. M. Fernandez (Observatory Inmaculada del Molino), G. Masi (Virtual Telescope Project, Ceccano, Italy), W. Wiethoff (University of Minnesota, Duluth)
on 7 Jun 2016; 14:28 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 #: 9142

During the ongoing All Sky Automated Survey for SuperNovae (ASAS-SN or "Assassin"), using data from the quadruple 14-cm "Cassius" telescope in Cerro Tololo, Chile, we discovered a nuclear transient in the galaxy IC 4705.

ASASSN-16fv (AT 2016cqz) was discovered in images obtained on UT 2016-06-06.28 at V~15.6 mag. We also detect the object in images obtained on UT 2016-06-07.26 (V~15.2). We do not detect (V>17.1) the object in images taken on UT 2016-05-28.33 and before. An image obtained on 2016-06-07 by J. Brimacombe 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-16fv is approximately 0.6" South and 0.6" East from the center of the galaxy IC 4705 (z=0.011972, d=49.7 Mpc, via NED), giving an absolute V-band magnitude of approximately -18.1 (m-M=33.46, A_V=0.272). 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-16fv  18:28:10.441   -71:41:38.81     2016-06-06.28      15.6          -18.1               0.85 
 
Obs. UT Date         V mag 
2016-05-28.33        >17.1 
2016-06-06.28         15.6 
2016-06-07.26         15.2 

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.