ASASSN-16fp: Discovery of A Probable Supernova in UGC 11868

ATel #9086; T. W.-S. Holoien, K. Z. Stanek, J. S. Brown, 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)
on 27 May 2016; 15:37 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Thomas Holoien (tholoien@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 11868.

ASASSN-16fp (AT 2016coi) was discovered in images obtained on UT 2016-05-27.55 at V~15.7 mag. We do not detect (V>16.7) the object in images taken on UT 2016-05-21.54 and before. This figure shows the archival DSS image of the host (left), the ASAS-SN V-band reference image of the host (center), and the 2016-05-27 ASAS-SN V-band subtraction image (right). The red circle has a radius of 10" and is centered on the position of the transient in the ASAS-SN image.

The position of ASASSN-16fp is approximately 31.7" North and 7.9" West from the center of the galaxy UGC 11868 (z=0.003646, d=10.2 Mpc, via NED), giving an absolute V-band magnitude of approximately -14.6 (m-M=30.05, A_V=0.234). 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-16fp  21:59:04.14    +18:11:10.5      2016-05-27.55      15.7          -14.6               32.67 

 
Obs. UT Date         V mag 
2016-05-21.54        >16.7 
2016-05-27.55         15.7 

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 (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.