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ASASSN-16hp: Discovery of A Probable Supernova in ESO 509-IG064

ATel #9268; B. J. Shappee (Hubble Fellow, Carnegie Observatories), T. W.-S. Holoien, K. Z. Stanek, C. S. Kochanek, J. S. Brown, J. Shields, D. Godoy-Rivera, U. Basu (Ohio State), J. L. Prieto (Diego Portales; MAS), D. Bersier (LJMU), Subo Dong, S. Bose, Ping Chen (KIAA-PKU), J. Brimacombe (Coral Towers Observatory)
on 26 Jul 2016; 04:46 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Benjamin Shappee (bshappee@obs.carnegiescience.edu)

Subjects: Optical, Supernovae, Transient

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 new transient source, most likely a supernova, in the galaxy ESO 509-IG064.

ASASSN-16hp (AT 2016eiy) was discovered in images obtained on UT 2016-07-26.08 at V~16.2 mag. We do not detect (V>15.8) the object in images taken on UT 2016-07-24.07 and before. This figure shows the ASAS-SN Discovery subtraction (left), the ASAS-SN reference image (center), and the archival DSS image (right). The red circle has a radius of 3" and is centered on the position of the transient in the ASAS-SN image.

The position of ASASSN-16hp is approximately 6.2" South and 7.7" West from the center of the galaxy ESO 509-IG064 (z=0.008663, d=39.9 Mpc, via NED), giving an absolute V-band magnitude of approximately -17.1 (m-M=33.0, A_V=0.346). 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-16hp  13:34:38.64   -23:40:53.1     2016-07-26.08      16.2          -17.1               9.89 
 
 
Obs. UT Date         V mag 
2016-07-21.05        >16.9 
2016-07-24.07        >15.8 
2016-07-26.08         16.2 

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.