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.
