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ASASSN-16jh: Discovery of A Probable Supernova in 2dFGRS S501Z101

ATel #9407; Ping Chen, Subo Dong (KIAA-PKU), K. Z. Stanek, J. S. Brown, T. W.-S. Holoien, C. S. Kochanek, J. Shields, U. Basu (Ohio State), B. J. Shappee (Hubble Fellow, Carnegie Observatories), J. L. Prieto (Diego Portales; MAS), D. Bersier (LJMU), S. Bose (KIAA-PKU), J. Brimacombe (Coral Towers Observatory)
on 25 Aug 2016; 11:51 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Subo Dong (dongsubo@pku.edu.cn)

Subjects: Optical, Supernovae

Referred to by ATel #: 9461

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 PGC199416.

ASASSN-16jh (AT 2016fij) was discovered in images obtained on UT 2016-08-25.25 at V~16.8 mag. We also detect the object in images obtained on UT 2016-08-23.24 (V~16.9), UT 2016-08-21.24 (V~17.3), UT 2016-08-19.20 (V~17.0), UT 2016-08-15.18 (V~17.3). We do not detect (V>18.0) the object in images taken on UT 2016-08-14.41 and before. An image obtained on UT 2016-08-25.38 by the LCOGT 1-m telescope at Cerro Tololo confirms the discovery of the transient. This figure shows the archival DSS image of the host (left) and the LCOGT V-band confirmation image (right). The red circle on the archival image has a radius of 5" and is centered on the position of the transient in the LCOGT image.

The position of ASASSN-16jh is approximately 10.2" from the center of the galaxy 2dFGRS S501Z101 (z=0.0389, d=161 Mpc, via NED), giving an absolute V-band magnitude of approximately -19.3 (m-M=36.03, A_V=0.037). 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-16jh  00:46:56.316   -33:47:35.59     2016-08-25.25      16.8          -19.3               10.2  
Obs. UT Date         V mag  
2016-08-14.41        >18.0  
2016-08-15.18 	      17.3 
2016-08-19.20         17.0 
2016-08-21.24         17.3  
2016-08-23.24         16.9 
2016-08-25.25         16.8   

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.