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ASASSN-16je: Discovery of A Probable Supernova in 2MASX J17055033+6950555

ATel #9395; J. S. Brown, K. Z. Stanek, T. W.-S. Holoien, C. S. Kochanek, J. Shields (Ohio State), B. J. Shappee (Hubble Fellow, Carnegie Observatories), J. L. Prieto (Diego Portales; MAS), D. Bersier (LJMU), Subo Dong, S. Bose, Ping Chen (KIAA-PKU), J. Brimacombe (Coral Towers Observatory)
on 23 Aug 2016; 01:39 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Jonathan Brown (brown@astronomy.ohio-state.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 "Brutus" telescope in Haleakala, Hawaii, we discovered a new transient source, most likely a supernova, in the galaxy 2MASX J17055033+6950555.

ASASSN-16je (AT 2016fez) was discovered in images obtained on UT 2016-08-21.33 at V~16.9 mag. We also detect the object in images obtained on UT 2016-08-06.41 (V~17.1), UT 2016-08-08.39 (V~17.0), UT 2016-08-11.38 (V~17.0), UT 2016-08-17.34 (V~17.1), UT 2016-08-18.25 (V~16.3), UT 2016-08-19.35 (V~16.3), and UT 2016-08-21.33 (V~16.9). We do not detect (V>17.7) the object in images taken on UT 2016-08-03.40 and before. This figure shows the archival DSS image of the host (left) and the ASAS-SN reference image (middle) and the ASAS-SN subtraction image (right). The red circle has a radius of 10" and is centered on the position of the transient in the subtraction image.

The position of ASASSN-16je is approximately 1.5" South and 8.8" West from the center of the galaxy 2MASX J17055033+6950555 (no redshift information available from NED). 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-16je  17:05:48.612   +69:50:53.95     2016-08-21.33      16.9            N/A               8.93 
 
Obs. UT Date         V mag 
2016-08-03.40        >17.7 
2016-08-06.41         17.1 
2016-08-08.39         17.0 
2016-08-11.38         17.0 
2016-08-17.34         17.1 
2016-08-18.25         16.3 
2016-08-19.35         16.3 
2016-08-21.33         16.9 

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, and the Mt. Cuba Astronomical Foundation. For more information about the ASAS-SN project, see the ASAS-SN Homepage and the list of all ASAS-SN transients.