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.