ASASSN-16ie: Discovery of A Probable Supernova in 2MASXi J1604144+164124
ATel #9341; J. S. Brown, K. Z. Stanek, T. W.-S. Holoien, C. S. Kochanek, J. Shields, D. Godoy-Rivera, U. Basu (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 8 Aug 2016; 17:19 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 2MASXi J1604144+164124.
ASASSN-16ie (AT 2016esh) was discovered in images obtained on UT 2016-08-07.32 at V~17.5 mag. We also detect the object in images obtained on UT 2016-08-05.32 (V~17.3) and UT 2016-08-03.33 (V~17.9). We do not detect (V>18.0) the object in images taken on UT 2016-08-01.33 and before. This figure shows the archival SDSS g-band image of the host (left), 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-16ie is approximately 0.5" South and 0.3" West from the center of the galaxy 2MASXi J1604144+164124 (z=0.044520, d=191 Mpc, via NED), giving an absolute V-band magnitude of approximately -18.9 (m-M=36.30, A_V=0.098). 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-16ie 16:04:14.35 +16:41:24.07 2016-08-07.32 17.5 -18.9 0.58
Obs. UT Date V mag
2016-08-01.33 >18.0
2016-08-03.33 17.9
2016-08-05.32 17.3
2016-08-07.32 17.5
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.
