ASASSN-16gf: Discovery of A Supernova in CGCG 104-069
ATel #9146; M. Fausnaugh, P. Garnavich, J. Zinn, J. S. Brown, K. Z. Stanek, T. W.-S. Holoien, C. S. Kochanek, 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, Ping Chen (KIAA-PKU), J. Brimacombe (Coral Towers Observatory)
on 13 Jun 2016; 20:01 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 supernova in the galaxy CGCG 104-069.
ASASSN-16gf (AT 2016cvl) was discovered in images obtained on UT 2016-06-05.45 at V~17.5 mag. We also detect the object in images taken on UT 2016-05-30.36 (V~17.5) and UT 2016-05-29.42 (V~17.4). We do not detect (V>17.8) the object in images taken on UT 2016-05-24.31 and before. Follow-up observations on 2016-06-13 with MODS1+2 on the LBT confirm the discovery of the supernova. This figure shows the archival SDSS g-band image of the host (left) and the MODS1 acquisition image (right). The red circle has a radius of 5" and is centered on the position of the transient in the MODS1 acquisition image.
The position of ASASSN-16gf is approximately 0.4" South and 1.4" West from the center of the galaxy CGCG 104-069 (z=0.030608, d=132 Mpc, via NED), giving an absolute V-band magnitude of approximately -18.1 (m-M=35.53, A_V=0.097). The spectra obtained with MODS1+2 show the transient to be a subluminous Type Ia supernova after maximum. 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-16gf 14:41:46.597 +19:15:06.66 2016-06-05.45 17.5 -18.1 1.46
Obs. UT Date V mag
2016-05-24.31 >17.4
2016-05-29.42 17.4
2016-05-30.36 17.5
2016-06-05.45 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.
