ASASSN-16fc, ASASSN-16fd, and ASASSN-16fe: Discovery of Three Probable Supernovae
ATel #9057; J. Brimacombe (Coral Towers Observatory), L. A.G. Monard (Klein Karoo Observatory), S. Kiyota (Variable Star Observers League in Japan), J. S. Brown, T. W.-S. Holoien, K. Z. Stanek, 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), R. A. Koff (Antelope Hills Observatory)
on 16 May 2016; 17:57 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 and the quadruple 14-cm "Cassius" telescope in Cerro Tololo, Chile, we discovered three new transient sources, most likely supernovae, in the galaxies SDSS J153151.40+372445.8, 2MASX J22212881-2215454, and APMUKS(BJ) B225823.09-373218.0. In each figure, we show the archival image of the host (left), and the confirmation image (right). The red circle has a radius of 5" and is centered on the position of the transient.
ASASSN-16fc (AT 2016cda) was discovered in images obtained on UT 2016-05-15.35 at V~17.6 mag. An image obtained on 2016-05-16 by J. Brimacombe confirms the discovery of the transient.
The position of ASASSN-16fc is approximately 2.0" North and 2.0" West from the center of the galaxy SDSS J153151.40+372445.8 (z=0.029997, d=127 Mpc, via NED), giving an absolute V-band magnitude of approximately -17.9 (m-M=35.46, A_V=0.046).
ASASSN-16fd (AT 2016cdb) was discovered in images obtained on UT 2016-05-15.38 at V~16.3 mag. An image obtained on 2016-05-16 by J. Brimacombe confirms the discovery of the transient.
The position of ASASSN-16fd is approximately 0.2" South and 7.3" East from the center of the galaxy 2MASX J22212881-2215454 (z=0.023906, d=95.6 Mpc, via NED), giving an absolute V-band magnitude of approximately -18.6 (m-M=34.85, A_V=0.087).
ASASSN-16fe (AT 2016cdc) was discovered in images obtained on UT 2016-05-15.35 at V~17.0 mag. An image obtained on 2016-05-16 by B. Monard confirms the discovery of the transient.
The position of ASASSN-16fe is approximately 1.0" South and 15.0" East from the center of the galaxy APMUKS(BJ) B225823.09-373218.0 (no redshift information available from NED). Properties of the new sources 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-16fc 15:31:51.242 +37:24:47.87 2016-05-15.35 17.6 -17.9 2.87
ASASSN-16fd 22:21:29.325 -22:15:46.05 2016-05-15.38 16.3 -18.6 7.33
ASASSN-16fe 23:01:11.439 -37:16:08.97 2016-05-15.35 17.0 N/A 15.03
ASASSN-16fc photometry:
Obs. UT Date V mag
2016-05-06.37 >18.6
2016-05-15.35 17.6
ASASSN-16fd photometry:
Obs. UT Date V mag
2016-04-08.42 >15.6
2016-05-15.38 16.3
ASASSN-16fe photometry:
Obs. UT Date V mag
2016-01-02.04 >17.5
2016-05-15.35 17.0
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.