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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

Referred to by ATel #: 9060, 9142

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.