Discovery of A Probable Supernova in KUG 1201+220
ATel #9724; J. Brimacombe (Coral Towers Observatory), R. S. Post (Post Astronomy), S. Kiyota (Variable Star Observers League in Japan), G. Stone (Sierra Remote Observatories), J. Shields, K. Z. Stanek, C. S. Kochanek, J. S. Brown, T. W.-S. Holoien (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), G. Masi (Virtual Telescope Project, Ceccano, Italy)
on 7 Nov 2016; 16:51 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Krzysztof Stanek (stanek.32@osu.edu)
Subjects: Optical, Supernovae
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 KUG 1201+220.
ASASSN-16mz (AT 2016hwn) was discovered in images obtained on UT
2016-11-06.64 at V~17.1 mag. We also detect the object in images
obtained on two other epochs. We do not detect (V>16.8) the object in
images taken on UT 2016-06-20.2 and before. An image obtained on
2016-11-07 by J. Brimacombe confirms the discovery of the
transient. This figure
shows the archival DSS image of the host (left) and the J. Brimacombe
confirmation image (right). The red circle has a radius of 5" and is
centered on the position of the transient in the J. Brimacombe image.
The position of ASASSN-16mz is approximately 9.1" North and 5.8"
East from the center of the galaxy KUG 1201+220 (z=0.021451, d=94.1
Mpc, via NED), giving an absolute V-band magnitude of approximately
-17.8 (m-M=34.87, A_V=0.063). 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-16mz 12:04:16.906 +21:48:03.3 2016-11-06.63 17.1 -17.8 10.8
Obs. UT Date V mag mag_err
2016-06-20.26 >16.83
2016-11-04.64 16.83 0.15
2016-11-06.63 17.08 0.18
2016-11-07.63 16.73 0.13
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.