ASAS-SN Discovery of A Probable Supernova in An Unknown Redshift Galaxy GALEXASC J011659.34-045630.6
ATel #8471; K. Z. Stanek, J. S. Brown, 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 29 Dec 2015; 19:22 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 "Cassius" telescope
in Cerro Tololo, Chile, we discovered a new transient source, most
likely a supernova, in the galaxy GALEXASC J011659.34-045630.6.
ASASSN-15uo was discovered in images obtained on UT 2015-12-29.06 at
V~16.7 mag, and we also detect the object in images taken on
2015-12-27.07 (V~16.8). We do not detect (V>16.7) the object in
bright-Moon images taken on UT 2015-12-25.09 and before. This
figure shows the archival DSS image of the host (left), the
ASAS-SN V-band reference image (middle), and the ASAS-SN subtraction
image (right) that was used to discover the supernova candidate. The
red circle has a radius of 5" and is centered on the position of the
transient in the subtraction image.
The position of ASASSN-15uo is approximately 12"
from the center of the galaxy GALEXASC
J011659.34-045630.6 (no redshift information available from NED,
foreground reddening A_V=0.12). 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-15uo 01:17:00.00 -04:56:34.1 2015-12-29.06 16.7 N/A 12
Obs. UT Date V mag
2015-12-25.09 >16.6
2015-12-27.07 16.8
2015-12-29.06 16.7
Follow-up observations are encouraged.
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, 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.