ASAS-SN Discovery of A Probable Supernova in PGC 068459
ATel #7621; T. W.-S. Holoien, K. Z. Stanek, C. S. Kochanek, J. S. Brown, A. B. Danilet, G. Simonian, U. Basu, J. F. Beacom, T. A. Thompson (Ohio State), B. J. Shappee (Hubble Fellow, Carnegie Observatories), J. L. Prieto (Diego Portales; MAS), D. Bersier (LJMU), Subo Dong (KIAA-PKU), J. Brimacombe (Coral Towers Observatory), E. Falco (CfA), P. R. Wozniak (LANL), D. Szczygiel, G. Pojmanski (Warsaw University Observatory)
on 11 Jun 2015; 16:31 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Thomas Holoien (firstname.lastname@example.org)
Subjects: Optical, Supernovae, Transient
Referred to by ATel #: 7623
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 PGC 068459.
ASASSN-15kx was discovered in images obtained on UT 2015-06-10.57 at V~16.6 mag. We also detect the object in images obtained on UT 2015-06-11.410 (V~16.3). We do not detect (V>17.0) the object in images taken on UT 2015-06-07.57 and before. An image obtained on UT 2015-06-11.60 with the LCOGT 1-m robotic telescope at McDonald Observatory confirms the discovery of the transient. This figure shows the archival DSS image of the host (left) and the LCOGT g-band confirmation image (right). The red circle has a radius of 3" and is centered on the position of the transient in the LCOGT image.
The position of ASASSN-15kx is approximately 2.0" South and 1.2" West from the center of the galaxy PGC 068459 (z=0.018019, d=70.7 Mpc, via NED), giving an absolute V-band magnitude of approximately -18.1 (m-M=34.25, A_V=0.450). 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-15kx 22:16:11.81 +37:28:26.12 2015-06-10.57 16.6 -18.1 2.33
Obs. UT Date V mag
Follow-up observations are encouraged.
We thank LCOGT and its staff for their continued support of ASAS-SN. ASAS-SN is supported in part by 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.