ASAS-SN Discovery of A Probable Supernova in LSBG F418-058
ATel #7961; J. Brimacombe (Coral Towers Observatory), J. S. Brown, K. Z. Stanek, T. W.-S. Holoien, C. S. Kochanek, 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), E. Falco (CfA), P. R. Wozniak (LANL), G. Pojmanski (Warsaw University Observatory), B. Nicholls (Mt. Vernon Obs., New Zealand), S. Kiyota (Variable Star Observers League in Japan)
on 27 Aug 2015; 20:14 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Jonathan Brown (firstname.lastname@example.org)
Subjects: Optical, Supernovae, Transient
Referred to by ATel #: 8031
During the ongoing All Sky Automated Survey for SuperNovae (ASAS-SN or "Assassin"), using data from the double 14-cm "Cassius" telescope in Cerro Tololo, Chile, we discovered a new transient source, most likely a supernova, in the galaxy LSBG F418-058.
ASASSN-15ox was discovered in images obtained on UT 2015-08-27.36 at V~17.1 mag. We do not detect (V>17.6) the object in images taken on UT 2015-08-22.27 and before. An image obtained on 2015-08-27 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 3" and is centered on the position of the transient in the J. Brimacombe image.
The position of ASASSN-15ox is approximately 3.95" North and 17.7" West from the center of the low surface brightness galaxy LSBG F418-058 (z=0.046499, d=196 Mpc, via NED), giving an absolute V-band magnitude of approximately -19.4 (m-M=36.46, A_V=0.035). 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-15ox 03:20:39.266 -32:11:54.74 2015-08-27.36 17.1 -19.4 18.14
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 NSF grant AST-1515927 and by 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.