ASAS-SN Discovery of A Probable Supernova in MCG -01-07-004
ATel #7907; S. Kiyota (Variable Star Observers League in Japan), J. S. Brown (Ohio State), J. L. Prieto (Diego Portales; MAS), C. S. Kochanek, T. W.-S. Holoien, K. Z. Stanek, G. Simonian, U. Basu, J. F. Beacom, T. A. Thompson (Ohio State), B. J. Shappee (Hubble Fellow, Carnegie Observatories), 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), G. Masi (Virtual Telescope Project, Ceccano, Italy)
on 13 Aug 2015; 16:58 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Jonathan Brown (firstname.lastname@example.org)
Subjects: Optical, Supernovae, Transient
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 MCG -01-07-004.
ASASSN-15od was discovered in images obtained on UT 2015-08-10.510 at V~17.4 mag. We also detect the object in images obtained on UT 2015-08-13.53 (V~16.6). We do not detect (V>16.6) the object in images taken on UT 2015-08-09.63 and before. An image obtained on 2015-08-13 by S. Kiyota confirms the discovery of the transient. This figure shows the archival SDSS g-band image of the host (left) and the S. Kiyota confirmation image (right). The red circle has a radius of 3" and is centered on the position of the transient in the S. Kiyota image.
The position of ASASSN-15od is approximately 0.85" South and 0.67" West from the center of the galaxy MCG -01-07-004 (z=0.017989, d=71.5 Mpc, via NED), giving an absolute V-band magnitude of approximately -17.0 (m-M=34.27, A_V=0.081). 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-15od 02:23:13.210 -04:31:02.05 2015-08-10.510 17.4 -17.0 1.08
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.