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ASAS-SN Discovery of A Probable Supernova in 2MASX J14423254-1327294

ATel #7385; J. Brimacombe (Coral Towers Observatory), T. W.-S. Holoien, K. Z. Stanek, C. S. Kochanek, A. B. Danilet, G. Simonian, U. Basu, N. Goss, 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), P. R. Wozniak (LANL), E. Falco (CfA), D. Szczygiel, G. Pojmanski (Warsaw University Observatory), J. G. Carballo (Observatorio Cerro del Viento MPC 184), S. Kiyota (Variable Star Observers League in Japan), R. A. Koff (Antelope Hills Observatory), G. Krannich (Roof Observatory Kaufering), L. A.G. Monard (Klein Karoo Observatory), W. Wiethoff (University of Minnesota, Duluth)
on 13 Apr 2015; 18:33 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Thomas Holoien (tholoien@astronomy.ohio-state.edu)

Subjects: Optical, Supernovae, Transient

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 2MASX J14423254-1327294:

Object       RA (J2000)     DEC (J2000)      Disc. UT Date   Disc. V mag 
ASASSN-15gz  14:42:32.14   -13:27:36.63      2015-04-13.31    17.0 

ASASSN-15gz was discovered in images obtained on UT 2015-04-13.31 at V~17.0 mag. We also detect the object in images obtained on UT 2015-04-12.32 (V~17.3). We do not detect (V>17.4) the object in images taken on UT 2015-04-10.39 and before. An image obtained by J. Brimacombe on UT 2015-04-13.62 with the CDK 43-cm telescope at Savannah Skies Observatory 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-15gz is approximately 7.0" South and 6.7" West from the center of the galaxy 2MASX J14423254-1327294 (z=0.034027, d=147 Mpc, via NED), giving an absolute V-band magnitude of approximately -19.1 (m-M=35.83, A_V=0.258). 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.