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ASAS-SN Discovery of A Probable Supernova in ESO 366-G015

ATel #7360; S. Kiyota (Variable Star Observers League in Japan), T. W.-S. Holoien (Ohio State), J. L. Prieto (Diego Portales; MAS), 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), D. Bersier (LJMU), Subo Dong (KIAA-PKU), P. R. Wozniak (LANL), E. Falco (CfA), J. Brimacombe (Coral Towers Observatory), D. Szczygiel, G. Pojmanski (Warsaw University Observatory), J. G. Carballo (Observatorio Cerro del Viento MPC I84), R. A. Koff (Antelope Hills Observatory), L. A.G. Monard (Klein Karoo Observatory), W. Wiethoff (University of Minnesota, Duluth)
on 9 Apr 2015; 15:51 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 ESO 366-G015:

Object       RA (J2000)     DEC (J2000)      Disc. UT Date   Disc. V mag 
ASASSN-15gr  06:45:20.58   -34:53:38.11      2015-04-09.05    16.4 

ASASSN-15gr was discovered in images obtained on UT 2015-04-09.05 at V~16.4 mag. We do not detect (V>16.4) the object in images taken on UT 2015-04-05.010 and before. An image obtained by S. Kiyota on UT 2014-04-09.36 using a 0.5m CDK + FLI PL-9000 at the ITelescope.NET site at Siding Springs Observatory confirms the discovery of the transient. This figure shows the archival DSS image of the host (left) and the S. Kiyota confirmation image (right). The red circle has a radius of 3.5" and is centered on the position of the transient in the S. Kiyota image.

The position of ASASSN-15gr is approximately 14.8" South and 11.8" West from the center of the galaxy ESO 366-G015, which, while clearly a galaxy in DSS images, does not have an available redshift in NED. Follow-up observations, particularly spectroscopy, 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.