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ASAS-SN Discovery of A Probable Supernova in NGC 6319

ATel #7245; R. A. Koff (Antelope Hills 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), J. Brimacombe (Coral Towers Observatory), D. Szczygiel, G. Pojmanski (Warsaw University Observatory), J. G. Carballo (Observatorio Cerro del Viento MPC I84), J. M. Fernandez (Observatory Inmaculada del Molino), S. Kiyota (Variable Star Observers League in Japan), W. Wiethoff (University of Minnesota, Duluth)
on 18 Mar 2015; 17:42 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Thomas Holoien (tholoien@astronomy.ohio-state.edu)

Subjects: Optical, Supernovae, Transient

Referred to by ATel #: 7253

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 NGC 6319:

Object       RA (J2000)     DEC (J2000)      Disc. UT Date   Disc. V mag 
ASASSN-15fa  17:09:46.03   +62:58:27.01      2015-03-17.63    16.2 

ASASSN-15fa was discovered in images obtained on UT 2015-03-17.63 at V~16.2 mag. We also detect the object in images obtained on UT 2015-03-14.64 (V~16.8). We do not detect (V>16.4) the object in images taken on UT 2015-03-02.55 and before. An image obtained by by R. A. Koff on UT 2015-03-18.25 using a Meade LX-200 25-cm telescope located at Antelope Hills Observatory confirms the discovery of the transient. This figure shows the archival DSS image of the host (left) and the R. A. Koff confirmation image (right). The red circle has a radius of 5" and is centered on the position of the transient in the R. A. Koff image.

The position of ASASSN-15fa is approximately 4.0" North and 13.3" East from the center of the galaxy NGC 6319 (z=0.027408, d=114 Mpc, via NED), giving an absolute V-band magnitude of approximately -19.2 (m-M=35.29, A_V=0.075). 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.