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ASAS-SN Discovery of A Probable Supernova in ESO 467-G051

ATel #6592; J. Brimacombe (Coral Towers Observatory), S. Kiyota (Variable Star Observers League in Japan), T. W.-S. Holoien, K. Z. Stanek, C. S. Kochanek, A. B. Davis, G. Simonian, U. Basu, J. F. Beacom (Ohio State), B. J. Shappee (Hubble Fellow, Carnegie Observatories), J. L. Prieto (Diego Portales; MAS), D. Bersier (LJMU), D. Szczygiel, G. Pojmanski (Warsaw University Observatory), E. Conseil (Association Francaise des Observateurs d'Etoiles Variables), I. Cruz (Cruz Observatory), J. Hissong (Columbus Astronomical Society), L. A.G. Monard (Klein Karoo Observatory), B. Nicholls (Mt. Vernon Obs., New Zealand), J. Nicolas (Groupe SNAUDE, France), W. Wiethoff (University of Minnesota, Duluth)
on 19 Oct 2014; 14:18 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 467-G051:

Object       RA (J2000)     DEC (J2000)      Disc. UT Date   Disc. V mag 
ASASSN-14jb  22:23:16.12   -28:58:30.78      2014-10-19.09    16.9 

ASASSN-14jb was discovered in images obtained on UT 2014-10-19.09 at V~16.9 mag. We do not detect (V>17.5) the object in images taken on UT 2014-10-13.010 and before. Images obtained by J. Brimacombe on UT 2014-10-19.39 with a 33-cm RCOS + STL-6303 CCD at Savannah Skies Observatory and by S. Kiyota on UT 2014-10-19.45 using a 0.7m f/6.6CDK + FLI PL-9000 CCD at the ITelescope.NET site at Siding Springs Observatory confirm 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-14jb is approximately 20.7" North and 6.5" West from the center of the galaxy ESO 467-G051 (z=0.006031, d=20.8 Mpc, via NED), giving an absolute V-band magnitude of approximately -14.7 (m-M=31.59, A_V=0.051). We note that the adjacent galaxy NGC 7259 is the host of well-studied SN 2009ip (e.g., Brimacombe 2012; Prieto, Brimacombe et al. 2013), so there is a wealth of archival data to study past behavior at the ASASSN-14jb site. Follow-up observations are encouraged.

We thank LCOGT and its staff for their continued support of ASAS-SN. For more information about the ASAS-SN project, see the ASAS-SN Homepage and the list of all ASAS-SN transients.