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ASAS-SN Discovery of A Probable Supernova in ESO 319-G15

ATel #6297; T. W.-S. Holoien, K. Z. Stanek, B. J. Shappee, A. B. Davis, C. S. Kochanek, J. Jencson, U. Basu, J. F. Beacom (Ohio State), J. L. Prieto (Princeton/Diego Portales), D. Bersier (LJMU), J. Brimacombe (Coral Towers Observatory), D. Szczygiel, G. Pojmanski (Warsaw University Observatory)
on 7 Jul 2014; 16:17 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 #: 6302

During the ongoing All Sky Automated Survey for SuperNovae (ASAS-SN or "Assassin"), using data from the recently commissioned double 14-cm "Cassius" telescope in Cerro Tololo, Chile, we discovered a new transient source, most likely a supernova, in the galaxy ESO 319-G15:

Object       RA (J2000)     DEC (J2000)      Disc. UT Date   Disc. V mag 
ASASSN-14dp  11:21:58.45    -37:54:24.5      2014-07-07.06      16.2 

ASASSN-14dp was discovered in multiple images obtained 2014 UT July 07.06 at V~16.2 mag. We do not detect (V>17.4) the object in images taken on 2014 UT June 30.98 and before. This figure shows the two ASAS-SN V-band discovery images (top-left and top-right), the ASAS-SN V-band reference image (bottom-left), and the archival DSS image of the host (bottom-right). The red circle has a radius of 7" and is centered on the ASAS-SN position of the transient.

The ASAS-SN position of ASASSN-14dp is approximately 27" South and 6" East from the center of the dwarf galaxy ESO 319-G15 (z=0.009159, d=42.3 Mpc, via NED), giving an absolute V-band magnitude of approximately -17.3 (m-M=33.13, A_V=0.332, Schlafly & Finkbeiner 2011). We also note that the position of ASASSN-14dp is roughly 9.8' from the recently discovered supernova PSN J11220840-3804001 in the galaxy ESO 319-G16 (z=0.009580, via NED). 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.