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ASAS-SN Discovery of A Probable Supernova in ESO 058-G012

ATel #6505; T. W.-S. Holoien, K. Z. Stanek, C. S. Kochanek, A. B. Davis, U. Basu, J. F. Beacom (Ohio State), B. J. Shappee (Hubble Fellow, Carnegie Observatories), J. L. Prieto (Diego Portales, MAS), D. Bersier (LJMU), J. Brimacombe (Coral Towers Observatory), D. Szczygiel, G. Pojmanski (Warsaw University Observatory)
on 27 Sep 2014; 16:30 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 #: 6510, 6511

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 058-G012:

Object       RA (J2000)     DEC (J2000)      Disc. UT Date   Disc. V mag 
ASASSN-14hu  06:43:26.92    -69:38:14.7      2014-09-27.37     16.0 

ASASSN-14hu was discovered in images obtained on UT 2014-09-27.37 at V~16.0 mag. The object is also detected in images obtained with multiple ASAS-SN cameras on UT 2014-09-27.36 (V~16.1) and UT 2014-09-25.34 (V~16.5). We do not detect (V>17.5) the object in images obtained on UT 2014-09-22.28 and before. This figure shows the ASAS-SN V-band reference image (top-left), the ASAS-SN V-band 2014-09-27 discovery image (top-right), the ASAS-SN 2014-09-27 subtraction image (bottom left), and the archival DSS image of the host (bottom-right). The red circle has a radius of 10" and is centered on the ASAS-SN position of the transient.

The ASAS-SN position of ASASSN-14hu is approximately 15.3" North and 27.8" East from the center of the galaxy ESO 058-G012, an edge-on spiral galaxy of unknown redshift. Follow-up observations, especially spectroscopy, 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.