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ASAS-SN Discovery of A Possible Supernova in NGC 1566

ATel #6460; S. Kiyota (Variable Star Observers League in Japan), T. W.-S. Holoien, K. Z. Stanek, B. J. Shappee, A. B. Davis, C. S. Kochanek, U. Basu, J. F. Beacom (Ohio State), J. L. Prieto (Diego Portales, MAS), D. Bersier (LJMU), J. Brimacombe (Coral Towers Observatory), D. Szczygiel, G. Pojmanski (Warsaw University Observatory), E. Conseil (Association Francaise des Observateurs d'Etoiles Variables), I. Cruz (Cruz Observatory), L. A.G. Monard (Klein Karoo Observatory), J. Nicolas (Groupe SNAUDE, France), B. Nicholls (Mt. Vernon Obs., New Zealand)
on 11 Sep 2014; 15:35 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 #: 6461, 6466, 6480

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 NGC 1566:

Object       RA (J2000)     DEC (J2000)      Disc. UT Date   Disc. V mag 
ASASSN-14ha  04:20:01.41    -54:56:17.0      2014-09-10.29    14.6 

ASASSN-14ha was discovered in images obtained on UT 2014-09-10.29 at V~14.6 mag. We also detect the object in images obtained on UT 2014-09-11.40 (V~14.9), but we do not detect (V>16.0) the object in images taken on UT 2014-09-08.33 and before. An image obtained by S. Kiyota on UT 2014-09-11.56 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 SINGS V-band image of the host (left) and the S. Kiyota confirmation image (right). The red arrow indicates the position of the transient.

The position of ASASSN-14ha in the S. Kiyota image is approximately 1.0" South and 8.7" East from the center of the galaxy NGC 1566 (z=0.005017, d=20.5 Mpc, via NED), giving an absolute V-band magnitude at discovery of approximately -17.0 (m-M=31.56, A_V=0.025). 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.