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ASAS-SN Discovery of A Probable Supernova in KUG 0923+457

ATel #6856; 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, N. Goss, J. F. Beacom (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), D. Szczygiel, G. Pojmanski (Warsaw University Observatory), E. Conseil (Association Francaise des Observateurs d'Etoiles Variables), R. A. Koff (Antelope Hills Observatory), J. Nicolas (Groupe SNAUDE, France)
on 29 Dec 2014; 21:21 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 #: 6872

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 KUG 0923+457:

 
Object       RA (J2000)     DEC (J2000)      Disc. UT Date   Disc. V mag 
ASASSN-14mu  09:26:17.25   +45:29:25.20      2014-12-29.39    16.5 

ASASSN-14mu was discovered in images obtained on UT 2014-12-29.39 at V~16.5 mag. We also detect the object in images obtained on UT 2014-12-27.49 (V~16.8), UT 2014-12-24.41 (V~17.1), and UT 2014-12-19.51 (V~17.2). We do not detect (V>17.4) the object in images taken on UT 2014-12-15.51 and before. Images obtained by J. Brimacombe on UT 2014-12-29.48 with the RCOS 51-cm telescope in New Mexico and by S. Kiyota on UT 2014-12-29.51 using a Planewave CDK 0.43-m telescope located near Mayhill, New Mexico confirm the discovery of the transient. This figure shows the archival SDSS g-band image of the host (left) and the S. Kiyota confirmation image (right). The red arrow indicates the position of the transient in the S. Kiyota image.

The position of ASASSN-14mu is approximately 0.3" North and 1.3" West from the coordinates of the galaxy KUG 0923+457 (z=0.027249, d=117 Mpc, via NED), giving an absolute V-band magnitude of approximately -18.9 (m-M=35.34, A_V=0.048). 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.