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ASAS-SN Discovery of A Probable Supernova in 2MASX J04061478-0853112

ATel #6943; J. Brimacombe (Coral Towers Observatory), S. Kiyota (Variable Star Observers League in Japan), B. Nicholls (Mt. Vernon Obs., New Zealand), T. W.-S. Holoien, K. Z. Stanek, C. S. Kochanek, A. B. Danilet, 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)
on 17 Jan 2015; 17:52 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 #: 6949

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 2MASX J04061478-0853112:

 
Object       RA (J2000)     DEC (J2000)      Disc. UT Date   Disc. V mag 
ASASSN-15bc  04:06:14.64   -08:53:08.28      2015-01-16.31    16.9 

ASASSN-15bc was discovered in images obtained on UT 2015-01-16.31 at V~16.9 mag. We do not detect (V>17.2) the object in images taken on UT 2015-01-14.32 and before. Images obtained by J. Brimacombe on UT 2015-01-17.08 with the RCOS 51-cm telescope in New Mexico, by S. Kiyota on UT 2015-01-17.20 using a Planewave CDK 0.61-m telescope located at Sierra Remote Observatory, and by B. Nicholls on UT 2015-01-17.53 using the 30-cm telescope at Mt. Vernon Observatory, confirm the discovery of the transient. This figure shows the archival DSS 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-15bc is approximately 2.9" North and 2.2" West from the center of the galaxy 2MASX J04061478-0853112 (z=0.036715, d=154 Mpc, via NED), giving an absolute V-band magnitude of approximately -19.1 (m-M=35.93, A_V=0.119). Follow-up observations are encouraged.

We thank LCOGT and its staff for their continued support of ASAS-SN. ASAS-SN is supported in part by Mt. Cuba Astronomical Foundation. For more information about the ASAS-SN project, see the ASAS-SN Homepage and the list of all ASAS-SN transients.