[ Previous | Next | ADS ]

ASAS-SN Discovery of A Probable Supernova in 2MASX J14103977-0241003

ATel #6803; 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. Gross, 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), J. Nicolas (Groupe SNAUDE, France)
on 11 Dec 2014; 18:38 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 #: 6812

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 J14103977-0241003:

Object       RA (J2000)     DEC (J2000)      Disc. UT Date   Disc. V mag 
ASASSN-14lu  14:10:39.52    -02:40:56.0      2014-12-09.65    16.4 

ASASSN-14lu was discovered in images obtained on UT 2014-12-09.65 at V~16.4 mag. We do not detect (V>16.2) the object in images taken on UT 2014-12-06.65 and before. Images obtained by J. Brimacombe on UT 2014-12-11.47 with the RCOS 51-cm telescope in New Mexico and by S. Kiyota on UT 2014-12-11.53 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 J. Brimacombe confirmation image (right). The red arrow indicates the position of the transient in the J. Brimacombe image.

The position of ASASSN-14lu is approximately 4.7" North and 3.4" West from the center of the galaxy 2MASX J14103977-0241003 (z=0.026995, d=117 Mpc, via NED), giving an absolute V-band magnitude of approximately -19.1 (m-M=35.34, A_V=0.178). 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.