ASAS-SN Discovery of A Probable Supernova in A Dwarf Host GALEXASC J000454.54-322615.3

ATel #6831; B. Nicholls (Mt. Vernon Obs., New Zealand), J. Brimacombe (Coral Towers Observatory), S. Kiyota (Variable Star Observers League in Japan), K. Z. Stanek, T. W.-S. Holoien, 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)
on 16 Dec 2014; 20:27 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Krzysztof Stanek (stanek.32@osu.edu)

Tweet

During the ongoing All Sky Automated Survey for SuperNovae (ASAS-SN or "Assassin"), using data from the double 14-cm "Cassius" telescope in CTIO, Chile, we discovered a new transient, most likely a supernova, towards the galaxy GALEXASC J000454.54-322615.3:

 
Object       RA (J2000)     DEC (J2000)      Disc. UT Date   Disc. V mag  
ASASSN-14mf  0:04:54.459    -32:26:14.63     2014-12-16.05     16.7 

ASASSN-14mf was discovered in images obtained on UT 2014-12-16.052 at V~16.7 mag. We do not detect (V>17.3) this object in images taken on UT 2014-12-12.05 and before. Images obtained by B. Nicholls on UT 2014-12-16.42, with the LCOGT 1-m robotic telescope at Siding Springs on UT 2014-12-16.47, by J. Brimacombe on UT 2014-12-16.56 and by S. Kiyota on UT 2014-12-16.57 confirm the discovery of the transient. This figure shows the archival DSS image of the host (left) and the LCOGT confirmation image (right). The red circle has a radius of 4" and is centered on the position of the transient in the LCOGT image.

The position of ASASSN-14mf is approximately 2.3" from the center of the galaxy GALEXASC J000454.54-322615.3 (z=0.0311, d=127 Mpc, via NED), giving an absolute V-band magnitude of approximately -18.9 (m-M=35.52, A_V=0.05). 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.