ASAS-SN Discovery of A Possible Supernova Near 2MASX J22571481-2058014
ATel #6798; J. Nicolas (Groupe SNAUDE, France), T. W.-S. Holoien, K. Z. Stanek, C. S. Kochanek, A. B. Davis, G. Simonian, U. Basu, 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), J. Brimacombe (Coral Towers Observatory), D. Szczygiel, G. Pojmanski (Warsaw University Observatory), E. Conseil (Association Francaise des Observateurs d'Etoiles Variables), S. Kiyota (Variable Star Observers League in Japan)
on 9 Dec 2014; 22:02 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Thomas Holoien (tholoien@astronomy.ohio-state.edu)
Subjects: Optical, Supernovae, Transient
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, possiby a supernova, near the galaxy 2MASX J22571481-2058014:
Object RA (J2000) DEC (J2000) Disc. UT Date Disc. V mag
ASASSN-14lq 22:57:19.41 -20:58:00.8 2014-12-09.23 16.4
ASASSN-14lq was discovered in images obtained on UT 2014-12-09.23 at V~16.4 mag. We also detect the object in images obtained on UT 2014-12-05.05 (V~16.2) and UT 2014-12-01.110 (V~16.3) and marginally detect the object on UT 2014-11-24.22. We do not detect (V>17.5) the object in images taken on UT 2014-11-21.23 and before. An image obtained by J. Nicolas using a 0.41-m telescope at Observatoire Chante-Perdrix-Dauban, France, confirms the discovery of the transient. This figure shows the archival DSS image of the host (left) and the J. Nicolas confirmation image (right). The red circle has a radius of 10" and is centered on the position of the transient in the J. Nicolas image.
The position of ASASSN-14lq is approximately 0.44" North and 23.1" East from the center of the galaxy 2MASX J22571481-2058014 (z=0.026191, d=105 Mpc, via NED), giving an absolute V-band magnitude of approximately -18.8 (m-M=35.11, A_V=0.085) if it is associated with this galaxy. However, given the projected distance from the possible host, a cataclysmic variable star cannot be ruled out. 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.
