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ASAS-SN Discovery of A Probable Supernova in 2MASX J00453260-1415328

ATel #6525; J. Brimacombe (Coral Towers Observatory), 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), D. Szczygiel, G. Pojmanski (Warsaw University Observatory), E. Conseil (Association Francaise des Observateurs d'Etoiles Variables), I. Cruz (Cruz Observatory), J. Hissong (Columbus Astronomical Society), S. Kiyota (Variable Star Observers League in Japan), L. A.G. Monard (Klein Karoo Observatory), B. Nicholls (Mt. Vernon Obs., New Zealand), J. Nicolas (Groupe SNAUDE, France), W. Wiethoff (University of Minnesota, Duluth
on 2 Oct 2014; 18:36 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 #: 6536

During the ongoing All Sky Automated Survey for SuperNovae (ASAS-SN or "Assassin"), using data from the double 14-cm "Cassius" telescope in Cerro Tololo, Chile, we discovered a new transient source, most likely a supernova, in the galaxy 2MASX J00453260-1415328:

Object       RA (J2000)     DEC (J2000)      Disc. UT Date   Disc. V mag 
ASASSN-14il  00:45:32.55    -14:15:34.6      2014-10-01.11    16.5 

ASASSN-14il was discovered in images obtained on UT 2014-10-01.11 at V~16.5 mag. We also detect the object in images obtained with multiple ASAS-SN cameras on UT 2014-10-02.42 (V~16.2) and UT 2014-10-02.17 (V~16.2). We do not detect (V>17.3) the object in images taken on UT 2014-09-27.04 and before. An image obtained by J. Brimacombe on UT 2014-10-02.22 with the RCOS 41-cm telescope near Siding Spring Observatory confirms the discovery of the transient. This figure shows the archival DSS image of the host (left) and the J. Brimacombe confirmation image (right). The red circle has a radius of 1.0" and is centered on the position of the transient in the confirmation image.

The position of ASASSN-14il is approximately 0.33" North and 0.26" West from the center of the galaxy 2MASX J00453260-1415328 (z=0.021989, d=87.4 Mpc, via NED), giving an absolute V-band magnitude of approximately -18.3 (m-M=34.71, A_V=0.061). 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.