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ASAS-SN Discovery of A Probable Supernova in Irregular Dwarf Galaxy PGC 043070

ATel #6377; J. M. Fernandez (Pontificia Universidad Catolica), S. Kiyota (Variable Star Observers League in Japan), J. Brimacombe (Coral Towers Observatory), K. Z. Stanek, T. W.-S. Holoien, B. J. Shappee, A. B. Davis, C. S. Kochanek, J. Jencson, U. Basu, J. F. Beacom (Ohio State), J. L. Prieto (Diego Portales), D. Bersier (LJMU), D. Szczygiel, G. Pojmanski (Warsaw University Observatory), E. Conseil (Association Francaise des Observateurs d'Etoiles Variables), I. Cruz (Cruz Observatory), L. A.G. Monard (Klein Karoo Observatory), J. Nicolas (Vallauris, France), W. Wiethoff (University of Minnesota, Duluth)
on 8 Aug 2014; 15:28 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Krzysztof Stanek (stanek.32@osu.edu)

Subjects: Optical, Supernovae

Referred to by ATel #: 6392

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 PGC 043070:

Object       RA (J2000)     DEC (J2000)      Disc. UT Date   Disc. V mag 
ASASSN-14fd  12:46:14.768   -40:48:52.53     2014-08-07.98    16.6 

ASASSN-14fd was discovered in images obtained on UT 2014-08-07.98 at V~16.6 mag. We do not detect (V>17.15) the object in images taken on UT 2014-08-04.00 and before. Images obtained by J. Fernandez on UT 2014-08-08.06 using 0.4-m telescope at PUC Observatory at Hacienda Santa Martina, by S. Kiyota on UT 2014-08-08.35 using a 0.7-m CDK astrograph at the ITelescope.NET site at Siding Springs Observatory, and by J. Brimacombe on UT 2014-08-08.38 with the RCOS 41-cm telescope near Siding Spring 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 circle has a radius of 3" and is centered on the position of the transient derived from the S. Kiyota image.

The ASAS-SN position of ASASSN-14fd is approximately 6" from the nominal center of an irregular dwarf galaxy PGC 043070 (z=0.015367, d=67.9 Mpc, via NED), giving an absolute V-band magnitude of approximately -17.9 (m-M=34.16, A_V=0.3). 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.