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ASAS-SN Discovery of A Possible Supernova in PGC 053612

ATel #6360; E. Conseil (Association Francaise des Observateurs d'Etoiles Variables), T. W.-S. Holoien, K. Z. Stanek, 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), J. Brimacombe (Coral Towers Observatory), I. Cruz (Cruz Observatory), S. Kiyota (Variable Star Observers League in Japan), W. Wiethoff (Arrowhead Astronomical Society of Duluth), D. Szczygiel, G. Pojmanski (Warsaw University Observatory)
on 2 Aug 2014; 00:18 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 #: 6363

During the ongoing All Sky Automated Survey for SuperNovae (ASAS-SN or "Assassin"), using data from the recently commissioned double 14-cm "Cassius" telescope in Cerro Tololo, Chile, we discovered a new transient source, possibly a supernova, near the galaxy PGC 053612:

 
Object       RA (J2000)     DEC (J2000)      Disc. UT Date   Disc. V mag 
ASASSN-14eu  15:00:36.84    -03:50:48.9      2014-08-01.02    16.6 

ASASSN-14eu was discovered in images obtained on UT 2014-08-01.02 at V~16.6 mag. We do not detect (V>17.15) the object in images taken on UT 2014-07-26.04 and before. An image obtained on 2014-08-01.95 by E. Conseil using a 0.35m f/11 Schmidt-Cassegrain + ST-10XME (Kodak KAF-3200E CCD) from Slooh Space robotic telescope T2 at Mt. Teide, Canary Islands confirms the discovery of the transient. This figure shows the archival DSS image of the host (left) and the E. Conseil confirmation image (right). The red circle has a radius of 5" and is centered on the position of the transient.

The ASAS-SN position of ASASSN-14eu is approximately 41.1" North and 29.4" West from the center of the galaxy PGC 053612 (z=0.022722, d=97.9 Mpc, via NED), giving a projected distance of ~24 kpc from the host nucleus. At this distance, the transient would have an absolute V-band magnitude of approximately -18.8 (m-M=34.95, A_V=0.422).

Given the relatively large projected distance of the transient from the potential host galaxy, this transient could also be a chance projection, though Vizier indicates no apparent stellar counterparts. Follow-up observations, especially spectroscopy, 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.