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ASAS-SN Discovery of A Probable Supernova in PGC 902451

ATel #6867; B. J. Shappee (Hubble Fellow, Carnegie Observatories), K. Z. Stanek, T. W.-S. Holoien, C. S. Kochanek, A. B. Davis, G. Simonian, U. Basu, N. Goss, J. F. Beacom (Ohio State), J. L. Prieto (Diego Portales; MAS), D. Bersier (LJMU), Subo Dong (KIAA-PKU), P. R. Wozniak (LANL), J. Brimacombe (Coral Towers Observatory), D. Szczygiel, G. Pojmanski (Warsaw University Observatory)
on 3 Jan 2015; 12:02 UT
Credential Certification: Benjamin Shappee (shappee@astronomy.ohio-state.edu)

Subjects: Optical, Supernovae, Transient

Referred to by ATel #: 6882

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 902451:

Object       RA (J2000)   DEC (J2000)      Disc. UT Date   Disc. V mag 
ASASSN-15ad  6:23:44.87 -16:05:51.0      2014 Dec 29.18  16.6 
ASASSN-15ad was discovered in images obtained on UT 2014-12-29.18 at V~16.6 mag. We also detect the object in images obtained on UT 2014-12-25.19 (V~16.7). We do not detect (V>17) the object in images taken on UT 2014-12-20.18 and before. An image obtained on UT 2015-01-03.23 with IMACS on the Baade 6.5-m telescope at Las Campanas Observatory confirms the discovery of the transient. This figure shows the archival DSS image of the host (right) and the Baade/IMACS R-band confirmation image (left). The 2" circle marks the position of the transient in the Baade/IMACS image.

The position of ASASSN-15ad is approximately 11.0" North and 9.7" East from the center of the galaxy PGC 902451, unlisted in NED. Follow-up observations are encouraged.

We thank LCOGT and its staff for their continued support of ASAS-SN. ASAS-SN is supported in part by Mt. Cuba Astronomical Foundation. For more information about the ASAS-SN project, see the ASAS-SN Homepage and the list of all ASAS-SN transients.