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ASAS-SN Discovery of A Probable Supernova in PGC 128348

ATel #6637; T. W.-S. Holoien (Ohio State), B. J. Shappee (Hubble Fellow, Carnegie Observatories), K. Z. Stanek, C. S. Kochanek, A. B. Davis, G. Simonian, U. Basu, J. F. Beacom (Ohio State), J. L. Prieto (Diego Portales; MAS), D. Bersier (LJMU), J. Brimacombe (Coral Towers Observatory), D. Szczygiel, G. Pojmanski (Warsaw University Observatory)
on 29 Oct 2014; 03:12 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 #: 6661

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 128348:

Object       RA (J2000)     DEC (J2000)      Disc. UT Date   Disc. V mag 
ASASSN-14jg  23:33:13.90    -60:34:11.5      2014-10-29.05    14.9 

ASASSN-14jg was discovered in images obtained on UT 2014-10-29.05 at V~14.9 mag. We also detect the object in images obtained on UT 2014-10-23.11 (V~15.2) and UT 2014-10-21.12 (V~15.4). We do not detect (V>17.4) the object in images taken on UT 2014-10-14.16 and before. See the ASAS-SN light curve here. This figure shows the ASAS-SN V-band reference image (left), the archival DSS image (middle), and the ASAS-SN V-band discovery subtraction image (right). The red circle has a radius of 10” and is centered on the ASAS-SN position of the transient.

The position of ASASSN-14jg is approximately 8.5" North and 12.5" East from the center of the galaxy PGC 128348 (z=0.014827, d=59.6 Mpc, via NED), giving an absolute V-band magnitude of approximately -19.0 (m-M=33.88, A_V=0.041). 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.