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ASAS-SN Discovery of A Probable Supernova in PGC 006240

ATel #6858; T. W.-S. Holoien, K. Z. Stanek, C. S. Kochanek, A. B. Davis, G. Simonian, U. Basu, N. Goss, J. F. Beacom (Ohio State), B. J. Shappee (Hubble Fellow, Carnegie Observatories), 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 30 Dec 2014; 02:01 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 #: 6861, 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 006240:

 
Object       RA (J2000)     DEC (J2000)      Disc. UT Date   Disc. V mag 
ASASSN-14mw  01:41:25.16   -65:37:01.26      2014-12-29.08    16.8 

ASASSN-14mw was discovered in images obtained on UT 2014-12-29.08 at V~16.8 mag. We do not detect (V>17.5) the object in images taken on UT 2014-12-26.09 and before. An image obtained on UT 2014-12-30.04 with the LCOGT 1-m robotic telescope at Cerro Tololo Observatory confirms the discovery of the transient. This figure shows the archival DSS image of the host (left) and the LCOGT confirmation image (right). The red circle has a radius of 3" and is centered on the position of the transient in the LCOGT image.

The position of ASASSN-14mw is approximately 5.2" South and 35.9" West from the center of the galaxy PGC 006240 (z=0.027406, d=114 Mpc, via NED), giving an absolute V-band magnitude of approximately -18.5 (m-M=35.28, A_V=0.056). At the distance of the host galaxy, this gives a separation of roughly 20 kpc. 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.