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ASAS-SN Discovery of A Probable Supernova in IC 4462

ATel #6358; J. Brimacombe (Coral Towers Observatory), E. Conseil (Association Francaise des Observateurs d'Etoiles Variables), I. Cruz (Cruz Observatory), S. Kiyota (Variable Star Observers League in Japan), 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), D. Szczygiel, G. Pojmanski (Warsaw University Observatory), W. Wiethoff (Arrowhead Astronomical Society of Duluth)
on 1 Aug 2014; 17:31 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 #: 6420

During the ongoing All Sky Automated Survey for SuperNovae (ASAS-SN or "Assassin"), using data from the quadruple 14-cm "Brutus" telescope in Haleakala, Hawaii, we discovered a new transient source, most likely a supernova, in the galaxy IC 4462:

Object       RA (J2000)     DEC (J2000)      Disc. UT Date   Disc. V mag 
ASASSN-14es  14:35:01.754   +26:32:38.91     2014-07-27.28    17.0 

ASASSN-14es was discovered in images obtained on UT 2014-07-27.28 at V~17.0 mag. We also detect the source in images obtained on UT 2014-07-28.28 (V~17.1), UT 2014-07-29.28 (V~16.8), and UT 2014-07-30.27 (V~16.7), but we do not detect (V>17.3) the object in images taken on UT 2014-07-26.28 and before. Images obtained by J. Brimacombe on UT 2014-07-28.41 with the RCOS 41-cm telescope near Siding Spring Observatory, by E. Conseil on UT 2014-07-31.88 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, by I. Cruz on UT 2014-08-01.06 with a Planewave CDK-17 43-cm telescope (+Apogee CG16M camera) located near Reynoldsburg, Ohio, and by S. Kiyota on UT 2014-08-01.39 using a 0.5m CDK + FLI PL-9000 at the ITelescope.NET site at Siding Springs Observatory confirm the discovery of the transient. This figure shows the archival SDSS g-band image (left), the 2014-07-28 J. Brimacombe image (center), and the 2014-08-01 S. Kiyota image (right). The red circle is centered on the position of the transient in the S. Kiyota image.

The ASAS-SN position of ASASSN-14es is approximately 0.9" North and 2.0" West from the center of the galaxy IC 4462 (z=0.030705, d=132 Mpc, via NED), giving an absolute V-band magnitude of approximately -18.7 (m-M=35.60, A_V=0.071). 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.