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ASAS-SN Discovery of A Probable Supernova in SDSS J150130.77-003222.8

ATel #7090; S. Kiyota (Variable Star Observers League in Japan), T. W.-S. Holoien, K. Z. Stanek, C. S. Kochanek, A. B. Danilet, 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), J. Brimacombe (Coral Towers Observatory), Subo Dong (KIAA-PKU), P. R. Wozniak (LANL), E. Falco (CfA), D. Szczygiel, G. Pojmanski (Warsaw University Observatory), R. A. Koff (Antelope Hills Observatory), B. Nicholls (Mt. Vernon Observatory, New Zealand)
on 17 Feb 2015; 15:34 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 #: 7103

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 SDSS J150130.77-003222.8:

Object       RA (J2000)     DEC (J2000)      Disc. UT Date   Disc. V mag 
ASASSN-15dc  15:01:30.82   -00:32:24.38      2015-02-16.54    17.2 

ASASSN-15dc was discovered in images obtained on UT 2015-02-16.54 at V~17.2 mag. We do not detect (V>17.1) the object in images taken on UT 2015-02-15.55 and before. An image obtained by S. Kiyota on UT 2015-02-17.51 using a Planewave CDK 0.61-m telescope located at Sierra Remote Observatory confirms the discovery of the transient. This figure shows the archival SDSS g-band image of the host (left) and the S. Kiyota confirmation image (right). The red circle has a radius of 3.0" and is centered on the position of the transient in the S. Kiyota image.

The position of ASASSN-15dc is approximately 1.5" South and 0.7" East from the center of the galaxy SDSS J150130.77-003222.8 (z=0.041605, d=179 Mpc, via NED), giving an absolute V-band magnitude of approximately -19.2 (m-M=36.27, A_V=0.176). 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.