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ASAS-SN Discovery of A Probable Supernova in SDSS J093916.69+062551.1

ATel #6919; Consuelo Gonzalez, Carlos Contreras (Las Campanas Observatory), Eric Y. Hsiao (Aarhus University), J. Brimacombe (Coral Towers Observatory), S. Kiyota (Variable Star Observers League in Japan), Subo Dong (KIAA-PKU), K. Z. Stanek, A. B. Davis, T. W.-S. Holoien, C. S. Kochanek, 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), P. R. Wozniak (LANL), D. Szczygiel, G. Pojmanski (Warsaw University Observatory), E. Conseil (Association Francaise des Observateurs d'Etoiles Variables), J. M. Fernandez (Pontifica Universidad Catolica), R. A. Koff (Antelope Hills Observatory), B. Nicholls (Mt. Vernon Obs., New Zealand)
on 14 Jan 2015; 19:32 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 #: 6920

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 J093916.69+062551.1:

Object      RA (J2000)     DEC (J2000)       Disc. UT Date   Disc. V mag 
ASASSN-15as  09:39:16.55    06:25:48.54     2015-01-13.44     16.3 

ASASSN-15as was discovered in images obtained on UT 2015-01-13.44 at V~16.3 mag. It was also detected on UT 2015-01-10.47 at V~16.4. We do not detect (V>17.1) the object in images taken on UT 2015-01-01.41 and before. An image obtained by Swope 1.0m at Las Campanas Observatory on UT 2015-01-14.25 confirms the discovery of the transient. This figure shows the archival SDSS image of the host (left) and the Swope V-band confirmation image (right). The green circle has a radius of 5.0" and is centered on the position of the transient in the Swope image.

The position of ASASSN-15as is approximately 3.4" from the center of the galaxy SDSS J093916.69+062551.1, which does not have a known spectroscopic redshift measurement. 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.