ASAS-SN Discovery of A Probable Supernova in 2MASX J17100856+7443426

ATel #7257; G. Krannich (Roof Observatory Kaufering), T. W.-S. Holoien, K. Z. Stanek, C. S. Kochanek, A. B. Danilet, G. Simonian, U. Basu, N. Goss, J. F. Beacom, T. A. Thompson (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), E. Falco (CfA), J. Brimacombe (Coral Towers Observatory), D. Szczygiel, G. Pojmanski (Warsaw University Observatory), J. G. Carballo (Observatorio Cerro del Viento MPC I84), J. M. Fernandez (Observatory Inmaculada del Molino), S. Kiyota (Variable Star Observers League in Japan), R. A. Koff (Antelope Hills Observatory), W. Wiethoff (University of Minnesota, Duluth)
on 19 Mar 2015; 22:36 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Thomas Holoien (tholoien@astronomy.ohio-state.edu)

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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 2MASX J17100856+7443426:

 
Object       RA (J2000)     DEC (J2000)      Disc. UT Date   Disc. V mag 
ASASSN-15fj  17:10:08.55    +74:43:42.60      2015-03-18.63    17.0 

ASASSN-15fj was discovered in images obtained on UT 2015-03-18.63 at V~17.0 mag. We also detect the object in images obtained on UT 2015-03-19.64 (V~17.2). We do not detect (V>16.9) the object in images taken on UT 2015-03-17.62 and before. An image obtained by G. Krannich on UT 2015-03-19.74 with a 14-inch Meade telescope at Roof Observatory Kaufering confirms the discovery of the transient. This figure shows the archival SDSS g-band image of the host (left) and the G. Krannich confirmation image (right). The red circle has a radius of 3.0" and is centered on the position of the transient in the G. Krannich image.

The position of ASASSN-15fj is approximately 0.4" South and 0.3" West from the center of the galaxy 2MASX J17100856+7443426, an edge-on galaxy with no redshift available in NED. Follow-up observations, particularly spectroscopy, 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.