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ASAS-SN Discovery of A Probable Supernova in 2MASX J15060265+0733415

ATel #7878; J. Brimacombe (Coral Towers Observatory), T. W.-S. Holoien, K. Z. Stanek, C. S. Kochanek, J. S. Brown, A. B. Danilet, G. Simonian, U. Basu, 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), E. Falco (CfA), P. R. Wozniak (LANL), D. Szczygiel, G. Pojmanski (Warsaw University Observatory), S. Kiyota (Variable Star Observers League in Japan), G. Masi (Virtual Telescope Project, Ceccano, Italy), W. Wiethoff (University of Minnesota, Duluth)
on 6 Aug 2015; 14:23 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 #: 7888

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 J15060265+0733415.

ASASSN-15np was discovered in images obtained on UT 2015-08-06.26 at V~17.1 mag. We do not detect (V>16.8) the object in images taken on UT 2015-08-01.25 and before. An image obtained by J. Brimacombe on UT 2014-08-06.39 with the CDK 43-cm telescope at Savannah Skies Observatory confirms the discovery of the transient. This figure shows the archival SDSS g-band image of the host (left) and the J. Brimacombe confirmation image (right). The red circle has a radius of 2" and is centered on the position of the transient in the J. Brimacombe image.

The position of ASASSN-15np is approximately 0.2" South and 0.3" West from the center of the galaxy 2MASX J15060265+0733415 (z=0.037688, d=162 Mpc, via NED), giving an absolute V-band magnitude of approximately -19.0 (m-M=36.05, A_V=0.084). Properties of the new source and photometry are summarized in the tables below:

Object       RA (J2000)     DEC (J2000)      Disc. UT Date   Disc. V mag  Approx. Abs. Mag   Offset from Host (") 
ASASSN-15np  15:06:02.65    +07:33:41.54     2015-08-06.26       17.1          -19.0               0.36 
Obs. UT Date         V mag 
2015-08-01.25        >16.8 
2015-08-06.26         17.1 

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.