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ASAS-SN Discovery of A Probable Supernova in UGC 00402

ATel #8111; J. S. Brown, K. Z. Stanek, T. W.-S. Holoien, C. S. Kochanek, D. Godoy-Rivera, U. Basu (Ohio State), B. J. Shappee (Hubble Fellow, Carnegie Observatories), J. L. Prieto (Diego Portales; MAS), D. Bersier (LJMU), Subo Dong, Ping Chen (KIAA-PKU), J. Brimacombe (Coral Towers Observatory)
on 1 Oct 2015; 19:51 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Jonathan Brown (brown@astronomy.ohio-state.edu)

Subjects: Optical, Supernovae, Transient

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 UGC 00402.

ASASSN-15qc was discovered in images obtained on UT 2015-10-01.48 at V~15.6 mag. We do not detect (V>16.2) the object in images taken on UT 2015-09-25.35 and before. This figure shows the archival SDSS g-band image of the host (left), the ASAS-SN prediscovery image (center), and the ASAS-SN discovery image (right). The red circle has a radius of 5" and is centered on the position of the transient in the discovery image.

The position of ASASSN-15qc is approximately 10.2" South and 9.9" West from the center of the galaxy UGC 00402 (z=0.017649, d=68.7 Mpc, via NED), giving an absolute V-band magnitude of approximately -18.6 (m-M=34.18, A_V=0.070). 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-15qc  00:39:17.98    03:57:00.14      2015-10-01.48      15.6          -18.6               14.25 
Obs. UT Date         V mag 
2015-09-25.35        >16.2 
2015-10-01.48         15.6 

Follow-up observations are encouraged.

We thank LCOGT and its staff for their continued support of ASAS-SN. ASAS-SN is supported by NSF grant AST-1515927, the Mt. Cuba Astronomical Foundation, the Center for Cosmology and AstroParticle Physics (CCAPP) at OSU, and the Robert Martin Ayers Science Fund. For more information about the ASAS-SN project, see the ASAS-SN Homepage and the list of all ASAS-SN transients.