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ASAS-SN Discovery of A Probable Supernova in VV 790a

ATel #8480; G. Masi (Virtual Telescope Project, Ceccano, Italy), I. Cruz (Cruz Observatory), J. Brimacombe (Coral Towers Observatory), 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), S. Kiyota (Variable Star Observers League in Japan), L. A.G. Monard (Klein Karoo Observatory)
on 31 Dec 2015; 04:02 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 VV 790a.

ASASSN-15uu was discovered in images obtained on UT 2015-12-29.34 at V~16.7 mag. We also detect the object in images obtained on UT 2015-12-30.28 (V~16.5). We do not detect (V>16.8) the object in images taken on UT 2015-12-27.36 and before. Multiple images obtained on 2015-12-30 confirm the discovery of the transient. This figure shows the archival SDSS g-band image of the host (left) and the I. Cruz confirmation image (right). The red circle has a radius of 5" and is centered on the position of the transient in the I. Cruz image.

The position of ASASSN-15uu is approximately 1.6" North and 0.2" East from the center of the galaxy VV 790a (z=0.026795, d=108 Mpc, via NED), giving an absolute V-band magnitude of approximately -18.6 (m-M=35.12, A_V=0.188). 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-15uu  01:43:56.574  +17:03:44.44      2015-12-29.34      16.7          -18.6                1.61 
Obs. UT Date         V mag 
2015-12-27.36        >16.8 
2015-12-29.34         16.7 
2015-12-30.28         16.5 

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 Center for Cosmology and AstroParticle Physics (CCAPP) at OSU, the Mt. Cuba Astronomical Foundation, George Skestos, and the Robert Martin Ayers Sciences Fund. For more information about the ASAS-SN project, see the ASAS-SN Homepage and the list of all ASAS-SN transients.