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ASAS-SN Confirmation of a Bright, Fast-Rising Supernova in NGC 613

ATel #9521; B. Nicholls (Mt. Vernon Obs., New Zealand), J. S. Brown (Ohio State), Subo Dong (KIAA-PKU), K. Z. Stanek, T. W.-S. Holoien, C. S. Kochanek, J. Shields (Ohio State), B. J. Shappee (Hubble Fellow, Carnegie Observatories), J. L. Prieto (Diego Portales; MAS), D. Bersier (LJMU), S. Bose, Ping Chen (KIAA-PKU), J. Brimacombe (Coral Towers Observatory)
on 21 Sep 2016; 15:23 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Jonathan Brown (brown@astronomy.ohio-state.edu)

Subjects: Optical, Supernovae, Transient

Referred to by ATel #: 9526, 9528, 9529, 9536, 9556, 9561, 9562, 9573, 9576, 9761

During the ongoing All Sky Automated Survey for SuperNovae (ASAS-SN or "Assassin"), using data from the quadruple 14-cm "Cassius" telescope in Cerro Tololo, Chile, we confirmed a bright supernova candidate in NGC 613.

The transient is present in ASAS-SN "Cassius" data on UT 2016-09-21.29 (V~15.0). We do not detect (V>17.3) the transient in images taken on UT 2016-09-20.16 and before. The transient was also confirmed by B. Nicholls in images taken on 2016-09-21. This figure shows the archival DSS image of the host (left) and the B. Nicholls confirmation image (right). The red circle has a radius of 5" and shows the location of the transient in the B. Nicholls image.

The position of the transient is approximately 78.4" South and 49.1" West from the center of the galaxy NGC 613 (z=0.004940, d=17.1 Mpc, via NED), giving an absolute V-band magnitude of approximately -16.2 (m-M=31.16, A_V=0.053). Properties of the new source and photometry are summarized in the tables below:

Host         RA (J2000)     DEC (J2000)         UT Date         V mag    Approx. Abs. Mag   Offset from Host (") 
NGC 613      01:34:14.407   -29:26:24.46     2016-09-21.29      15.0          -16.2               92.5 
Obs. UT Date         V mag 
2016-09-20.16        >17.3 
2016-09-21.29         15.0 

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, and the 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.