ASAS-SN Discovery of a Probable Supernova in PGC 004701

ATel #5138; C. S. Kochanek, B. J. Shappee, K. Z. Stanek, J. Jencson, U. Basu, J. F. Beacom (Ohio State), J. L. Prieto (Princeton), D. Szczygiel, G. Pojmanski (Warsaw University Observatory), M. Dubberley, M. Elphick, S. Foale, E. Hawkins, D. Mullens, W. Rosing, R. Ross, Z. Walker (Las Cumbres Observatory)
on 17 Jun 2013; 19:28 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Benjamin Shappee (shappee@astronomy.ohio-state.edu)

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During the ongoing All Sky Automated Survey for SuperNovae (ASAS-SN or "Assassin"; ATel #4987, #4999, #5010, #5082, #5102, #5110), using data from the double 14-cm "Brutus" telescope in Haleakala, Hawaii, we discovered a new (probable) supernova:

 
Object       RA (J2000)   DEC (J2000)      Disc. UT Date   Disc. V mag 
ASASSN-13ar  1:18:41.76  -7:26:39.70      2013 June 17.61     15.2 

The source is visible with equal brightness in two successive images, and no source is visible at this location in the last prior image on 2013 Feb 4 (V>17) or earlier images. The source is approximately 23 arcsec NW of the z=0.01775 face-on spiral galaxy PGC 004701, giving it an absolute magnitude of approximately -19.2 mag ((m-M)=34.3, A_V=0.15, Schlafly & Finkbeiner 2011) and an offset of 8 kpc for a distance of 70 Mpc. Discovery images can be found here.