ASAS-SN Discovery of a Bright CV Candidate

ATel #5082; K. Z. Stanek, B. J. Shappee, C. S. Kochanek, J. Jencson, A. Talabere, 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 23 May 2013; 22:33 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Krzysztof Stanek (stanek.32@osu.edu)

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During the ongoing All Sky Automated Survey for SuperNovae (ASAS-SN or "Assassin"), using data from the double 14-cm "Brutus" telescope in Haleakala, Hawaii, we discovered a new transient source:

 
Object       RA (J2000)   DEC (J2000)     Disc. UT Date     Approx. Disc. V mag 
 
ASASSN-13ak  17:48:27.85  +50:50:40.3     2013 May 23.46          15.4 

ASASSN-13ak was present in images obtained 2013 UT May 23.46 but undetected (V > 17) on 2013 UT May 2.5 and earlier (we had a gap in our May 2013 time coverage due to a technical problem). Vizier reveals an optical source with B = 19.8 detected 0.6" from our ASAS-SN position in the USNO-B1 catalog (there is also a 0.6" SDSS match with a blue, g=19.9 star). There are no galaxies near the position of ASASSN-13ak. ASASSN-13ak is a likely CV in outburst.