A Very Bright, High-Amplitude CV Candidate Discovered by ASAS-SN

ATel #6981; G. Simonian, A. B. Danilet, K. Z. Stanek, C. S. Kochanek, T. W.-S. Holoien, U. Basu, N. Goss, J. F. Beacom (Ohio State), B. J. Shappee (Hubble Fellow, Carnegie Observatories), J. L. Prieto (Diego Portales; MAS), D. Bersier (LJMU), Subo Dong (KIAA-PKU), P. R. Wozniak (LANL), J. Brimacombe (Coral Towers Observatory), D. Szczygiel, G. Pojmanski (Warsaw University Observatory)
on 23 Jan 2015; 17:50 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 quadruple 14-cm "Brutus" telescope in Haleakala, Hawaii, we discovered a new transient source:

 
Object        RA (J2000)    DEC (J2000)     Disc. UT Date   Disc. V mag 
ASASSN-15bp   12:12:40.410  +04:16:56.21    2015-01-23.52     11.9 

ASASSN-15bp was discovered at V=11.9 in ``Brutus'' images taken on 2015-01-23.52, but not present (V>17.2) in images taken on 2015-01-20.52. At the position of the transient, Vizier reports a match to a faint g=20.5 blue SDSS source, as well as a nearby GALEX NUV=20.9 source. Archival observations from the Catalina Real-time Transient Survey (CRTS) do not show outbursts, but do indicate variability spanning two magnitudes, possibly due to eclipses.

Given the large amplitude of its outburst, this transient is most likely a WZ Sge-type dwarf nova. Follow-up observations are encouraged.

We thank LCOGT and its staff for their continued support of ASAS-SN. ASAS-SN is supported in part by Mt. Cuba Astronomical Foundation.

For ASAS-SN data for this and many other CVs, see ASAS-SN CV Patrol website, updated in real time.