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Two Bright CV Candidates Discovered by ASAS-SN

ATel #7809; G. Simonian, K. Z. Stanek, J. S. Brown, T. W.-S. Holoien, C. S. Kochanek, A. B. Danilet, U. Basu, J. F. Beacom, T. A. Thompson (Ohio State), B. J. Shappee (Hubble Fellow, Carnegie Observatories), J. L. Prieto (Diego Portales; MAS), D. Bersier (LJMU), Subo Dong (KIAA-PKU), J. Brimacombe (Coral Towers Observatory), E. Falco (CfA), P. R. Wozniak (LANL), D. Szczygiel, G. Pojmanski (Warsaw University Observatory)
on 18 Jul 2015; 19:00 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Krzysztof Stanek (stanek.32@osu.edu)

Subjects: Optical, Cataclysmic Variable, 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 two new transient sources:

 
Object        RA (J2000)    DEC (J2000)     Disc. UT Date   Disc. V mag 
ASASSN-15mt   19:12:35.39   +50:34:39.3     2015-07-18.42   13.7 
ASASSN-15mu   22:52:33.11   +10:20:25.0     2015-07-18.48   13.6

ASASSN-15mt was discovered at V=13.7 in "Brutus" images taken on 2015-07-18.42, but not present (V>17.5) in images taken on 2015-07-13.42. At the position of the transient, Vizier reports a match to a faint B=20.0 USNO source. This transient also lies within the Kepler field as KIC 12055999. Photometry from the Kepler-INT survey (Greiss et al 2012) yields magnitudes: U=19.1, g=19.9, r=19.5, i=19.0, Ha=18.6.

ASASSN-15mu was discovered at V=13.6 in "Brutus" images taken on 2015-07-18.48, but not present (V>17.3) in images taken on 2015-07-14.45. At the position of the transient, Vizier reports a match to a g=18.4 SDSS source, with a fairly red SDSS color of u-g=0.87.

Both ASASSN-15mt and ASASSN-15mu are most likely dwarf nova outbursts. 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 more information about the ASAS-SN project, see the ASAS-SN Homepage and the list of all ASAS-SN transients.