[vsnet-newvar 4276] ASASSN-14ac (ATEL)

[Taichi Kato]

   The SDSS color u-g = -0.3 is very blue for a WZ Sge-type
candidate.  Time-series observations and spectroscopic
observation are encouraged!

==============================================================================
ATEL #5775							     ATEL #5775

Title:	ASAS-SN Discovery of a Large Amplitude (Delta V ~ 7 mag) CV
		Candidate
Author:	B. J. Shappee, K. Z. Stanek, C. S. Kochanek, T. W.-S. Holoien,
		J. Jencson, U. Basu J. F. Beacom (Ohio State), J. L. Prieto (Princeton),
		D. Szczygiel, G. Pojmanski (Warsaw University Observatory), J. Brimacombe
		(Coral Towers Observatory), D. Bersier (LJMU)
Queries:	shappee at astronomy.ohio-state.edu
Posted:	18 Jan 2014; 22:50 UT
Subjects:Optical, Cataclysmic Variable

During the ongoing <a href="http://www.astronomy.ohio-state.edu/~assassin/index.shtml">
All Sky Automated Survey for SuperNovae</a> (ASAS-SN 
or "Assassin"), using data from the recently expanded quadruple 14-cm "Brutus"
telescope in Haleakala, Hawaii, 
we discovered a new bright transient source:

Object       RA (J2000)   DEC (J2000)      Disc. UT Date   Disc. V mag

ASASSN-14ac  7:52:54.9  +53:05:31.2        2014 Jan. 18.31     14.54 

ASASSN-14ac was discovered in images obtained 2014 UT Jan. 18.31 at V~14.5
and was detected in images obtained 2014 UT Jan. 17.46, but was undetected
(V > 17) in images obtained on 2014 UT Jan. 11.29.  The discovery image
can be found <a href="http://www.astronomy.ohio-state.edu/~assassin/followup/ASASSN-14ac.png">
here</a>.  Vizier reveals a 0.1" SDSS match to a blue g=21.6 star. ASASSN-14ac
is most likely a CV with a very strong, nearly 7 mag outburst. Given the
large amplitude of its outburst, ASASSN-14ac may be a WZ Sge-type dwarf
nova. 

We thank LCOGT and its staff for their continued support of ASAS-SN.