[vsnet-outburst 16412] Re: [vsnet-alert] ASASSN-14ac (ATEL)

[Roger Pickard]

This object is still very bright at about 14.5V on 2014 Jan 19.90

Roger Pickard

----- Original Message ----- 
From: "Taichi Kato" <tkato at kusastro.kyoto-u.ac.jp>
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Sent: Sunday, January 19, 2014 12:51 AM
Subject: [vsnet-alert] ASASSN-14ac (ATEL)


>   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.
>
>
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