[vsnet-alert 16801] Re: [vsnet-alert] ASASSN-14ac (ATEL)

[Roger Pickard]

A steady decline from around 14.6V to 14.65V between 2014/19 at 21.21 
and 2014/20 at 04.37.

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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>