ASAS-SN Discovery of a Very Bright Optical Transient

ATel #6233; K. Z. Stanek, A. B. Davis, T. W.-S. Holoien, B. J. Shappee, C. S. Kochanek, J. Jencson, U. Basu, J. F. Beacom (Ohio State), J. L. Prieto (Princeton/Diego Portales), D. Szczygiel, G. Pojmanski (Warsaw University Observatory), J. Brimacombe (Coral Towers Observatory), D. Bersier (LJMU)
on 14 Jun 2014; 16:30 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-14cl  21:54:57.62  26:41:16        2014-06-14.52     10.66 

ASASSN-14cl was present in four images obtained with two cameras on 2014 June 14 but undetected (V>16.2) on 2014-06-13.5 and earlier. There is a nearby blue SDSS source (21:54:57.68, +26:41:12.76), with g=18.8 and r=18.7, 3" away from our nominal position in the discovery image and 1.1" away from the transient position in the second detector (ASAS-SN image scale is 7.5"/pixel) ASASSN-14cl is most likely a large-amplitude CV outburst, caught very early.

Follow-up observations are encouraged.

We thank LCOGT and its staff for their continued support of ASAS-SN. For more information about the ASAS-SN project, see the ASAS-SN Homepage and the list of all ASAS-SN transients.