[vsnet-alert 17713] ASAS-SN Discovery of a Bright, Large Amplitude CV Outburst Caught Early

[Kris Stanek]

http://www.astronomerstelegram.org/?read=6455

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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-14gz  17:23:25.95   +33:04:12.08      2014-09-09.26      14.2

ASASSN-14gz was discovered in images obtained 2014 UT September 9.26 at 
V~14.2 mag. We do not detect this object (V>16.5) in images taken on 2014 
UT September 8.29 and before. There is a faint and blue (g=21.9, r=21.8) 
SDSS source 2" away, for which there is an archival SDSS/BOSS 
emission-line spectrum taken in quiescence classifying it as a CV. Given 
the large amplitude of its outburst, ASASSN-14gz may be a WZ Sge-type 
dwarf nova, caught very early. Follow-up observations are encouraged.

SDSS spectrum:

http://skyserver.sdss3.org/dr9/en/tools/explore/obj.asp?id=1237671937119027282