[vsnet-alert 15562] CSS 100202:081936+191540 bright outburst

[Denis Denisenko]

MASTER-Amur has detected this dwarf nova in bright outburst on four
unfiltered survey images today and two nights ago:

CSS 100202:081936+191540
  20130329.566  15.28C  MASTER-Amur
  20130329.595  15.06C  MASTER-Amur
  20130331.490  15.12C  MASTER-Amur
  20130331.519  15.43C  MASTER-Amur

The variable is listed in AAVSO VSX with a magnitude range 17.35-<20.0, see
http://www.aavso.org/vsx/index.php?view=detail.top&oid=239569

CRTS light curve shown at
http://nesssi.cacr.caltech.edu/catalina/20100202/1002021180433134193p.htmlgives
the maximum brightness (16.33m) on 2011 Feb. 04. Outburst peaks
differ by quite a large amount. May be some of them are superoutbursts?
According to the paper by T. Kato et al, 2012, this CV has a 34% chance of
being SU UMa variable and 66% are in favor of SS Cyg type. 1-to-2 chances
are still worth trying the time-resolved photometry.

The variable is identical to SDSS J081936.09+191539.7, see
http://skyserver.sdss3.org/dr8/en/tools/explore/obj.asp?id=1237673807045853588(u=20.88
g=20.36 r=19.94 i=19.75 z=19.91). Large (u-g) and (g-r) color
indices at small (r-i) and (i-z) values may be due to the orbital
variability rather than to large contribution from the secondary (SDSS
obervations in 5 filters are *not* simultaneous).

Denis Denisenko