[vsnet-alert 18577] VW CrB outburst

[Denis Denisenko]

MASTER-Kislovodsk robotic telescope has caught this USGU-type dwarf
nova (previously known as Antipin V21) in bright outburst about 10
hours ago:

VW CrB
  20150425.856  14.42C  MASTER-Kislovodsk (Lipunov et al., 2010)
  20150425.860  14.44C  MASTER-Kislovodsk
  20150425.864  14.41C  MASTER-Kislovodsk

This is the brightest magnitude observed for this star by MASTER. The
outburst appears to be quite fresh. Latest negative observation in
AAVSO database is 3 nights ago by Pavol Dubovsky:

  20150423.0597 <156V   DPV

Range in AAVSO VSX is 14.1 V - 20.5 CV, orbital and superhump periods
are 0.0709 and 0.0729 d in RKCat Ver. 7.20. SDSS magnitudes:

SDSS J160003.70+331114.1
u=19.88(4) g=19.88(1) r=19.86(2) i=19.66(2) z=19.23(5)

Denis Denisenko
Sternberg Astronomical Institute of Moscow State University