打ち上げ成功した模様です。
> Sentinel-1B lifted off on a Soyuz rocket, flight VS14, from Europe's
> Spaceport in French Guiana on 25 April 2016 at 21:02 GMT (23:02 CEST).
> With the Sentinel-1 mission designed as a two-satellite constellation,
> Sentinel-1B will join its identical twin, Sentinel-1A, which was launched
> two years ago from Kourou. Both satellites carry an advanced radar that
> images Earth's surface through cloud and rain regardless of whether
> it is day or night. By orbiting 180° apart, global coverage and data
> delivery are optimised for the environmental monitoring Copernicus
> programme. The mission provides radar imagery for a multitude of services
> and applications to improve everyday life and understand our changing
> planet. Three CubeSats piggybacked a ride on Soyuz. These small satellites,
> each measuring just 10×10×11 cm, have been developed by university
> student teams through ESA's Fly Your Satellite! effort. The other
> passenger is the Microscope satellite from France's CNES space agency.
http://www.esa.int/spaceinvideos/Videos/2016/04/Sentinel-1B_lifts_off