Monitor the variability
From VVV Survey
Goal 6: To monitor the variability around the Galactic Center
An area of 1.5 sq deg around the Galactic Center including the 180 pc-Nuclear Ring  will be the most frequently monitored field, for a total of 200 epochs spanning 5 years. Expected variability due to high magnification microlensing, or flares due to black hole accretion, can arise . The BH flares easily reach K ~ 16 mag, with a typical duration of 10-30 min. The expected flare rate is 2-6 per day , in addition to a longer timescale variation predicted by the accretion simulations. We also expect some Wolf Rayet variability in the population of massive stars and clusters in this region, and will search for eclipsing WR stars.