Today's sightings generally focus on the south ( or some folks call it upper) Lullwater,the body of water between the Terrace Bridge and the Lefrak Rink.
A confidante who saw the bird says it was along the Breeze Hill shoreline opposite the Peninsula pink concrete beach.
Check the Prospect map links on my blog menu also available thru the Brooklyn bird club website.
It seems to favor this area with just one foray outside the south Lullwater. Best to start from the rink towards left of the Lincoln Statue to the shoreline path that goes around south Breeze Hill.