"I spotted the Gnatcatcher at 09:30 on Saturday (Dec 04) at the Cook street entrance to Beacon Hill park. It was foraging erratically at the tree tops usually alone, but was accompanied by a loose flock of Ruby and Golden-crowned Kinglets. After half an hour or so, the Gnatcatcher and Kinglets moved on towards James Bay. I never did check for the bird again."
Dec 10 UPDATE: Still present in the AM-- in the same area (in between the tennis courts and the maintenance yard). Later on at 1030, it was near the totem pole, then around 1130 it was in the SE corner of the park.
--You can also track some of the previous sighting locations HERE.