Donuel, Swift has detected 1000 Gamma Ray Bursts in 12 years, some of these will result from the formation of black holes, but not all. The rate won't increase because its limited by the sensitivity of the detectors. It isn't clear that the mission will last long enough to work in tandem with JWST, in any case JWST is not a rapid reaction telescope and is the wrong thing to work in tandem with SWIFT. The Large Synoptic Survey telescope may be, but again its not clear if it will be running during the lifetime of the Swift mission. Networks of smaller telescopes are the thing.