We study how to identify the gravitational wave events from mergingstellar mass black binaries like GW150914. Methods: We briefly investigatethe possible growth and merging processes of the two stellar mass blackholes in the merging event of GW150914 detected by aLIGO, as clocked by adistant external observer, as well as the prospect of detecting theGW150914-like events using pulsar timing. Results: Our main results are: (1)The description of the black hole growth using stationary metric of apre-existing black hole is inconsistent with GW150914; (2) Onlygravitational wave radiation can be produced in the coalescence of two blackholes such as that in the GW150914 event; and (3) Pulsar timing can notdetect the GW150914-like events. Conclusions: Future high sensitivitydetections of gravitational waves from merging black holes might be used toprobe matter distribution and space-time geometry in the vicinity of thehorizon. Perhaps the GW150914-like events can be identified with traditionalastronomy observations only if the black holes are embedded in extremelydense medium before their final merge, when very strong electromagneticradiation is produced and can escape from the system.