Distance constraints from the nondetection of wavefront curvature for short GRBs jointly observed by Konus-Wind and BAT. Each point shows the conservative 3σ lower limit D_min inferred for an individual event. The most constraining case reaches D_min ≈ 1.2 AU, showing that current observations have already entered the Solar System-scale regime relevant to nearby PBH searches. Although the present sample mainly yields lower limits, it has already reached the distance scale at which direct geometric searches for nearby PBH bursts become meaningful.