This work presents an empirical, information-theoretic analysis of the gravitational-wave event GW190521 in comparison with the historical WOW! radio signal, framed within the Universal Geometric Vibration Principle (PVGU). Although these phenomena arise from fundamentally different physical channels—gravitational and electromagnetic—the study deliberately employs agnostic informational metrics, independent of emission mechanism, astrophysical model, or causal interpretation. Publicly available data were analyzed using spectral entropy, normalized WOW-like concentration metrics, sliding phase coherence, and algorithmic compressibility. These descriptors were selected to quantify structural organization, temporal concentration, and informational complexity in transient signals. Reference datasets, including classical chirp waveforms and stochastic noise, were used to establish baseline informational regimes. The results show that GW190521 and the WOW! signal occupy a shared intermediate informational regime, clearly distinct from both broadband noise and classical deterministic chirps. Both events exhibit moderate spectral entropy, elevated structural compressibility, and transient phase coherence, consistent with highly organized, short-duration excitations rather than extended causal processes. In contrast, chirp signals display higher predictability and lower compressibility, while noise presents maximal entropy and minimal structural organization. Within the PVGU framework, these findings are interpreted as manifestations of brief geometric discharges, in which energy and information emerge from constrained vibrational modes of spacetime geometry. This interpretation does not invoke artificiality or non-standard physics, but instead proposes a unifying geometric-informational description for extreme astrophysical events. The study demonstrates that cross-domain similarities can emerge when signals are analyzed beyond channel-specific paradigms, supporting the PVGU as a consistent phenomenological framework for transient cosmic phenomena.