Evidence of Anisotropic Modulation in GRB 221009A Spectral Residuals via a Helical Kinematic Spacetime Model from the Southern Hemisphere

This paper presents a phenomenological and observational validation of the helical spatiotemporal metric (formally conceptualized as the Seashell-Universe Model) by processing open-access data from the gamma-ray burst GRB 221009A ("The BOAT"). Utilizing the spectral flux records obtained by the LHAASO-KM2A detector and the theoretical attenuation matrices for Lorentz Invariance Violation (LIV), we numerically modeled the anisotropic response induced by the rotational and translational kinematics of a reference laboratory located in Montevideo, Uruguay (λ = -34.9°). The numerical optimization reveals a robust statistical convergence in both the baseline mean flux (2.2751 × 10⁻⁶) and the residual absorption decay ΔL (7.1827 × 10⁻²). Remarkably, the non-linear least-squares algorithm independently converged to a cone plane inclination angle of β = 23.44°, matching with millimetric precision the obliquity of the Earth's ecliptic. This geometric alignment suggests that the residual fluctuations commonly discarded as instrumental background noise possess a coherent kinematic signature, consistent with the Earth's absolute trajectory through a cosmic helix.