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Using publicly available gamma-rays data from the Fermi satellite and theFermitools package, we constructed 867-day light curves of Sagittarius A* tosearch for potential periodicities from 2008 to 2024. By applying statisticaland computational inference methods, we used periodograms, a window function,unsupervised machine learning (K-Means), the Markov Chain Monte Carlo method,noise colour analysis, and phase-folding techniques. Additionally, the datasetswere fitted with a Jacobi elliptical function using a likelihood approach. Intotal, 1,463,040 minutes were analysed. This analysis revealed a significantperiod of enhanced activity lasting ~78 minutes, followed by a quiescent phaseof about ~18 minutes, resulting in a total quasi-periodic oscillation (QPO) ofaround 96 minutes.

A 78- and 96- minute quasi-periodic gamma-ray oscillations in Sagittarius A*