International Conference of Physicists.SPb, October 20-24, 2025, Saint Petersburg
Astronomy and Astrophysics

Investigation of the dynamics of the oscillations of the light curve of the $\gamma$-burst GRB 240825A

P. B. Dmitriev^a, V. A. Dranevich<sup>b

a</sup> Ioffe Institute, St. Petersburg
^b Independent researcher, Saint Petersburg, Russia

Abstract: As a result of studying the temporal structure of the light curve of the GRB 240825A $\gamma$-ray burst, recorded by Swift satellite equipment in the energy range of 15 – 350 keV, for the presence of quasi-periodic components, oscillations with periods of 0.384, 0.768, 1.224 and 1.536 s were detected. Moreover the oscillation with a period of 1.536 s turned out to be modulated with the same period. Assuming that the modulation is caused by the relativistic Doppler effect during the orbital motion of the emitting object around a more massive central body, the orbital parameters of the emitting object and the mass of the central body were calculated in the classical approximation.

Keywords: periodogramanalysis, quasiperiodicities, model – amplitude-frequency modulation.

Received: 04.05.2025
Revised: 26.07.2025
Accepted: 29.07.2025

DOI: 10.61011/JTF.2025.12.61784.228-25

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