Periodicity Search on X-ray Bursts of SGR J1935+2154 Using 8.5 yr of Fermi/GBM Data

Abstract

We performed a systematic search for X-ray bursts of the SGR J1935+2154 using the Fermi Gamma-ray Burst Monitor continuous data dated from Jan 2013 to October 2021. Eight bursting phases, which consist of a total of 353 individual bursts, are identified. We further analyze the periodic properties of our sample using the Lomb-Scargle periodogram. The result suggests that those bursts exhibit a period of ~ 238 days with a ~ 63.2% duty cycle. Based on our analysis, we further predict two upcoming active windows of the X-ray bursts. Since July 2021, the beginning date of our first prediction has been confirmed by the ongoing X-ray activities of the SGR J1935+2154.

ApJL published; 16 pages, 11 figures, 3 tables

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• Revisit the periodicity of SGR J1935+2154 bursts with updated sample
• A Comprehensive Analysis on Repeating Fast Radio Bursts
• Discovery of the linear energy-dependence of the spectral lag of X-ray bursts from SGR J1935+2154
• GECAM Observations of the Galactic Magnetar SGR J1935+2154 during the 2021 and 2022 Burst Active Episodes. I. Burst Catalog
• Application of Deep Learning Methods for Distinguishing Gamma-Ray Bursts from Fermi/GBM TTE Data
• FRB$-$SRB$-$XRB: Geometric and Relativistic Beaming Constraints of Fast Radio Bursts from the Galactic Magnetar SGR J1935+2154
• Pulsar and Magnetar Navigation with Fermi/GBM and GECAM
• Neutron star phase transition as the origin for the fast radio bursts and soft gamma-ray repeaters of SGR J1935+2154
• Repeating X-ray bursts: Interaction between a neutron star and clumps partially disrupted from a planet
• Periodic Activities of Fast Radio Burst Repeaters from Precessing Magnetars with Evolving Obliquity