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

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 2013 January to 2021 October. 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 similar to 238 days with a similar to 63.2% duty cycle. Based on our analysis, we further predict two upcoming active windows of the X-ray bursts. Since 2021 July, the beginning date of our first prediction has been confirmed by the ongoing X-ray activities of the SGR J1935+2154.

Automated summary

The study systematically searched for X-ray bursts of SGR J1935+2154 using Fermi Gamma-ray Burst Monitor data, identifying 8 bursting phases and 353 individual bursts. Analysis revealed bursts exhibiting a 238-day period with a 63.2% duty cycle. Predictions of two upcoming active windows of X-ray bursts were made based on the analysis, with the first prediction confirmed by ongoing X-ray activities of SGR J1935+2154 since July 2021.