Detection of Quasi-periodic Oscillations in SGR 150228213

The detection of quasi-periodic oscillations (QPOs) in magnetar giant flares (GFs) has brought a new perspective to studies of the mechanism of magnetar bursts. Due to the scarcity of GFs, searching for QPOs in magnetar short bursts is reasonable. Here we report the detection of a narrow QPO at approximately 110 Hz and a wide QPO at approximately 60 Hz in the short magnetar burst SGR 150228213, with a confidence level of 3.35 & sigma;. This burst was initially attributed to 4U 0142+61 by Fermi/GBM on location, but we have not detected such QPOs in other bursts from this magnetar. We also found that there was a repeating fast radio burst associated with SGR 150228213 on location. Finally, we discuss the possible origins of SGR 150228213.

Automated summary

The detection of quasi-periodic oscillations (QPOs) in magnetar giant flares (GFs) has provided new insights into understanding the mechanism of magnetar bursts. In this study, we report the detection of a narrow QPO at approximately 110 Hz and a wide QPO at approximately 60 Hz in the short magnetar burst SGR 150228213, with a confidence level of 3.35σ. Although this burst was initially attributed to 4U 0142+61, we have not observed such QPOs in other bursts from this magnetar. Additionally, we found a repeating fast radio burst associated with SGR 150228213 on location.