Oral Presentation

Do They Repeat? Constraining the Repetition of Candidate Non-Repeating FRBs with FAST

Author(s):

Presenter: Yuri Uno (NCHU)

The origin of fast radio bursts (FRBs), highly energetic, millisecond-duration radio pulses originating from beyond our galaxy, remains unknown. Observationally, FRBs are classified as non-repeating or repeating, however, distinguishing between them is challenging due to limited observation time and sensitivity constraints, which may lead to the misclassification of some repeating FRBs as non-repeating. To address this issue, we apply both empirical and machine-learning methods from previous studies to identify potentially misclassified repeating FRBs. We conducted a follow-up observation campaign targeting 36 such candidates, each observed for 10 minutes with the Five-hundred-meter Aperture Spherical Telescope (FAST). Since the DMs of all targets are known, we searched for repeating bursts with a signal-to-noise ratio (SNR) > 7. No such bursts were detected, with a typical 7