Observation of 36 non-repeating fast radio burst candidates using the FAST telescope detected no bursts, establishing stringent upper limits on repetition rates.
The study provides stringent upper limits on the repetition rates of 36 previously classified non-repeating fast radio bursts using the FAST telescope.
ABSTRACT 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, this classification is complicated by limited observing time and sensitivity constraints, which may result in some repeating FRBs being misidentified as non-repeating. To address this issue, we adopt both empirical and machine-learning techniques from previous studies to identify candidates that may have been misclassified. We conducted follow-up observations of 36 such candidates, each observed for 10 min using the Five-hundred-meter Aperture Spherical Telescope (FAST). No radio bursts exceeding a signal-to-noise ratio of 7 were detected, with a typical 7 fluence limit of 0. 013 Jy ms. We constrain the repetition rates of these sources using two statistical models of FRB occurrence. Combining our FAST non-detections with prior observations, we derive upper limits on the repetition rates of 10^-2. 6–10^-0. 22 h^-1 under a Poisson process, and 10^-2. 3–10^-0. 25 h^-1 under a Weibull process. This work presents one of the most stringent upper limits on FRB repetition rates to date, based on a sample size five times larger than those used in previous studies.
Uno et al. (Thu,) conducted a other in Fast Radio Bursts (n=36). FAST telescope observation was evaluated on Detection of radio bursts exceeding a signal-to-noise ratio of 7. Observation of 36 non-repeating fast radio burst candidates using the FAST telescope detected no bursts, establishing stringent upper limits on repetition rates.