Poster Presentation

Do they repeat? Monitoring 36 non-repeating FRBs with FAST

Author(s): Yuri Uno (NCHU), Tetsuya Hashimoto (NCHU), T. Goto (NTHU), S. Hisano (Kumamnoto Univ.), Y. H. V. Wong (CU Boulder), A. Chen (NTHU), S. Eie(IAAAS), S. C.-C. Ho (ANU), J. Chibueze (UNISA), Y-W Lin (NTHU), S. J. Kim (NTHU), T-Y Hsu(NTHU), P. Wang(NTHU)

Presenter: Yuri Uno (National Chung Hsing University/NCHU)

Fast Radio Bursts (FRBs) are intense, brief flashes of radio emission originating from distant parts of the universe, whose origins remain enigmatic. These bursts are categorized into two types: non-repeating and repeating. Accurate classification is crucial for understanding their nature but is hindered by observational challenges such as limited time windows and sensitivity. These limitations often result in the potential misclassification of repeating FRBs as non-repeating events. To tackle these challenges, we conducted a follow-up observation campaign using the Five-hundred-meter Aperture Spherical Telescope (FAST) for 36 potential repeating FRBs, which were selected using machine-learning and empirical methods from previous studies. These methods aim to identify repeating candidates among FRBs previously classified as non-repeating. Although no significant signals were detected with a signal-to-noise ratio greater than 7, our efforts have enabled us to establish stringent upper limits on the repeating rate of our samples. The typical upper limit imposed by our FAST observations is approximately 10^-1.3 hr^-1, representing a constraint about two times more stringent than those imposed by previous CHIME observations.