Do they repeat? Monitoring 36 non-repeating FRBs with FAST
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| Autori principali: | , , , , , , , , , , , , , , |
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| Natura: | Preprint |
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2025
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| author | Uno, Yuri Hashimoto, Tetsuya Goto, Tomotsugu Hisano, Shinnosuke Wong, Yi Hang Valerie Chen, Arthur Eie, Sujin Ho, Simon C. -C. Chibueze, James O. Lin, Yu-Wei Kim, Seong Jin Hsu, Tzu-Yin Wang, Poya Wang, Pei Aznam, Murthadza |
| author_facet | Uno, Yuri Hashimoto, Tetsuya Goto, Tomotsugu Hisano, Shinnosuke Wong, Yi Hang Valerie Chen, Arthur Eie, Sujin Ho, Simon C. -C. Chibueze, James O. Lin, Yu-Wei Kim, Seong Jin Hsu, Tzu-Yin Wang, Poya Wang, Pei Aznam, Murthadza |
| contents | 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 minutes 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 sigma 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 ~$10^{-2.6}$-$10^{-0.22}$ hr$^{-1}$ under a Poisson process, and ~$10^{-2.3}$-$10^{-0.25}$ hr$^{-1}$ 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_03564 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Do they repeat? Monitoring 36 non-repeating FRBs with FAST Uno, Yuri Hashimoto, Tetsuya Goto, Tomotsugu Hisano, Shinnosuke Wong, Yi Hang Valerie Chen, Arthur Eie, Sujin Ho, Simon C. -C. Chibueze, James O. Lin, Yu-Wei Kim, Seong Jin Hsu, Tzu-Yin Wang, Poya Wang, Pei Aznam, Murthadza High Energy Astrophysical Phenomena 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 minutes 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 sigma 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 ~$10^{-2.6}$-$10^{-0.22}$ hr$^{-1}$ under a Poisson process, and ~$10^{-2.3}$-$10^{-0.25}$ hr$^{-1}$ 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. |
| title | Do they repeat? Monitoring 36 non-repeating FRBs with FAST |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2506.03564 |