Kavli Affiliate: Kiyoshi W. Masui
| First 5 Authors: Hsiu-Hsien Lin, Paul Scholz, Cherry Ng, Ue-Li Pen, Mohit Bhardwaj
| Summary:
We report ten fast radio bursts (FRBs) detected in the far side-lobe region
(i.e., $geq 5^circ$ off-meridian) of the Canadian Hydrogen Intensity Mapping
Experiment (CHIME) from 2018 August 28 to 2021 August 31. We localize the
bursts by fitting their spectra with a model of the CHIME/FRB synthesized beam
response. CHIME/FRB did not observe repetition of similar brightness from the
uniform sample of 10 side-lobe FRBs in a total exposure time of 35580 hours.
Under the assumption of Poisson-distributed bursts, we infer that the mean
repetition interval above the detecting threshold of the far side-lobe events
is longer than 11880 hours, which is at least 2380 times larger than the
interval from known CHIME/FRB detected repeating sources, with some caveats,
notably that very narrow-band events could have been missed. Our results from
these far side-lobe events suggest one of two scenarios: either (1) all FRBs
repeat and the repetition intervals span a wide range, with high-rate repeaters
being a rare subpopulation, or (2) non-repeating FRBs are a distinct population
different from known repeaters.
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