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A sudden period of high activity from repeating fast radio burst 20201124A

From National Research Council Canada

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DOIResolve DOI: https://doi.org/10.3847/1538-4357/ac4bc7
AuthorSearch for: ORCID identifier: https://orcid.org/0000-0003-2116-3573; Search for: ORCID identifier: https://orcid.org/0000-0001-5908-3152; Search for: ORCID identifier: https://orcid.org/0000-0002-3426-7606; Search for: ORCID identifier: https://orcid.org/0000-0003-3059-6223; Search for: ORCID identifier: https://orcid.org/0000-0001-9345-0307; Search for: ; Search for: ORCID identifier: https://orcid.org/0000-0003-3772-2798; Search for: ORCID identifier: https://orcid.org/0000-0002-3615-3514; Search for: ORCID identifier: https://orcid.org/0000-0001-8537-9299; Search for: ORCID identifier: https://orcid.org/0000-0002-1800-8233; Search for: ORCID identifier: https://orcid.org/0000-0002-2349-3341; Search for: ORCID identifier: https://orcid.org/0000-0003-2047-5276; Search for: ORCID identifier: https://orcid.org/0000-0003-4098-5222; Search for: ORCID identifier: https://orcid.org/0000-0001-8384-5049; Search for: ORCID identifier: https://orcid.org/0000-0002-3382-9558; Search for: ORCID identifier: https://orcid.org/0000-0003-1884-348X; Search for: 1ORCID identifier: https://orcid.org/0000-0003-4810-7803; Search for: ORCID identifier: https://orcid.org/0000-0002-4209-7408; Search for: ORCID identifier: https://orcid.org/0000-0002-4279-6946; Search for: ORCID identifier: https://orcid.org/0000-0001-8845-1225; Search for: ORCID identifier: https://orcid.org/0000-0002-3616-5160; Search for: ORCID identifier: https://orcid.org/0000-0003-3367-1073; Search for: ORCID identifier: https://orcid.org/0000-0002-8912-0732; Search for: ORCID identifier: https://orcid.org/0000-0002-9822-8008; Search for: ORCID identifier: https://orcid.org/0000-0002-4795-697X; Search for: ORCID identifier: https://orcid.org/0000-0001-7694-6650; Search for: ORCID identifier: https://orcid.org/0000-0003-1842-6096; Search for: ORCID identifier: https://orcid.org/0000-0001-5504-229X; Search for: ORCID identifier: https://orcid.org/0000-0002-7374-7119; Search for: ORCID identifier: https://orcid.org/0000-0002-6823-2073; Search for: ORCID identifier: https://orcid.org/0000-0001-9784-8670; Search for: ORCID identifier: https://orcid.org/0000-0003-2548-2926; Search for: ORCID identifier: https://orcid.org/0000-0001-8278-1936
Affiliation
  1. National Research Council of Canada. Herzberg Astronomy and Astrophysics
FunderSearch for: Natural Sciences and Engineering Research Council of Canada; Search for: National Science Foundation; Search for: Gordon and Betty Moore Foundation
FormatText, Article
Subjectradio bursts; radio transient sources
Abstract
The repeating FRB 20201124A was first discovered by CHIME/FRB in November of 2020, after which it was seen to repeat a few times over several months. It entered a period of high activity in April of 2021, at which time several observatories recorded tens to hundreds more bursts from the source. These follow-up observations enabled precise localization and host-galaxy identification. In this paper, we report on the CHIME/FRB-detected bursts from FRB 20201124A, including their best-fit morphologies, fluences, and arrival times. The large exposure time of the CHIME/FRB telescope toward the location of this source allows us to constrain its rates of activity. We analyze the repetition rates over different spans of time, constraining the rate prior to discovery to <3.4 day⁻¹ (at 3σ), and demonstrate a significant change in the event rate following initial detection. Lastly, we perform a maximum-likelihood estimation of a power-law luminosity function, finding a best-fit index α = −4.6 ± 1.3 ± 0.6, with a break at a fluence threshold of Fₘᵢₙ ~ 16.6 Jy ms, consistent with the fluence completeness limit of the observations. This index is consistent within uncertainties with those of other repeating FRBs for which it has been determined.
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  • The Astrophysical Journal 927, no. 1, 59 (4 March 2022).
LanguageEnglish
Peer reviewedYes
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Record identifierf383778c-854b-454c-bbac-f5fb1665ca09
Record created2023-09-21
Record modified2023-09-21
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