A Sudden Period of High Activity from Repeating Fast Radio Burst 20201124A
<jats:title>Abstract</jats:title> <jats:p>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 sever...
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| Format: | Article |
| Language: | English |
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American Astronomical Society
2022
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| Online Access: | https://hdl.handle.net/1721.1/142152 |
| _version_ | 1811071534235648000 |
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| author | Masui, Kiyoshi |
| author2 | MIT Kavli Institute for Astrophysics and Space Research |
| author_facet | MIT Kavli Institute for Astrophysics and Space Research Masui, Kiyoshi |
| author_sort | Masui, Kiyoshi |
| collection | MIT |
| description | <jats:title>Abstract</jats:title>
<jats:p>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<jats:sup>−1</jats:sup> (at 3<jats:italic>σ</jats:italic>), 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 <jats:italic>α</jats:italic> = −4.6 ± 1.3 ± 0.6, with a break at a fluence threshold of <jats:inline-formula>
<jats:tex-math>
<?CDATA ${F}_{\min }\sim 16.6$?>
</jats:tex-math>
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
<mml:msub>
<mml:mrow>
<mml:mi>F</mml:mi>
</mml:mrow>
<mml:mrow>
<mml:mi>min</mml:mi>
</mml:mrow>
</mml:msub>
<mml:mo>∼</mml:mo>
<mml:mn>16.6</mml:mn>
</mml:math>
<jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="apjac4bc7ieqn1.gif" xlink:type="simple" />
</jats:inline-formula> 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.</jats:p> |
| first_indexed | 2024-09-23T08:52:42Z |
| format | Article |
| id | mit-1721.1/142152 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T08:52:42Z |
| publishDate | 2022 |
| publisher | American Astronomical Society |
| record_format | dspace |
| spelling | mit-1721.1/1421522023-04-19T20:10:17Z A Sudden Period of High Activity from Repeating Fast Radio Burst 20201124A Masui, Kiyoshi MIT Kavli Institute for Astrophysics and Space Research Massachusetts Institute of Technology. Department of Physics <jats:title>Abstract</jats:title> <jats:p>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<jats:sup>−1</jats:sup> (at 3<jats:italic>σ</jats:italic>), 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 <jats:italic>α</jats:italic> = −4.6 ± 1.3 ± 0.6, with a break at a fluence threshold of <jats:inline-formula> <jats:tex-math> <?CDATA ${F}_{\min }\sim 16.6$?> </jats:tex-math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msub> <mml:mrow> <mml:mi>F</mml:mi> </mml:mrow> <mml:mrow> <mml:mi>min</mml:mi> </mml:mrow> </mml:msub> <mml:mo>∼</mml:mo> <mml:mn>16.6</mml:mn> </mml:math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="apjac4bc7ieqn1.gif" xlink:type="simple" /> </jats:inline-formula> 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.</jats:p> 2022-04-27T17:46:27Z 2022-04-27T17:46:27Z 2022-03-01 2022-04-27T17:41:19Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/142152 Masui, Kiyoshi. 2022. "A Sudden Period of High Activity from Repeating Fast Radio Burst 20201124A." The Astrophysical Journal, 927 (1). en 10.3847/1538-4357/ac4bc7 The Astrophysical Journal Creative Commons Attribution 4.0 International license https://creativecommons.org/licenses/by/4.0/ application/pdf American Astronomical Society The American Astronomical Society |
| spellingShingle | Masui, Kiyoshi A Sudden Period of High Activity from Repeating Fast Radio Burst 20201124A |
| title | A Sudden Period of High Activity from Repeating Fast Radio Burst 20201124A |
| title_full | A Sudden Period of High Activity from Repeating Fast Radio Burst 20201124A |
| title_fullStr | A Sudden Period of High Activity from Repeating Fast Radio Burst 20201124A |
| title_full_unstemmed | A Sudden Period of High Activity from Repeating Fast Radio Burst 20201124A |
| title_short | A Sudden Period of High Activity from Repeating Fast Radio Burst 20201124A |
| title_sort | sudden period of high activity from repeating fast radio burst 20201124a |
| url | https://hdl.handle.net/1721.1/142152 |
| work_keys_str_mv | AT masuikiyoshi asuddenperiodofhighactivityfromrepeatingfastradioburst20201124a AT masuikiyoshi suddenperiodofhighactivityfromrepeatingfastradioburst20201124a |