TY - JOUR
T1 - A Sudden Period of High Activity from Repeating Fast Radio Burst 20201124A
AU - Lanman, Adam E.
AU - Andersen, Bridget C.
AU - Chawla, Pragya
AU - Josephy, Alexander
AU - Noble, Gavin
AU - Kaspi, Victoria M.
AU - Bandura, Kevin
AU - Bhardwaj, Mohit
AU - Boyle, P. J.
AU - Brar, Charanjot
AU - Breitman, Daniela
AU - Cassanelli, Tomas
AU - Dong, Fengqiu
AU - Fonseca, Emmanuel
AU - Gaensler, B. M.
AU - Good, Deborah
AU - Kaczmarek, Jane
AU - Leung, Calvin
AU - Masui, Kiyoshi W.
AU - Meyers, B. W.
AU - Ng, Cherry
AU - Patel, Chitrang
AU - Pearlman, Aaron B.
AU - Petroff, Emily
AU - Pleunis, Ziggy
AU - Rafiei-Ravandi, Masoud
AU - Rahman, Mubdi
AU - Sanghavi, Pranav
AU - Scholz, Paul
AU - Shin, Kaitlyn
AU - Stairs, Ingrid
AU - Tendulkar, Shriharsh
AU - Zwaniga, Andrew
N1 - Publisher Copyright:
© 2022. The Author(s). Published by the American Astronomical Society.
PY - 2022/3/1
Y1 - 2022/3/1
N2 - 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.
AB - 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.
UR - https://www.scopus.com/pages/publications/85126824524
U2 - 10.3847/1538-4357/ac4bc7
DO - 10.3847/1538-4357/ac4bc7
M3 - Article
AN - SCOPUS:85126824524
SN - 0004-637X
VL - 927
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 1
M1 - 59
ER -