A sudden period of high activity from repeating Fast Radio Burst 20201124A
astro-ph.HE
/ Authors
Adam E. Lanman, Bridget C. Andersen, Pragya Chawla, Alexander Josephy, Gavin Noble, Victoria M. Kaspi, Kevin Bandura, Mohit Bhardwaj, Patrick J. Boyle, Charanjot Brar
and 23 more authors
Daniela Breitman, Tomas Cassanelli, Fengqi Dong, Emmanuel Fonseca, Bryan M. Gaensler, Deborah Good, Jane Kaczmarek, Calvin Leung, Kiyoshi W. Masui, Bradley W. Meyers, Cherry Ng, Chitrang Patel, Aaron B. Pearlman, Emily Petroff, Ziggy Pleunis, Masoud Rafiei-Ravandi, Mubdi Rahman, Pranav Sanghavi, Paul Scholz, Kaitlyn Shin, Ingrid Stairs, Shriharsh Tendulkar, Andrew Zwaniga
/ 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 to 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 3$σ$), and demonstrate 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 $α= -4.6 \pm 1.3 \pm 0.6$, with a break at a fluence threshold of $F_{\rm min} \sim 16.6$~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.