We present a detection of a bright burst from FRB 20201124A, which is one of the most active repeating FRBs, based on S-band observations with the 64-m radio telescope at the Usuda Deep Space Center/JAXA. This is the first FRB observed by using a Japanese facility. Our detection at 2 GHz in February 2022 is the highest frequency for this FRB and the fluence of > 189 Jy ms is one of the brightest bursts from this FRB source. We place an upper limit on the spectral index α = -2.14 from the detection of the S band and non-detection of the X band at the same time. We compare an event rate of the detected burst with ones of the previous research, and suggest that the power-law of the luminosity function might be broken at lower fluence, and the fluences of bright FRBs distribute up to over 2 GHz with the power-law against frequency. In addition, we show the energy density of the burst detected in this work was comparable to the bright population of one-off FRBs. We propose that repeating FRBs can be as bright as one-off FRBs, and only their brightest bursts could be detected so some of repeating FRBs intrinsically might have been classified as one-off FRBs.
@article{arxiv.2211.13835,
title = {Detection of a bright burst from the repeating FRB 20201124A at 2 GHz},
author = {Sota Ikebe and Kazuhiro Takefuji and Toshio Terasawa and Sujin Eie and Takuya Akahori and Yasuhiro Murata and Tetsuya Hashimoto and Shota Kisaka and Mareki Honma and Shintaro Yoshiura and Syunsaku Suzuki and Tomoaki Oyama and Mamoru Sekido and Kotaro Niinuma and Hiroshi Takeuchi and Yoshinori Yonekura and Teruaki Enoto},
journal= {arXiv preprint arXiv:2211.13835},
year = {2023}
}
Comments
8 pages, 5 figures, accepted for publication in Publications of the Astronomical Society of Japan (PASJ)