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arXiv · 2211.13835

Detection of a bright burst from the repeating FRB 20201124A at 2 GHz

Sota Ikebe·Kazuhiro Takefuji·Toshio Terasawa·Sujin Eie·Takuya Akahori·Yasuhiro Murata·Tetsuya Hashimoto·Shota Kisaka·Mareki Honma·Shintaro Yoshiura·Syunsaku Suzuki·Tomoaki Oyama·Mamoru Sekido·Kotaro Niinuma·Hiroshi Takeuchi·Yoshinori Yonekura·Teruaki Enoto
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Abstract

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.

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Sota Ikebe, Kazuhiro Takefuji, Toshio Terasawa, Sujin Eie, Takuya Akahori, Yasuhiro Murata, Tetsuya Hashimoto, Shota Kisaka, Mareki Honma, Shintaro Yoshiura, Syunsaku Suzuki, Tomoaki Oyama, Mamoru Sekido, Kotaro Niinuma, Hiroshi Takeuchi, Yoshinori Yonekura, Teruaki Enoto. 2022-11-25. Detection of a bright burst from the repeating FRB 20201124A at 2 GHz. https://doi.org/10.1093/pasj%2Fpsac101

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