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Table 1

Long-term radio monitoring of J1019+65 using LOFAR between 120 and 168 MHz.

Start of epoch (UTC) Exposure time (hours) σ̄V,4min (μJy)
2021-02-23T19:01:20.0 8 476
2022-12-01T03:06:00.0 4 542
2023-01-15T00:11:00.0 4 658
2023-01-24T21:41:00.0 4 556
2023-02-12T21:41:00.0 4 568
2023-02-14T22:11:00.0 4 572
2023-03-05T20:11:00.0 4 746
2023-03-08T18:11:00.0 4 698
2023-03-11T23:11:00.0 4 833
2023-03-20T20:11:00.0 4 616

Notes. σv,4min represents the local root-mean-square RMS noise around J1019+65 averaged across all Stokes V 4 min-cadence images (each synthesised over the full bandwidth). The date and time formats follow ISO 8601. The exposure time includes overheads.

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