Extended Data Table 2 X-ray observations of FRB 20200120E
- Radio bursts were detected from FRB 20200120E during the observations highlighted in bold. FRB 20200120E was observed with NICER for a total exposure time of 109.4 ks between 15 February 2021 and 30 May 2021. The total exposure times of the Chandra, NuSTAR, and XMM-Newton observations of FRB 20200120E were 80.5 ks, 45.7 ks, and 40.0 ks, respectively. aStart time of the observation. bEnd time of the observation. cMid-time of the observation. dTotal exposure time during Good Time Intervals (GTIs). eAverage (non-background-subtracted) count rate during GTIs. The count rates are derived in the 0.5–10 keV energy band for the Chandra, NICER, and XMM-Newton observations and in the 3–79 keV energy band for the NuSTAR observations. A circular region around the source, centred on the position of FRB 20200120E from VLBI17, was used to measure the count rates for the Chandra, NuSTAR, and XMM-Newton observations. fOff-axis angle, calculated relative to the nominal pointing direction and the VLBI position of FRB 20200120E17. g3σ persistent X-ray flux upper limits are derived in the 0.5–10 keV energy band for the Chandra, NICER, and XMM-Newton observations and in the 3–79 keV energy band for the NuSTAR observations. A fiducial absorbed power-law spectral model, with NH = 6.73 × 1020 cm−2 (ref. 24) and Γ = 2, was used to calculate the persistent X-ray flux upper limits. hTotal exposure time after removal of instrumental flares. iThe higher count rate compared to other NICER observations was due to higher background, as indicated by larger housekeeping parameter (FPM_OVERONLY_COUNT) values.
