Table A.1.
Optical fast timing observations.
| Night | Telescope ID | Start (MJD) | Stop (MJD) | Tobs (s) | Count rate (ct/s) | Frac. RMS (%) | Ref. Frac. RMS (%) |
|---|---|---|---|---|---|---|---|
| 2018-04-18 | Iqueye at Galileo | 58226.987512 | 58227.144271 | 3582 | 8694.0 | 8.05 | 3.66 |
| 2018-05-21* | Iqueye at Galileo | 58259.963819 | 58260.073970 | 1186 | 920.0 | 5.01 | / |
| 2018-06-08 | Iqueye at Galileo | 58277.880174 | 58278.072153 | 4483 | 2732.0 | 4.24 | 2.78 |
| 2018-07-18 | Iqueye at Galileo | 58317.857575 | 58318.008258 | 6292 | 3118.0 | 4.89 | 4.39 |
| Aqueye+ at Copernicus | 58317.860313 | 58318.079815 | 8080 | 39838.0 | 2.67 | 2.51 | |
| 2018-07-19 | Iqueye at Galileo | 58318.905007 | 58319.067042 | 7192 | 2334.0 | 2.74 | 4.97 |
| 2018-07-23 | Aqueye+ at Copernicus | 58322.888808 | 58323.017569 | 5388 | 35768.0 | 4.79 | 3.78 |
| 2018-07-28 | Iqueye at Galileo | 58327.868617 | 58327.946255 | 2181 | 4014.0 | 2.67 | 1.6 |
| 2018-10-13 | Iqueye at Galileo | 58404.735278 | 58404.853843 | 5384 | 1125.0 | 4.68 | 3.87 |
| *Bad weather. Reference star not observed. | |||||||
Notes. A typical observing sequence is composed of 1 minute on sky, 15 or 30 minutes on target, and 5 minutes on a reference star. This is repeated several times. The last observation is 1 minute on sky. Since a typical sequence starts and finishes with a sky observation, the start and stop times in the table refer to them rather than to the start/stop time of the observations of the target. However, Tobs refers to the time on target, considering only the time with the best sky conditions. The reported count rate is the background-subtracted average rate. In the last column are reported the fractional RMS of a reference star (GSC 00444-02282) in the vicinity of MAXI J1820+070.
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