Table 2.
Logbook of the observations.
| (1) | (2) | (3) | (4) | (5) | (6) | (7) |
|---|---|---|---|---|---|---|
| 3FHL name | Date | N | Exp. | FWHM | Airmass | Ap |
| (s) | (arcsec) | range | mag | |||
| J0045.3+2127 | 2019-08-30 | 20 | 2900 | 0.59 | 1.01–1.07 | 16.57 |
| J0148.2+5201 | 2019-08-30 | 10 | 1900 | 0.69 | 1.09–1.11 | 16.92 |
| J0905.5+1357 | 2019-03-02, 2019-03-01 | 27 | 4680 | 0.70 | 1.03–1.07 | 16.35 |
| J0915.9+2933 | 2018-01-10 | 81 | 2430 | 0.74 | 1.05–1.20 | 15.40 |
| J1150.5+4154 | 2019-03-01, 2019-05-06 | 43 | 5130 | 0.76 | 1.04–1.06 | 16.04 |
| J1546.1+0818 | 2019-05-07, 2019-06-17 | 36 | 3600 | 0.69 | 1.06–1.08 | 16.64 |
| J1555.7+1111 | 2019-05-06, 2019-06-17 | 63 | 315 | 0.67 | 1.06–1.15 | 12.94 |
| J1811.3+0341 | 2019-08-29 | 7 | 2900 | 0.90 | 1.10–1.13 | 16.25 |
| J1844.4+1546 | 2019-08-29 | 10 | 2250 | 0.86 | 1.08–1.16 | 16.46 |
| J1931.1+0937 | 2016-10-01 | 10 | 2000 | 0.78 | 1.20–1.34 | 16.14 |
| J1933.3+0726 | 2017-06-19 | 12 | 2400 | 0.57 | 1.07–1.09 | 16.58 |
| J1942.7+1033 | 2016-10-09 | 12 | 1400 | 0.51 | 1.32–1.51 | 15.61 |
| J2031.0+1936 | 2019-05-07, 2019-06-20 | 16 | 3200 | 0.72 | 1.04–1.21 | 17.24 |
| J2156.0+1818 | 2019-08-30 | 20 | 2850 | 0.70 | 1.02–1.05 | 16.79 |
| J2245.9+1545 | 2019-08-30 | 6 | 3000 | 0.74 | 1.02–1.03 | 18.15 |
| J2247.9+4413 | 2017-07-26 | 12 | 2400 | 0.59 | 1.29–1.48 | 16.93 |
| J2304.7+3705 | 2017-08-11 | 12 | 2400 | 1.00 | 1.01–1.03 | 17.17 |
Notes. Columns: (1) source name in 3FHL catalogue, (2) date(s) of observation, (3) number of images combined, (4) total exposure time in seconds, (5) seeing (full width at half maximum) in arcsec calculated by fitting a Gaussian profile to a star close to the target, (6) airmass range during the exposures and (7) I-band magnitude through a 5 arcsec diameter aperture. The error is 0.02 mag.
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