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Table 1
Journal of observations and main characteristics of the quasars.
| Name | JD(start) | Exposure | Airmass | Seeing |
| −2 400 000 | time (s) | (start) | (′′) | |
|
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| SDSS J14472+0401, z = 4.580, R(AB) = 19.9 ± 0.2, MR = −28.2 | ||||
|
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| 54 647.617 | 1300 | 1.30 | 0.54 | |
| 54 647.633 | 1300 | 1.38 | 0.57 | |
| 54 653.565 | 1300 | 1.18 | 0.61 | |
| 54 653.581 | 1300 | 1.22 | 0.60 | |
| 54 654.562 | 1300 | 1.18 | 0.85 | |
| 54 654.577 | 1300 | 1.22 | 0.88 | |
| 54 654.600 | 1300 | 1.31 | 0.89 | |
| 54 654.615 | 1300 | 1.39 | 0.90 | |
|
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| SDSS J21474-0838, z = 4.588, R(AB) = 18.7 ± 0.2, MR = −29.3 | ||||
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| 54 645.875 | 1300 | 1.07 | 1.04 | |
| 54 645.891 | 1300 | 1.10 | 0.99 | |
| 54 647.700 | 1300 | 1.48 | 0.93 | |
| 54 647.715 | 1300 | 1.35 | 0.90 | |
| 54 647.736 | 1300 | 1.23 | 0.69 | |
| 54 647.752 | 1300 | 1.17 | 0.91 | |
| 54 647.772 | 1300 | 1.11 | 0.55 | |
| 54 647.787 | 1300 | 1.08 | 0.57 | |
|
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| BR 2237-0607, z = 4.550, R(AB) = 18.3 ± 0.2, MR = −29.8 | ||||
|
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| 54 653.750 | 1300 | 1.29 | 0.69 | |
| 54 653.766 | 1300 | 1.21 | 0.68 | |
| 54 653.790 | 1300 | 1.13 | 1.02 | |
| 54 654.716 | 1300 | 1.52 | 0.97 | |
| 54 654.732 | 1300 | 1.39 | 1.14 | |
| 54 654.751 | 1300 | 1.27 | 1.26 | |
| 54 654.767 | 1300 | 1.20 | 1.18 | |
| 54 656.803 | 1300 | 1.09 | 0.82 | |
| 54 656.818 | 1300 | 1.07 | 0.91 | |
Notes. The apparent magnitudes are given in the AB system. They are computed by integrating the quasar’s spectrum through the RSPECIAL ESO filter curve. The absolute magnitude assumes H0 = 72 km s-1 Mpc-1 and (Ωm,ΩΛ) = (0.3,0.7).
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