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Table 3.
Photometric measurements of the GRB 210312B host galaxy and its companion 
south of the afterglow position.
| exp. mid | filter | Texp. [s] | mag | telescope [m] |
|---|---|---|---|---|
| The nothern underlying object (host galaxy) | ||||
| 52.2976 | g | 10 × 120 | 23.96 ± 0.17 | LBT 8.4 |
| 52.2976 | r | 10 × 120 | 23.64 ± 0.13 | LBT 8.4 |
| 52.3216 | i | 10 × 120 | 23.16 ± 0.18 | LBT 8.4 |
| 52.3216 | z | 10 × 120 | 22.58 ± 0.16 | LBT 8.4 |
| The southern underlying object (host companion) | ||||
| 52.2976 | g | 10 × 120 | 24.07 ± 0.18 | LBT 8.4 |
| 52.2976 | r | 10 × 120 | 23.83 ± 0.13 | LBT 8.4 |
| 52.3216 | i | 10 × 120 | 23.26 ± 0.20 | LBT 8.4 |
| 52.3216 | z | 10 × 120 | 22.91 ± 0.21 | LBT 8.4 |
Notes. Magnitudes are not corrected for Galactic extinction. As above, the values are given in their native systems: Pan-STARRS griz magnitudes are AB, BVRCNIC are in Vega.
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