Open Access
Table 1.
Summary of IMACS and GMOS-S observations used in this work. All data were acquired during the night of 25 November 2019 for both IMACS observations and nights of 16/23/27 September 2017 for W2246–0526 GMOS-S observations (2023Zewdie).
| Field | Instrument | Filters | Total exposure | Mean | Mean | Depth of the stack image |
|---|---|---|---|---|---|---|
| time | seeing | airmass | 5 σ /3 σ /1 σ | |||
| g | 4900 s | 1.02″ | 1.15 | 26.70/27.25/28.43 | ||
| W0410−0913 | IMACS | r | 2100 s | 1.07″ | 1.08 | 25.83/26.39/27.56 |
| i | 1600 s | 1.08″ | 1.07 | 25.13/25.69/26.88 | ||
| g | 3600 s | 1.1″ | 1.30 | 26.42/26.96/28.10 | ||
| W0831+0140 | IMACS | r | 1850 s | 0.81″ | 1.17 | 25.47/26.02/27.18 |
| i | 1200 s | 1.01″ | 1.54 | 25.08/25.63/26.83 | ||
| r | 7500 s | 0.58″ | 1.1 | 27.29/27.84/29.00 | ||
| W2246–0526 | GMOS-S | i | 7200 s | 0.81″ | 1.3 | 26.58/27.16/28.34 |
| z | 6200 s | 1.01″ | 1.2 | 26.02/26.57/27.77 | ||
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