Table 2.
Log of the observations of Gaia BH3 (LS II +14 13) and the interferometric calibrator (BD+08 4132) with GRAVITY.
| Starting UT date | MJD | Target | Cal/ | Obj/ | Exp. | Instrumental setup | AM | σ | τ0 |
|---|---|---|---|---|---|---|---|---|---|
| −60000 | Sci | Sky | (s) | (Res, Pol, Mode) | (″) | (ms) | |||
| 2024-06-03T08:09:17 | 464.3400 | LS II +14 13 | Sci | (OSOO) | 389 | Med, Split, Single | 1.32 | 0.51 | 3.5 |
| 2024-06-03T08:49:05 | 464.3678 | BD+08 4132 | Cal | (SO) | 389 | Med, Split, Single | 1.31 | 0.29 | 2.6 |
| 2024-06-23T07:33:20 | 484.3150 | LS II +14 13 | Sci | OSOO | 376 | Med, Comb, Single | 1.41 | 0.54 | 2.3 |
| 2024-06-23T08:10:10 | 484.3406 | BD+08 4132 | Cal | SO | 376 | Med, Comb, Single | 1.41 | 0.73 | 2.3 |
| 2024-06-23T08:30:14 | 484.3545 | LS II +14 13 | Sci | (O)SOOO | 414 | High, Comb., Single | 1.61 | 0.58 | 2.3 |
| 2024-06-23T09:14:18 | 484.3851 | BD+08 4132 | Cal | OS | 414 | High, Comb, Single | 1.81 | 0.78 | 2.3 |
| 2024-07-18T06:16:05 | 509.2614 | LS II +14 13 | Sci | OSOO | 376 | Med, Comb, Dual | 1.45 | 0.32 | 7.5 |
| 2024-07-18T06:52:52 | 509.2868 | BD+08 4132 | Cal | OS | 376 | Med, Comb, Single | 1.51 | 0.49 | 5.4 |
Notes. The listed exposure time “Exp.” is the shutter-open time for one object (O) or sky (S) series. The data files in parentheses are affected by instrumental problems (see Sect. 2 and App. A). The instrumental setup includes the spectral resolution (medium or high), the polarization (split or combined), and the field configuration (single or dual). The term “AM” refers to the airmass, σ to the DIMM seeing, and τ0 to the coherence time.
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