Table 1.
Observing log and corresponding X-ray state.
| Epoch | 2016 date (MJD) | Accretion state | Grism (a) and exposures | g-band magnitude (# of observations) |
|---|---|---|---|---|
| 1 | 03 Aug (57603) | Intermediate | R1 (1 × 300s) + R2 (6 × 700s) | 17.80 ± 0.02 (2) |
| 2 | 05 Aug (57605) | Soft | R1 (1 × 300s) + R2 (8 × 600s) | 16.66 ± 0.02 |
| 3 | 06 Aug (57606) | Soft | R1 (1 × 300s) + R2 (2 × 600s) | 16.72 ± 0.02 |
| 4 | 07 Aug (57607) | Soft | R1 (1 × 300s) + R2 (2 × 600s) | 16.49 ± 0.02 |
| 5 | 08 Aug (57608) | Soft | R1 (1 × 300s) + R2 (2 × 600s) | 16.50 ± 0.02 |
| 6 | 11 Aug (57611) | Soft | R1 (1 × 300s) + R2 (2 × 600s) | 16.08 ± 0.02 (2) |
| 7 | 13 Aug (57613) | Soft | R1 (2 × 300s) + R2 (2 × 600s) | 16.54 ± 0.04 (6) |
| 8 | 18 Aug (57618) | Soft | R1 (2 × 150s) + R2 (4 × 300s) | 16.65 ± 0.02 |
| 9 | 21 Aug (57621) | Soft | R1 (1 × 300s) + R2 (2 × 600s) | 16.181 ± 0.004 (*) |
| 10 | 24 Aug (57624) | Soft | R1 (1 × 300s) + R2 (2 × 600s) | 16.48 ± 0.02 (3) |
| 11 | 27 Aug (57627) | Soft | R1 (1 × 300s) + R2 (2 × 600s) | 16.53 ± 0.02 (3) |
| 12 | 29 Aug (57629) | Soft | R1 (1 × 300s) + R2 (3 × 685s) | 16.51 ± 0.02 (3) |
| 13 | 20 Sep (57651) | Intermediate | R1 (2 × 400s) | 18.90 ± 0.02 |
| 14 | 30 Sep (57661) | Hard | R1 (2 × 400s) | 19.82 ± 0.03 (**) (2) |
Notes.
The acquisition image in this night was obtained in the r-band, so we report this value instead.
Aql X-1 has an interloper star at ∼0.5″ (Chevalier et al. 1997; Mata Sánchez et al. 2017). This magnitude is consistent with a significant contribution from the interloper to the optical spectrum (see Sect. 2.2).
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