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Table 1.

Spectroscopic epochs and X-ray and radio properties.

Epoch MJD (date) Instrument X-ray (§) Radio (†) Brγ EW [Å] (‡) BrγFWHM [km s−1] Ks (AB mag)
E–18A 58 263.207 (2018-05-25) GTC/EMIR High Quiet 10.8 ± 0.7 590 ± 30 14.53 ± 0.12
E–18B 58 305.005 (2018-07-06) GTC/EMIR High Quiet 9.7 ± 0.6 630 ± 30
E–18C 58 315.951 (2018-07-16) GTC/EMIR High Quiet 6.5 ± 0.9 620 ± 60
E–18D 58 354.025 (2018-08-24) GTC/EMIR High Quiet 3.7 ± 1.2 600 ± 150
E–19A 58 626.323 (2019-05-23) VLT/X-shooter Low Loud 66.9 ± 0.1 2090 ± 20 14.18 ± 0.03 (a)
E–19B 58 633.308 (2019-05-30) VLT/X-shooter Low Loud 33.4 ± 0.1 1058 ± 14 ∼14.9 (b)
E–19C 58 640.284 (2019-06-06) VLT/X-shooter Low Loud 59.6 ± 0.1 1740 ± 30 ∼13.6 (b)
E–19D 58 659.199 (2019-06-25) VLT/X-shooter Low Loud 27.5 ± 0.1 813 ± 11 ∼13.9 (b)
E–21A 59 446.019 (2021-08-20) GTC/EMIR Flare Quiet 7.8 ± 0.5 660 ± 40 15.33 ± 0.03

E–21B 59 451.095 (2021-08-25) GTC/EMIR Flare Quiet 6.1 ± 0.4 486 ± 13 15.10 ± 0.05
59 451.989 (2021-08-25)
59 453.075 (2021-08-27)

E–21C 59 476.904 (2021-09-19) GTC/EMIR Low Quiet 8.4 ± 0.7 810 ± 90 14.82 ± 0.04

E–22A 59 828.021 (2022-09-06) GTC/EMIR Low Quiet < 0.17
59 830.052 (2022-09-08)

E–22B 59 859.906 (2022-10-07) GTC/EMIR Low Quiet < 0.17 15.8 ± 0.2

E–22C 59 891.803 (2022-11-08) GTC/EMIR Low Quiet < 0.17 15.7 ± 0.2
59 894.810 (2022-11-11)
59 895.811 (2022-11-12)
E–23A 60 076.375 (2023-05-12) VLT/X-shooter Low Loud 138.3 ± 0.1 641 ± 7 ∼12.7 (b)
E–23B 60 082.374 (2023-05-18) VLT/X-shooter Low Loud 99.1 ± 0.1 626 ± 6 ∼12.2 (b)
E–23C 60 094.285 (2023-05-30) VLT/X-shooter Low Loud 142.7 ± 0.1 674 ± 6 ∼12.3 (b)
E–23D 60 161.195 (2023-08-05) VLT/X-shooter Low Loud 37.31 ± 0.05 620 ± 7 ∼12.9 (b)

Notes.

(§)

The label “high” indicates X-ray fluxes ≥0.2 × 10−8 erg cm−2 s−1, whereas “low” corresponds to < 0.1 × 10−8 erg cm−2 s−1. Observations taken during X-ray flares (“flare”) have associated fluxes in the range of ∼0.1 − 0.2 × 10−8 erg cm−2 s−1 (Fig. 1).

(†)

Radio-quiet periods exhibit fluxes of ∼1–5 mJy, whereas radio-loud epochs range from ∼10 to 2000 mJy (Fig. 1).

(‡)

We define EW as positive in emission.

(a)

From the value Ks = 12.33 ± 0.03 (Vega) obtained by Vishal et al. (2019) four days before E-19A. We use mAB − mVega = 1.85 (Blanton & Roweis 2007).

(b)

Derived from the flux calibrated spectra and comparison with E-19A (see Sect. 2.2).

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