Table 1.
General information on the spectra of AT 2019zhd.
| Date | MJD | Phase | Instrumental configuration | Exptime | Resol. | Range |
|---|---|---|---|---|---|---|
| (days) | (s) | (nm) | (nm) | |||
| 2020 Feb 13 | 58892.9 | +0.9 | LT + SPRAT | 300 | 1.4 | 400−800 |
| 2020 Feb 14 | 58893.8 | +1.8 | Copernico + AFOSC + VPH7 + VPH6 | 1200 + 1200 | 1.5 + 1.5 | 330−930 |
| 2020 Feb 15 | 58894.8 | +2.8 | Copernico + AFOSC + VPH7 | 2000 | 1.5 | 340−730 |
| 2020 Feb 15 | 58894.8 | +2.8 | Galileo + B&C + 300tr | 5400 | 0.6 | 330−780 |
| 2020 Feb 17 | 58896.9 | +4.9 | NOT + ALFOSC + gm4 | 1800 | 1.4 | 360−960 |
| 2020 Feb 18 | 58897.9 | +5.9 | Copernico + AFOSC + VPH6 + VPH7 | 1800 + 1500 | 1.5 + 1.5 | 350−920 |
| 2020 Feb 21 | 58900.8 | +8.8 | GTC + OSIRIS + R2500V + R2500R | 360 + 360 | 0.21 + 0.25 | 443−768 |
| 2020 Feb 28 | 58907.8 | +15.8 | Copernico + AFOSC + VPH6 | 3600 | 1.5 | 500−920 |
| 2020 Mar 05 | 58913.9 | +21.9 | NOT + ALFOSC + gm4 | 2700 | 1.8 | 350−960 |
| 2020 Mar 12 | 58920.9 | +28.9 | NOT + ALFOSC + gm4 | 1200 | 1.8 | 420−960 |
Notes. The phases are from the r-band maximum (on MJD = 58892.0 ± 0.5). LT = 2.0 m Liverpool Telescope (La Palma, Canary Islands, Spain); Copernico = 1.82 m Copernico Telescope (INAF – Padova Observatory; Mt. Ekar, Asiago, Italy); Galileo = 1.22 m Galileo Telescope (Padova University, Asiago – Pennar, Italy); GTC = 10.4 m Gran Telescopio Canarias (La Palma, Canary Islands, Spain); NOT = 2.56 m Nordic Optical Telescope (La Palma, Canary Islands, Spain).
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