Table A.1.
General information on the spectra of AT 2017jfs.
| Date | MJD | Phase (days) | Instrumental configuration | Exptime (s) | Res (Å) | Range (Å) |
|---|---|---|---|---|---|---|
| 2018 Jan 6 | 58124.31 | +9.5 | NTT+EFOSC2+gm13 | 600 | 18 | 3650−9200 |
| 2018 Jan 10 | 58128.26 | +13.5 | NOT+ALFOSC+gm4 | 3600 | 18 | 3600−9650 |
| 2018 Jan 17 | 58135.33 | +20.5 | NTT+EFOSC2+gm11 | 2 × 3600 | 14 | 3350−7450 |
| 2018 Jan 20 | 58138.16 | +23.4 | NOT+ALFOSC+gm4 | 3600 | 14 | 3500−9700 |
| 2018 Jan 24 | 58142.41 | +27.6 | P200+DBSP+gt316/7500 | 1200 | 5.5 | 5400−9500 |
| 2018 Feb 13 | 58162.22 | +47.4 | NTT+EFOSC2+gm11 | 2 × 3600 | 14 | 3350−7450 |
| 2018 Feb 23 | 58172.10 | +57.3 | GTC+OSIRIS+R1000B+R1000R | 1800 + 1800 | 7.0 + 7.8 | 3850−9250 |
| 2018 Mar 20 | 58197.10 | +82.3 | GTC+OSIRIS+R1000B+R1000R | 1800 + 1800 | 7.0 + 7.8 | 3650−9350 |
| 2018 Apr 22 | 58230.94 | +116.1 | BTA+SCORPIO+VPHG550G | 2 × 1200 | 13 | 3650−7900 |
| 2018 Apr 29 | 58237.05 | +122.3 | GTC+OSIRIS+R1000B+R1000R | 2 × 900 + 2 × 900 | 7.0 + 7.8 | 3650−9200 |
| 2018 May 23 | 58261.06 | +146.3 | GTC+OSIRIS+R1000B+R1000R | 2 × 1600 + 1600 | 7.0 + 7.8 | 3650−9250 |
| 2018 Jun 1 | 58270.98 | +156.2 | GTC+OSIRIS+R1000R | 2 × 1800 | 7.8 | 5100−9350 |
| 2018 Jun 2 | 58271.97 | +157.2 | GTC+OSIRIS+R1000R | 2 × 1800 | 7.8 | 5100−9350 |
| 2018 Jun 16 | 58285.93 | +171.1 | GTC+OSIRIS+R1000R | 4 × 1500 | 7.8 | 5100−9250 |
Notes. The phases are from the g-band maximum. NTT = 3.58 m New Technology Telescope (ESO-La Silla, Chile); NOT = 2.56 m Nordic Optical Telescope (La Palma, Canary Islands, Spain); P200 = 5.1 m (200-inch) Hale Telescope (Mt. Palomar, California, USA); GTC = 10.4 m Gran Telescopio Canarias (La Palma, Canary Islands, Spain); BTA = 6.05 m Bolshoi Teleskop Alt-azimutalnyi (Special Astrophysical Observatory, Karachay-Cherkessian Republic, Russia).
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