Open Access
Table A.3.
General information on the spectroscopic observations of AT 2021biy.
| Date | MJD | Phasea | Telescope+Instrument | Grism+Slit | Spectral range | Resolution | Exp. time |
|---|---|---|---|---|---|---|---|
| (days) | (Å) | (Å) | (s) | ||||
| 20210130 | 59244.45 | −6.6 | OGG 2m+FLOYDS | red/blu+2.0" | 3500-10000 | 13 | 2700 |
| 20210131 | 59245.12 | −5.9 | NOT+ALFOSC | gm4+1.0" | 3400-9680 | 14 | 2700 |
| 20210201 | 59246.48 | −4.5 | OGG 2m+FLOYDS | red/blu+2.0" | 3500-10000 | 13 | 3600 |
| 20210201 | 59246.77 | −4.2 | LJT+yf01 | grism3+2.0" | 3500-8740 | 21 | 2000 |
| 20210203 | 59248.73 | −2.3 | LJT+yf01 | grism3+2.0" | 3500-8740 | 21 | 2000 |
| 20210207 | 59252.46 | +1.5 | Shane+Kast | 300/7500+2.0" | 3620-10700 | 9.3 | 2160/2100 |
| 20210210 | 59255.68 | +4.7 | LJT+yf01 | grism3+2.0" | 3500-8740 | 21 | 2200 |
| 20210214 | 59259.86 | +8.9 | DOT+ADFOSC | GR676R+1.5" | 3800-8900 | 12 | 900 |
| 20210216 | 59261.13 | +10.1 | Ekar1.82m+AFOSC | VPH6+1.69" | 5000-9290 | 16 | 2400 |
| 20210218 | 59263.41 | +12.4 | Shane+Kast | 300/7500+2.0" | 3630-10740 | 9.3 | 2160/2100 |
| 20210307 | 59280.52 | +29.5 | Shane+Kast | 300/7500+2.0" | 3620-10730 | 9.3 | 3060/3000 |
| 20210323 | 59296.02 | +45.0 | NOT+ALFOSC | gm4+1.0" | 3400-9680 | 14 | 1800 |
| 20210403 | 59307.95 | +57.0 | NOT+ALFOSC | gm4+1.0" | 3400-9680 | 14 | 3600 |
| 20210407 | 59311.53 | +60.5 | Keck-I+LRIS | 600/4000&400/8500+1.0" | 3130-10280 | 4.7/9.0 | 900/900 |
| 20210418 | 59322.26 | +71.3 | Shane+Kast | 300/7500+2.0" | 3630-10740 | 9.3 | 3060/3000 |
| 20210518 | 59352.53 | +101.5 | Shane+Kast | 300/7500+2.0" | 3630-10750 | 9.3 | 3360/3300 |
| 20210615 | 59380.90 | +129.9 | BTA+SCORPIO-1 | VPHG1200R+1.2" | 5660-7375 | 5.6 | 2700 |
| 20210615 | 59380.99 | +130.0 | NOT+ALFOSC | gm4+1.0" | 3400-9650 | 14 | 2700 |
| 20210703 | 59398.26 | +147.3 | Shane+Kast | 300/7500+2.0" | 3630-10750 | 9.3 | 3660/3600 |
| 20210705 | 59400.96 | +150.0 | TNG+LRS | LRB/LRR+1.0" | 3500-10370 | 11/10 | 1200/1200 |
| 20210716 | 59411.19 | +160.2 | Shane+Kast | 300/7500+2.0" | 3630-10750 | 9.3 | 3660/3600 |
| 20210717 | 59412.91 | +161.9 | GTC+OSIRIS | R1000B/R1000R+1.0" | 3640-10140 | 7/8 | 1500/1500 |
| 20210802 | 59428.18 | +177.2 | Shane+Kast | 300/7500+2.0" | 3630-10750 | 9.3 | 3660/3600 |
| 20210819 | 59445.88 | +194.9 | NOT+ALFOSC | gm4+1.0" | 3400-9650 | 14 | 2400 |
| 20211103 | 59521.52 | +270.5 | Shane+Kast | 300/7500+2.0" | 3630-10750 | 9.3 | 3660/3600 |
| 20211104 | 59522.07 | +271.1 | BTA+SCORPIO-2 | VPHG1200@540+1.0" | 3800-7330 | 4 | 3600 |
| 20211205 | 59553.53 | +302.5 | Shane+Kast | 300/7500+2.0" | 3630-10750 | 9.3 | 4890/4800 |
| 20211214 | 59562.10 | +311.1 | BTA+SCORPIO-2 | VPHG1200@540+1.0" | 3800-7330 | 4 | 4200 |
| 20211228 | 59577.14 | +326.1 | NOT+ALFOSC | gm4+1.0" | 3520-9360 | 14 | 3600 |
| 20220110 | 59589.69 | +338.7 | Keck-I+MOSFIRE | JHK+0.7" | 9000-25000 | R = 3270 | 120/120/120 |
| 20220212 | 59622.09 | +371.1 | GTC+EMIR | YJ/HK+1.3" | 9000-25000 | R = 987 | 1440/2880 |
| 20220213 | 59623.52 | +372.5 | LBT+MODS | G400L/G670L+1.0" | 3500-10000 | 3.3 | 5×600 |
| 20220304 | 59642.60 | +391.6 | Keck-I+LRIS | 600/4000&400/8500+1.0" | 3130-10280 | 4.7/9.0 | 900/900 |
aPhases are relative to r-band maximum light (MJD = 59251.0 ± 1.0).
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