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Table 2.
Log of spectroscopic observations of the two LRNe.
| Date | MJD | Phase | Instrumental configuration | Exptime (s) | Range (nm) | Resolution (nm) |
|---|---|---|---|---|---|---|
| AT 2020hat | ||||||
| 2020-04-16 | 58955.99 | +2.0 | NOT+ALFOSC+gm4 | 3600 | 340–960 | 1.4 |
| 2020-04-21 | 58960.01 | +6.0 | NOT+ALFOSC+gm4 | 3600 | 340–960 | 1.8 |
| 2020-04-28( ⋆ ) | 58967.99 | +14.0 | LT+SPRAT+VPH600 | 2100 | 400–800 | 1.4 |
| 2020-05-02 | 58971.07 | +17.1 | TNG+DOLORES+LRB | 2700 | 320–795 | 1.4 |
| 2020-05-03 | 58972.02 | +18.0 | TNG+DOLORES+LRR | 2700 | 500–1030 | 1.3 |
| 2020-05-17 | 58986.95 | +33.0 | GTC+OSIRIS+R1000B+R1000R | 2400,1800 | 360–1035 | 0.7,0.8 |
| 2020-05-17 | 58986.99 | +33.0 | GTC+OSIRIS+R2500R | 3000 | 559–768 | 0.34 |
| 2020-05-29 | 58998.96 | +45.0 | TNG+DOLORES+LRB+LRR | 2400,2400 | 330–1035 | 1.0,0.9 |
| 2020-06-29 | 59029.94 | +75.9 | TNG+DOLORES+LRR | 3600 | 500–970 | 1.3 |
| AT 2020kog | ||||||
| 2020-05-27 | 58996.18 | +4.3 | GTC+OSIRIS+R1000B | 1500 | 365–785 | 0.7 |
| 2020-06-01 | 59001.17 | +9.3 | GTC+OSIRIS+R1000R | 3000 | 510–1035 | 0.8 |
| 2020-06-14 | 59014.09 | +22.2 | GTC+OSIRIS+R1000B | 3000 | 365–785 | 0.7 |
| 2020-06-29 | 59029.04 | +37.1 | GTC+OSIRIS+R1000R | 3000 | 510–1035 | 0.8 |
| 2020-08-17 | 59078.91 | +87.0 | GTC+OSIRIS+R1000R | 3000 | 510–1035 | 0.8 |
| 2020-08-17 | 59078.97 | +87.1 | NOT+ALFOSC+gm4 | 5400 | 390–960 | 1.4 |
| 2020-08-30 | 59091.92 | +100.0 | GTC+OSIRIS+R1000R | 3000 | 510–1040 | 0.8 |
Notes. Phases are from their r-band light curve peak, that in AT 2020hat and AT 2020kog are at MJDr, max = 58954.0 ± 1.5 and MJDr, max = 58991.9 ± 0.7, respectively. ( ⋆ )Low S/N spectrum, not shown in Fig. 3.
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