Open Access
Table 1.
Log of spectral observations of SN 2021efd.
| Phasea (days) | Date (UT)b | MJDb | Telescope | Instrument | Grism | Range (Å) | Resolving power |
|---|---|---|---|---|---|---|---|
| −12 | 04 Mar. 2021 | 59277.15 | NOT | ALFOSC | Gr#4 | 3200-9600 | 360 |
| −8 | 08 Mar. 2021 | 59281.23 | Baade | IMACS | Gri-300-17.5 | 3900-8000 | 1240 |
| −1 | 15 Mar. 2021 | 59288.10 | NOT | ALFOSC | Gr#4 | 3200-9600 | 360 |
| +17 | 02 Apr. 2021 | 59306.94 | NOT | ALFOSC | Gr#4 | 3200-9600 | 360 |
| +29 | 14 Apr. 2021 | 59318.94 | NOT | ALFOSC | Gr#4 | 3200-9600 | 360 |
| +315 | 03 Feb. 2022 | 59613.00 | Keck | LRIS | 400/3400-400/8500 | 3100-10300 | 1000 |
| +322 | 10 Feb. 2022 | 59620.22 | VLT | FORS2 | GRIS 300V | 4450-8700 | 440 |
| +374 | 04 Apr. 2022 | 59673.54 | Keck | LRIS | 400/3400-400/8500 | 3100-10300 | 1000 |
| +396 | 27 Apr. 2022 | 59696.00 | Keck | LRIS | 600/4000-1200/7500 | 3100-7100 | – |
| +460 | 02 Jul. 2022 | 59762.28 | Keck | LRIS | 400/3400-400/8500 | 3100-10 300 | 1000 |
| +624 | 17 Dec. 2022 | 59930.46 | MMT | Binospec | Grism 270 | 3900-9200 | 1340 |
| +741 | 16 Apr. 2023 | 60050.53 | Keck | LRIS | 400/3400-400/8500 | 3100-10300 | 1000 |
| +750 | 26 Apr. 2023 | 60060.00 | Keck | LRIS | 400/3400-400/8500 | 3100-10300 | 1000 |
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