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Table 1
Observing log.
| Object | Exp. time (s) | Airmass | Seeing (′′) |
|
|
|||
| iPTF13bvn spec. | 5100 | 1.4–1.2 | 1.2–0.9 |
| HR5501 spec. | 1 | 1.2 | 0.9 |
| iPTF13bvnBVRc | 300 | 1.2–1.3 | 0.9–1.2 |
| iPTF13bvnU | 1800 | 1.3 | 1.2 |
| PG1528BVRc | 1–3 | 1.4 | 1.3 |
| PG1528U | 30 | 1.4 | 1.3 |
| PG1525BVRc | 2–5 | 1.3 | 1.2 |
| PG1525U | 30 | 1.3 | 1.2 |
Notes. HR5501 is a spectrophotometric standard star; PG1525 and PG1528 are Landolt photometric standard fields.
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