Table A.1
Log of ESO-VLT FORS1 imaging polarimetry observations
| TIME (UT) | texp [s] | ANGLE[°] | FILTER |
|---|---|---|---|
| FIRST NIGHT - 09/29/08 | |||
| 05:01:57 | 330 | 0 | V_HIGH |
| 05:08:00 | 330 | 22.5 | V_HIGH |
| 05:14:03 | 330 | 45 | V_HIGH |
| 05:20:06 | 330 | 67.5 | V_HIGH |
| 05:26:32 | 330 | 0 | V_HIGH |
| 05:32:34 | 330 | 22.5 | V_HIGH |
| 05:38:38 | 330 | 45 | V_HIGH |
| 05:44:41 | 330 | 67.5 | V_HIGH |
| SECOND NIGHT - 09/30/08 | |||
| 06:25:05 | 330 | 0 | V_HIGH |
| 06:31:08 | 330 | 22.5 | V_HIGH |
| 06:37:11 | 330 | 45 | V_HIGH |
| 06:43:14 | 330 | 67.5 | V_HIGH |
| 06:49:39 | 330 | 0 | V_HIGH |
| 06:55:42 | 330 | 22.5 | V_HIGH |
| 07:01:45 | 330 | 45 | V_HIGH |
| 07:07:48 | 330 | 67.5 | V_HIGH |
| 07:19:29 | 330 | 0 | V_HIGH |
| 07:25:32 | 330 | 22.5 | V_HIGH |
| 07:31:34 | 330 | 45 | V_HIGH |
| 07:37:37 | 330 | 67.5 | V_HIGH |
| 07:44:02 | 330 | 0 | V_HIGH |
| 07:50:05 | 330 | 22.5 | V_HIGH |
| 07:56:07 | 330 | 45 | V_HIGH |
| 08:02:10 | 330 | 67.5 | V_HIGH |
| 08:14:00 | 330 | 0 | V_HIGH |
| 08:20:02 | 330 | 22.5 | V_HIGH |
| 08:26:05 | 330 | 45 | V_HIGH |
| 08:32:09 | 330 | 67.5 | V_HIGH |
| 08:38:33 | 330 | 0 | V_HIGH |
| 08:44:36 | 330 | 22.5 | V_HIGH |
| 08:50:38 | 330 | 45 | V_HIGH |
| 08:56:40 | 330 | 67.5 | V_HIGH |
Notes. GRB 080928 optical afterglow observations taken with the imaging polarimetry (IPOL) mode at ESO-VLT FORS1, on the nights of 2008 September 28 and 2008 September 29. There are a total of eight sets, two taken on the first night after the GRB event (from ~ 14 h later) and six on the following night (from 39.39 h after the burst).
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