Table 1.
Log of optical and NIR images obtained on the GRB 150309A field (top panel for the afterglow and bottom panel for the potential host galaxy).
| Date | T–T0 | Telescope/ | Filter/ | Exposure time | Magnitude/ Upper limit |
|---|---|---|---|---|---|
| (UT, mid) | (s) | instrument | grism | (s) | |
| 09 Mar. 2015, 23:05:53 | 362 | 0.6 m BOOTES-2/TELMA | − | 60 | ≥18.0 |
| 09 Mar. 2015, 23:05:53 | 362 | 0.3 m BOOTES-1 | − | 60 | ≥16.5 |
| 09 Mar. 2015, 23:11:08 | 677 | 0.6 m BOOTES-2/TELMA | − | 120 | ≥20.2 |
| 10 Mar. 2015, 00:03:21 | 3810 | 0.6 m BOOTES-2/TELMA | i | 5400 | ≥21.0 |
| 10 Mar. 2015, 01:22:34 | 8563 | 0.6 m BOOTES-2/TELMA | z | 3600 | ≥19.2 |
| 10 Mar. 2015, 03:21:26 | 15695 | 0.6 m BOOTES-2/TELMA | Y | 9300 | ≥18.0 |
| 10 Mar. 2015, 04:15 | 18909 | GTC (CIRCE) | KS | 300 | 19.28 ± 0.11 ( * ) |
| 10 Mar. 2015, 04:25 | 19509 | GTC (CIRCE) | H | 300 | ≥21.4 ( * ) |
| 10 Mar. 2015, 04:35 | 20109 | GTC (CIRCE) | J | 300 | ≥21.3 ( * ) |
| 10 Mar. 2015, 05:09 | 22149 | GTC (CIRCE) | KS | 300 | 19.50 ± 0.20 ( * ) |
| 03 Jul. 2015, 00:30 | 115.0625 (days) | GTC (CIRCE) | KS | 1800 | ≥21.5 ( * ) |
| 03 Jul. 2015, 00:40 | 115.0696 (days) | GTC (CIRCE) | H | 1800 | ≥22.0 ( * ) |
| Date | T–T0 | Telescope/ | Filter/ | Exposure time | Magnitude/ Upper limit |
| (UT, mid) | (days) | instrument | grism | (s) | |
| 19 Jul. 2015, 01:31:50 | 131.1054 | GTC (OSIRIS) | r | 1800 (15 × 120 s) | 25.26 ± 0.27 |
| 24 Aug. 2015, 00:34:18 | 167.0654 | GTC (OSIRIS) | i | 2160 (24 × 90 s) | 24.89 ± 0.16 |
| 25 Aug. 2015, 23:33:37 | 169.0233 | GTC (OSIRIS) | i | 2160 (24 × 90 s) | 25.09 ± 0.39 |
| 07 Jul. 2016, 01:32:06 | 485.1058 | GTC (OSIRIS) | R1000B | 3600 (3 × 1200 s) | – |
| 30 Jul. 2016, 00:26:21 | 508.0600 | GTC (OSIRIS) | g | 1200 (8 × 150 s) | 25.56 ± 0.27 |
| 30 Jul. 2016, 01:20:48 | 508.0979 | GTC (OSIRIS) | i | 900 (10 × 90 s) | 24.80 ± 0.22 |
| 11 Mar. 2021, 05:54:10 | 2193.2879 | GTC (OSIRIS) | z | 1890 (42 × 45 s) | ≥24.4 |
Notes. The magnitude values in different filters are uncorrected for the reddening due to our galaxy. The non-detection upper limit values are listed at 3σ. The magnitudes listed are given in the AB system. The ( * ) marker denotes the magnitudes in the Vega system.
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