Open Access
Table B.1.
X-ray/optical/radio flux measurements of GRB 210731A.
| Δt | Telescope | Band/Filter | Frequency | Flux | Uncertainty | Detection? |
|---|---|---|---|---|---|---|
| (days) | (Hz) | (μJy) | (μJy) | (1 = yes) | ||
| 0.00241 | Swift/XRT | 1 keV | 2.42e+17 | 177.589 | 27.077 | 1 |
| 0.00243 | Swift/XRT | 1 keV | 2.42e+17 | 144.408 | 21.527 | 1 |
| 0.00245 | Swift/XRT | 1 keV | 2.42e+17 | 173.501 | 26.453 | 1 |
| 0.00247 | Swift/XRT | 1 keV | 2.42e+17 | 173.423 | 27.678 | 1 |
| 0.00249 | Swift/XRT | 1 keV | 2.42e+17 | 135.870 | 20.254 | 1 |
| 0.00251 | Swift/XRT | 1 keV | 2.42e+17 | 166.523 | 25.390 | 1 |
| 0.00254 | Swift/XRT | 1 keV | 2.42e+17 | 104.861 | 16.356 | 1 |
| 0.00257 | Swift/XRT | 1 keV | 2.42e+17 | 122.493 | 18.260 | 1 |
| 0.00259 | Swift/XRT | 1 keV | 2.42e+17 | 118.424 | 17.654 | 1 |
| 0.00262 | Swift/XRT | 1 keV | 2.42e+17 | 132.423 | 20.190 | 1 |
| 0.00264 | Swift/XRT | 1 keV | 2.42e+17 | 115.389 | 17.201 | 1 |
| 0.00267 | Swift/XRT | 1 keV | 2.42e+17 | 119.856 | 19.577 | 1 |
| 0.00270 | Swift/XRT | 1 keV | 2.42e+17 | 102.343 | 17.113 | 1 |
| 0.00273 | Swift/XRT | 1 keV | 2.42e+17 | 87.334 | 13.938 | 1 |
| 0.00276 | Swift/XRT | 1 keV | 2.42e+17 | 106.299 | 16.965 | 1 |
| 0.00279 | Swift/XRT | 1 keV | 2.42e+17 | 94.213 | 15.036 | 1 |
| 0.00283 | Swift/XRT | 1 keV | 2.42e+17 | 93.477 | 13.935 | 1 |
| 0.00287 | Swift/XRT | 1 keV | 2.42e+17 | 72.925 | 13.765 | 1 |
| 0.00290 | Swift/XRT | 1 keV | 2.42e+17 | 89.665 | 14.310 | 1 |
| 0.00294 | Swift/XRT | 1 keV | 2.42e+17 | 85.993 | 14.046 | 1 |
| 0.00298 | Swift/XRT | 1 keV | 2.42e+17 | 64.979 | 11.965 | 1 |
| 0.00302 | Swift/XRT | 1 keV | 2.42e+17 | 96.119 | 15.340 | 1 |
| 0.00305 | Swift/XRT | 1 keV | 2.42e+17 | 70.237 | 13.596 | 1 |
| 0.00309 | Swift/XRT | 1 keV | 2.42e+17 | 64.675 | 13.529 | 1 |
| 0.13866 | Swift/XRT | 1 keV | 2.42e+17 | 0.507 | 0.116 | 1 |
| 0.20459 | Swift/XRT | 1 keV | 2.42e+17 | 0.438 | 0.114 | 1 |
| 0.20839 | Swift/XRT | 1 keV | 2.42e+17 | 0.538 | 0.093 | 1 |
| 0.27115 | Swift/XRT | 1 keV | 2.42e+17 | 0.415 | 0.109 | 1 |
| 0.27459 | Swift/XRT | 1 keV | 2.42e+17 | 0.455 | 0.103 | 1 |
| 0.33652 | Swift/XRT | 1 keV | 2.42e+17 | 0.441 | 0.115 | 1 |
| 0.33905 | Swift/XRT | 1 keV | 2.42e+17 | 0.378 | 0.100 | 1 |
| 0.34243 | Swift/XRT | 1 keV | 2.42e+17 | 0.285 | 0.075 | 1 |
| 0.34705 | Swift/XRT | 1 keV | 2.42e+17 | 0.287 | 0.076 | 1 |
| 0.35107 | Swift/XRT | 1 keV | 2.42e+17 | 0.427 | 0.087 | 1 |
| 0.40418 | Swift/XRT | 1 keV | 2.42e+17 | 0.280 | 0.073 | 1 |
| 0.40918 | Swift/XRT | 1 keV | 2.42e+17 | 0.283 | 0.074 | 1 |
| 0.41349 | Swift/XRT | 1 keV | 2.42e+17 | 0.233 | 0.061 | 1 |
| 0.42004 | Swift/XRT | 1 keV | 2.42e+17 | 0.282 | 0.060 | 1 |
| 0.56853 | Swift/XRT | 1 keV | 2.42e+17 | 0.234 | 0.061 | 1 |
| 0.60579 | Swift/XRT | 1 keV | 2.42e+17 | 0.165 | 0.043 | 1 |
| 0.61160 | Swift/XRT | 1 keV | 2.42e+17 | 0.207 | 0.046 | 1 |
| 0.68902 | Swift/XRT | 1 keV | 2.42e+17 | 0.125 | 0.027 | 1 |
| 0.74695 | Swift/XRT | 1 keV | 2.42e+17 | 0.133 | 0.035 | 1 |
| 0.77010 | Swift/XRT | 1 keV | 2.42e+17 | 0.150 | 0.032 | 1 |
| 2.50026 | Swift/XRT | 1 keV | 2.42e+17 | 0.018 | 0.005 | 1 |
| 0.00368 | MeerLICHT | q | 5.169e+14 | 59.71 | 4.40 | 1 |
| 0.00485 | MeerLICHT | u | 7.889e+14 | 74.48 | 13.03 | 1 |
| 0.00607 | MeerLICHT | q | 5.169e+14 | 106.67 | 3.93 | 1 |
| 0.00719 | MeerLICHT | g | 6.246e+14 | 97.28 | 5.38 | 1 |
| 0.00844 | MeerLICHT | q | 5.169e+14 | 106.67 | 3.93 | 1 |
| 0.00962 | MeerLICHT | r | 4.789e+14 | 128.24 | 7.09 | 1 |
| 0.01086 | MeerLICHT | q | 5.169e+14 | 97.28 | 3.58 | 1 |
| 0.01210 | MeerLICHT | i | 3.919e+14 | 167.50 | 13.88 | 1 |
| 0.01320 | MeerLICHT | q | 5.169e+14 | 80.91 | 3.73 | 1 |
| 0.01447 | MeerLICHT | z | 3.276e+14 | 124.75 | 28.72 | 1 |
| 0.01575 | MeerLICHT | q | 5.169e+14 | 74.48 | 4.12 | 1 |
| 0.01823 | MeerLICHT | q | 5.169e+14 | 57.55 | 3.71 | 1 |
| 0.01950 | MeerLICHT | g | 6.246e+14 | 50.59 | 5.59 | 1 |
| 0.02076 | MeerLICHT | q | 5.169e+14 | 56.50 | 3.64 | 1 |
| 0.02193 | MeerLICHT | r | 4.789e+14 | 68.55 | 7.58 | 1 |
| 0.02311 | MeerLICHT | q | 5.169e+14 | 58.62 | 3.78 | 1 |
| 0.02438 | MeerLICHT | i | 3.919e+14 | 77.27 | 14.23 | 1 |
| 0.02564 | MeerLICHT | q | 5.169e+14 | 61.38 | 3.96 | 1 |
| 0.02691 | MeerLICHT | z | 3.276e+14 | 100.01 | 32.24 | 1 |
| 0.02818 | MeerLICHT | q | 5.169e+14 | 69.19 | 5.10 | 1 |
| 0.02936 | MeerLICHT | u | 7.889e+14 | 47.87 | 15.87 | 1 |
| 0.03061 | MeerLICHT | q | 5.169e+14 | 67.30 | 4.34 | 1 |
| 0.03189 | MeerLICHT | g | 6.246e+14 | 67.30 | 7.44 | 1 |
| 0.03318 | MeerLICHT | q | 5.169e+14 | 64.87 | 3.58 | 1 |
| 0.03438 | MeerLICHT | r | 4.789e+14 | 78.71 | 7.97 | 1 |
| 0.03559 | MeerLICHT | q | 5.169e+14 | 84.73 | 4.68 | 1 |
| 0.03684 | MeerLICHT | i | 3.919e+14 | 86.30 | 12.72 | 1 |
| 0.03811 | MeerLICHT | q | 5.169e+14 | 82.42 | 4.55 | 1 |
| 0.03942 | MeerLICHT | z | 3.276e+14 | 128.24 | 35.43 | 1 |
| 0.04071 | MeerLICHT | q | 5.169e+14 | 87.91 | 4.05 | 1 |
| 0.04199 | MeerLICHT | u | 7.889e+14 | 55.47 | 17.37 | 1 |
| 0.04321 | MeerLICHT | q | 5.169e+14 | 86.30 | 3.97 | 1 |
| 0.04450 | MeerLICHT | g | 6.246e+14 | 77.99 | 6.46 | 1 |
| 0.04577 | MeerLICHT | q | 5.169e+14 | 90.37 | 4.16 | 1 |
| 0.04696 | MeerLICHT | r | 4.789e+14 | 88.72 | 8.17 | 1 |
| 0.04815 | MeerLICHT | q | 5.169e+14 | 93.76 | 5.18 | 1 |
| 0.04939 | MeerLICHT | i | 3.919e+14 | 154.18 | 12.78 | 1 |
| 0.05064 | MeerLICHT | q | 5.169e+14 | 92.90 | 4.28 | 1 |
| 0.05189 | MeerLICHT | z | 3.276e+14 | 197.71 | 38.24 | 1 |
| 0.05312 | MeerLICHT | q | 5.169e+14 | 97.28 | 3.58 | 1 |
| 0.05430 | MeerLICHT | u | 7.889e+14 | 76.56 | 18.33 | 1 |
| 0.05548 | MeerLICHT | q | 5.169e+14 | 106.67 | 4.91 | 1 |
| 0.05675 | MeerLICHT | g | 6.246e+14 | 89.54 | 6.60 | 1 |
| 0.05801 | MeerLICHT | q | 5.169e+14 | 103.76 | 4.78 | 1 |
| 0.05919 | MeerLICHT | r | 4.789e+14 | 125.90 | 9.28 | 1 |
| 0.06037 | MeerLICHT | q | 5.169e+14 | 101.87 | 4.69 | 1 |
| 0.06149 | MeerLICHT | i | 3.919e+14 | 124.75 | 12.64 | 1 |
| 0.06275 | MeerLICHT | q | 5.169e+14 | 101.87 | 5.63 | 1 |
| 0.06398 | MeerLICHT | z | 3.276e+14 | 164.45 | 46.95 | 1 |
| 0.06522 | MeerLICHT | q | 5.169e+14 | 100.01 | 5.53 | 1 |
| 0.06766 | MeerLICHT | q | 5.169e+14 | 100.93 | 6.51 | 1 |
| 0.06893 | MeerLICHT | g | 6.246e+14 | 75.86 | 7.69 | 1 |
| 0.07020 | MeerLICHT | q | 5.169e+14 | 98.18 | 5.43 | 1 |
| 0.07143 | MeerLICHT | r | 4.789e+14 | 115.88 | 11.74 | 1 |
| 0.07275 | MeerLICHT | q | 5.169e+14 | 99.09 | 5.48 | 1 |
| 0.07403 | MeerLICHT | i | 3.919e+14 | 151.37 | 16.73 | 1 |
| 0.07527 | MeerLICHT | q | 5.169e+14 | 100.93 | 5.58 | 1 |
| 0.07651 | MeerLICHT | z | 3.276e+14 | 210.88 | 40.79 | 1 |
| 0.08293 | MeerLICHT | q | 5.169e+14 | 97.28 | 6.27 | 1 |
| 0.08413 | MeerLICHT | r | 4.789e+14 | 114.82 | 14.81 | 1 |
| 0.08532 | MeerLICHT | q | 5.169e+14 | 103.76 | 6.69 | 1 |
| 0.08659 | MeerLICHT | i | 3.919e+14 | 129.43 | 23.84 | 1 |
| 0.08914 | MeerLICHT | z | 3.276e+14 | 307.63 | 62.33 | 1 |
| 0.09540 | MeerLICHT | q | 5.169e+14 | 120.23 | 7.75 | 1 |
| 0.09662 | MeerLICHT | r | 4.789e+14 | 121.35 | 14.53 | 1 |
| 0.10654 | MeerLICHT | g | 6.246e+14 | 60.82 | 9.52 | 1 |
| 0.10781 | MeerLICHT | q | 5.169e+14 | 92.90 | 6.85 | 1 |
| 0.10899 | MeerLICHT | r | 4.789e+14 | 114.82 | 10.58 | 1 |
| 0.11016 | MeerLICHT | q | 5.169e+14 | 93.76 | 6.05 | 1 |
| 0.11138 | MeerLICHT | i | 3.919e+14 | 110.67 | 17.33 | 1 |
| 0.11252 | MeerLICHT | q | 5.169e+14 | 98.18 | 6.33 | 1 |
| 0.11377 | MeerLICHT | z | 3.276e+14 | 157.05 | 40.50 | 1 |
| 0.11503 | MeerLICHT | q | 5.169e+14 | 99.09 | 6.39 | 1 |
| 0.11754 | MeerLICHT | q | 5.169e+14 | 104.72 | 6.75 | 1 |
| 0.11877 | MeerLICHT | g | 6.246e+14 | 69.83 | 10.29 | 1 |
| 0.12003 | MeerLICHT | q | 5.169e+14 | 125.90 | 6.96 | 1 |
| 0.12121 | MeerLICHT | r | 4.789e+14 | 140.61 | 14.25 | 1 |
| 0.12248 | MeerLICHT | q | 5.169e+14 | 108.65 | 10.01 | 1 |
| 0.13362 | MeerLICHT | r | 4.789e+14 | 131.83 | 14.57 | 1 |
| 0.13482 | MeerLICHT | q | 5.169e+14 | 114.82 | 9.52 | 1 |
| 0.13604 | MeerLICHT | i | 3.919e+14 | 134.28 | 25.97 | 1 |
| 0.13725 | MeerLICHT | q | 5.169e+14 | 113.77 | 11.53 | 1 |
| 0.13958 | MeerLICHT | q | 5.169e+14 | 100.01 | 11.05 | 1 |
| 0.14195 | MeerLICHT | q | 5.169e+14 | 127.07 | 8.19 | 1 |
| 0.14305 | MeerLICHT | g | 6.246e+14 | 97.28 | 11.65 | 1 |
| 0.14430 | MeerLICHT | q | 5.169e+14 | 125.90 | 6.96 | 1 |
| 0.14550 | MeerLICHT | r | 4.789e+14 | 159.97 | 14.73 | 1 |
| 0.14670 | MeerLICHT | q | 5.169e+14 | 136.78 | 7.56 | 1 |
| 0.14797 | MeerLICHT | i | 3.919e+14 | 169.05 | 26.47 | 1 |
| 0.15050 | MeerLICHT | z | 3.276e+14 | 275.44 | 48.20 | 1 |
| 0.16412 | MeerLICHT | q | 5.169e+14 | 157.05 | 21.70 | 1 |
| 0.16650 | MeerLICHT | q | 5.169e+14 | 141.91 | 27.45 | 1 |
| 0.16775 | MeerLICHT | g | 6.246e+14 | 119.13 | 24.14 | 1 |
| 0.913 | MeerLICHT | r | 4.789e+14 | 25.12 | 4.40 | 1 |
| 0.915 | MeerLICHT | q | 5.169e+14 | 24.21 | 1.56 | 1 |
| 0.915 | MeerLICHT | g | 6.246e+14 | 16.75 | 3.70 | 1 |
| 0.918 | MeerLICHT | i | 3.919e+14 | 41.31 | 8.37 | 1 |
| 1.018 | MeerLICHT | r | 4.789e+14 | 21.09 | 4.66 | 1 |
| 1.018 | MeerLICHT | q | 5.169e+14 | 23.12 | 1.28 | 1 |
| 1.020 | MeerLICHT | g | 6.246e+14 | 17.70 | 2.77 | 1 |
| 1.023 | MeerLICHT | i | 3.919e+14 | 32.21 | 8.31 | 1 |
| 2.03 | MeerLICHT | q | 5.169e+14 | 7.52 | 0.83 | 1 |
| 3.00 | MeerLICHT | q | 5.169e+14 | 3.53 | 0.68 | 1 |
| 0.00277 | Swift/UVOT | white | 7.488e+14 | 16.29 | 4.80 | 1 |
| 0.13848 | Swift/UVOT | v | 5.511e+14 | 120.23 | 19.93 | 1 |
| 0.20686 | Swift/UVOT | b | 6.848e+14 | 92.90 | 7.70 | 1 |
| 0.27287 | Swift/UVOT | uvm2 | 1.319e+15 | 13.43 | 2.60 | 1 |
| 0.340 | Swift/UVOT | uvw1 | 1.115e+15 | 16.00 | 2.21 | 1 |
| 0.349 | Swift/UVOT | u | 8.583e+14 | 47.43 | 3.93 | 1 |
| 0.408 | Swift/UVOT | uvw2 | 1.401e+15 | 5.15 | 1.23 | 1 |
| 0.418 | Swift/UVOT | v | 5.511e+14 | 87.10 | 12.03 | 1 |
| 0.560 | Swift/UVOT | b | 6.848e+14 | 36.31 | 7.69 | 1 |
| 0.606 | Swift/UVOT | uvm2 | 1.319e+15 | 3.53 | 1.40 | 1 |
| 0.650 | Swift/UVOT | uvw1 | 1.115e+15 | 5.30 | 1.37 | 1 |
| 0.694 | Swift/UVOT | u | 8.583e+14 | 13.80 | 3.94 | 1 |
| 0.747 | Swift/UVOT | uvw2 | 1.401e+15 | 3.40 | 1.13 | 0 |
| 0.757 | Swift/UVOT | v | 5.511e+14 | 27.04 | 11.21 | 1 |
| 0.802 | Swift/UVOT | b | 6.848e+14 | 21.09 | 7.19 | 1 |
| 2.79 | Swift/UVOT | uvm2 | 1.319e+15 | 1.91 | 0.64 | 0 |
| 2.90 | Swift/UVOT | uvw1 | 1.115e+15 | 2.25 | 0.75 | 0 |
| 3.20 | Swift/UVOT | u | 8.583e+14 | 7.24 | 2.41 | 0 |
| 3.21 | Swift/UVOT | b | 6.848e+14 | 15.42 | 5.14 | 0 |
| 3.21 | Swift/UVOT | white | 7.488e+14 | 3.56 | 1.19 | 0 |
| 3.21 | Swift/UVOT | v | 5.511e+14 | 35.32 | 11.77 | 0 |
| 3.71 | Swift/UVOT | uvw2 | 1.401e+15 | 1.79 | 0.60 | 0 |
| 0.18419 | GROND | g′ | 6.536e+14 | 116.96 | 1.08 | 1 |
| 0.18419 | GROND | r′ | 4.820e+14 | 148.60 | 1.37 | 1 |
| 0.18419 | GROND | i′ | 3.924e+14 | 188.81 | 1.74 | 1 |
| 0.18419 | GROND | z′ | 3.335e+14 | 227.00 | 2.09 | 1 |
| 0.18437 | GROND | J | 2.418e+14 | 307.63 | 5.67 | 1 |
| 0.18437 | GROND | H | 1.820e+14 | 428.57 | 7.89 | 1 |
| 0.18437 | GROND | K | 1.381e+14 | 554.66 | 15.33 | 1 |
| 1.225 | GROND | g′ | 6.536e+14 | 13.68 | 0.13 | 1 |
| 1.225 | GROND | r′ | 4.820e+14 | 18.20 | 0.17 | 1 |
| 1.225 | GROND | i′ | 3.924e+14 | 22.91 | 0.42 | 1 |
| 1.225 | GROND | z′ | 3.335e+14 | 27.29 | 0.50 | 1 |
| 1.225 | GROND | J | 2.418e+14 | 46.99 | 2.60 | 1 |
| 1.225 | GROND | H | 1.820e+14 | 57.02 | 5.78 | 1 |
| 1.225 | GROND | K | 1.381e+14 | 58.62 | 17.82 | 1 |
| 2.21 | GROND | g′ | 6.536e+14 | 5.11 | 0.09 | 1 |
| 2.21 | GROND | r′ | 4.820e+14 | 6.25 | 0.17 | 1 |
| 2.21 | GROND | i′ | 3.924e+14 | 7.24 | 0.40 | 1 |
| 2.21 | GROND | z′ | 3.335e+14 | 9.64 | 0.53 | 1 |
| 2.21 | GROND | J | 2.418e+14 | 20.14 | 2.78 | 1 |
| 2.21 | GROND | H | 1.820e+14 | 22.29 | 5.75 | 1 |
| 2.21 | GROND | K | 1.381e+14 | 59.71 | 19.90 | 0 |
| 5.25 | GROND | g′ | 6.536e+14 | 1.51 | 0.14 | 1 |
| 5.25 | GROND | r′ | 4.820e+14 | 1.45 | 0.17 | 1 |
| 5.25 | GROND | i′ | 3.924e+14 | 1.14 | 0.38 | 0 |
| 5.25 | GROND | z′ | 3.335e+14 | 1.57 | 0.52 | 0 |
| 5.25 | GROND | J | 2.418e+14 | 8.32 | 2.77 | 0 |
| 5.25 | GROND | H | 1.820e+14 | 15.56 | 5.19 | 0 |
| 5.25 | GROND | K | 1.381e+14 | 49.21 | 16.40 | 0 |
| 285.0 | GROND | g′ | 6.536e+14 | 0.40 | 0.07 | 1 |
| 285.0 | GROND | r′ | 4.820e+14 | 0.48 | 0.09 | 1 |
| 285.0 | GROND | i′ | 3.924e+14 | 0.76 | 0.25 | 0 |
| 285.0 | GROND | J | 2.418e+14 | 6.31 | 2.10 | 0 |
| 285.0 | GROND | H | 1.820e+14 | 10.97 | 3.66 | 0 |
| 285.0 | GROND | K | 1.381e+14 | 27.54 | 9.18 | 0 |
| 0.385 | KAIT | clear | 4.722e+14 | 104.72 | 4.82 | 1 |
| 1.183 | VLT | r | 4.830e+14 | 18.54 | 0.34 | 1 |
| 1.186 | VLT | g | 6.394e+14 | 13.18 | 0.24 | 1 |
| 1.189 | VLT | z | 3.124e+14 | 28.84 | 0.80 | 1 |
| 2.09 | NOT | r | 4.830e+14 | 6.79 | 0.25 | 1 |
| 2.10 | NOT | z | 3.124e+14 | 12.94 | 1.07 | 1 |
| 6.08 | NOT | r | 4.830e+14 | 1.05 | 0.18 | 1 |
| 10.8 | MeerKAT | L | 1.4e+09 | 42.0 | 14.0 | 0 |
| 18.2 | VLA | C | 6.0e+09 | 136.0 | 32.0 | 1 |
| 18.2 | VLA | X | 1.0e+10 | 182.0 | 8.0 | 1 |
| 34.1 | MeerKAT | L | 1.4e+09 | 41.1 | 13.7 | 0 |
| 34.2 | VLA | C | 6.0e+09 | 140.0 | 10.0 | 1 |
| 34.2 | VLA | X | 1.0e+10 | 199.0 | 9.0 | 1 |
| 59.7 | MeerKAT | L | 1.4e+09 | 40.2 | 13.4 | 0 |
| 67.1 | VLA | C | 6.0e+09 | 102.0 | 9.0 | 1 |
| 67.1 | VLA | X | 1.0e+10 | 50.0 | 15.0 | 1 |
| 118.0 | VLA | C | 6.0e+09 | 66.0 | 11.0 | 1 |
| 118.0 | VLA | X | 1.0e+10 | 37.0 | 7.0 | 1 |
Notes. All times are relative to the Swift/BAT trigger time. X-ray, optical and radio data are separated by horizontal lines. Detections are all at least at the 3σ level except for the first UVOT/white detection, which was at the 2.3σ level. Optical and radio upper limits are at the 3σ level.
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