Table A.4.
HST magnitudes m, and their uncertainties δm, for the second epoch of AT 2023fhn imaging at ∼200 days (see Table A.2).
| Filter | Method | Bkg. | Aper. | m | δm |
|---|---|---|---|---|---|
| F225W | PHOTUTILS | Median | 0.2″ | >26.1 | - |
| F225W | PHOTUTILS | Annulus | 0.2″ | >26.1 | - |
| F225W | PHOTUTILS | Median | 0.4″ | >25.4 | - |
| F225W | PHOTUTILS | Annulus | 0.4″ | >25.5 | - |
| F336W | PHOTUTILS | Median | 0.2″ | >26.6 | - |
| F336W | PHOTUTILS | Annulus | 0.2″ | >26.6 | - |
| F336W | PHOTUTILS | Median | 0.4″ | >25.9 | - |
| F336W | PHOTUTILS | Annulus | 0.4″ | >25.9 | - |
| F555W | PHOTUTILS | Median | 0.2″ | 26.9 | 0.2 |
| F555W | PHOTUTILS | Annulus | 0.2″ | 27.1 | 0.3 |
| F555W | PHOTUTILS | Median | 0.4″ | 25.8 | 0.2 |
| F555W | PHOTUTILS | Annulus | 0.4″ | 25.6 | 0.1 |
| F763M | PHOTUTILS | Median | 0.2″ | >26.0 | - |
| F763M | PHOTUTILS | Annulus | 0.2″ | >26.0 | - |
| F763M | PHOTUTILS | Median | 0.4″ | >25.3 | - |
| F763M | PHOTUTILS | Annulus | 0.4″ | 25.0 | 0.3 |
| F814W | PHOTUTILS | Median | 0.2″ | 26.4 | 0.2 |
| F814W | PHOTUTILS | Annulus | 0.2″ | 26.5 | 0.3 |
| F814W | PHOTUTILS | Median | 0.4″ | 25.3 | 0.2 |
| F814W | PHOTUTILS | Annulus | 0.4″ | 25.2 | 0.2 |
| F845M | PHOTUTILS | Median | 0.2″ | >25.6 | - |
| F845M | PHOTUTILS | Annulus | 0.2″ | >25.6 | - |
| F845M | PHOTUTILS | Median | 0.4″ | >24.9 | - |
| F845M | PHOTUTILS | Annulus | 0.4″ | >24.9 | - |
Notes. Upper limits are given at 3σ. In all six filters, two photometry methods are listed - aperture photometry with median background estimation, and aperture photometry with annulus background estimation. Two aperture sizes (and hence enclosed energy corrections) are given in each case.
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