Table 2.
Comparison of the tiles required to cover a sample of LVC localisation regions with ZTF, ATLAS, and Watcher and the fraction of these tiles which contain galaxies.
| ZTF |
ATLAS |
Watcher |
||||
|---|---|---|---|---|---|---|
| GW event | Tiles | Galaxy tiles | Tiles | Galaxy tiles | Tiles | Galaxy tiles |
| S190814bv | 58 | 58 | 98 | 98 | 12 803 | 9248 |
| S190828j | 44 | 42 | 72 | 69 | 7717 | 3677 |
| S190910d | 191 | 190 | 334 | 333 | 210 290 | 40 273 |
| S190923y | 120 | 118 | 205 | 203 | 27 708 | 23 834 |
| S190924h | 30 | 30 | 51 | 51 | 6567 | 6222 |
| S190930s | 100 | 100 | 175 | 174 | 24 352 | 19 512 |
| S190930t | 779 | 764 | 1412 | 1391 | 210 419 | 61 563 |
Notes. The 99% regions are covered in non-overlapping tiles calculated using the sky_tiling code. Tiles are equal in size to the telescope field of view, as stated in Table 1. The “Galaxy Tiles” column represents the number of tiles which contain galaxies identified by the algorithm described in this paper.
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