Table 1
Comparison between Gaia and other existing or planned transient surveys (Bellm 2016).
| Survey | Ωfov | Platescale | mlim |  |
|---|---|---|---|---|
| (deg2) | (arcsec) | (deg2 h−1) | ||
| Gaia (2 FOVs) | 0.9 | 0.06 × 0.18 | 20.7 | 81.4 |
| ASAS-SN | 73.0 | 7.8 | 17 | 1294 |
| ATLAS | 60.0 | 1.9 | 20.0 | 5684 |
| CRTS-2 | 19.0 | 1.5 | 19.5 | 1628 |
| PS1 | 7.0 | 0.3 | 21.8 | 630 |
| ZTF | 47 | 1.0 | 20.4 | 3760 |
| LSST | 9.6 | 0.2 | 24.7 | 842 |
Notes. For each survey we list the instantaneous field-of-view (Ωfov; Gaia has two fields-of-view), the size of the pixels, the limiting magnitude, and the areal survey rate (
). We note that Gaia and ASAS-SN are the only surveys which cover the whole sky. We further note that all the other transient surveys employ difference-imaging techniques to identify transients, while GSA is a purely catalogue driven survey (see discussion in Sect. 2.7).
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