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Table 1.

Key properties of the merged IGAPS survey.

Property Value Comment
Telescope 2.5 m Isaac Newton Telescope (INT)
Instrument Wide Field Camera (WFC)
Detectors Four 2048 × 4100 pixel CCDs
Pixel scale 0.33 arcsec pixel−1
Filters i, Hα, r, g, URGO Two r epochs available
Magnitude system Vega mAB provided as alternative
Exposure times (seconds) i:10, Hα:120, r:30, g:30, URGO:120
Saturation magnitude 12(i), 12.5(Hα), 13(r), 14(g) 14.5(URGO)
Limiting magnitude 20.4(i), 20.5(Hα), 21.5(r), 22.4(g), 21.5(URGO) Median 5σ detection over the noise.
median PSF FWHM (arcsec) 1.0(i), 1.2(Hα), 1.1(r), 1.3(g), 1.5(URGO)
Survey area ∼1860 sq. deg
Footprint boundaries −5° < b <  +5°, 30° < < 215°
Beginning/end dates of observations August 2003–November 2018 See Fig. 1

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