Discovery and identification of infrared counterpart candidates of four Galactic centre low mass X-ray binaries

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Table 3

Apparent magnitudes of the LMXB counterparts.

Source
Filter	Exp (s)	Magnitude


XTE J1637 − 498^†
U	180	21.51 ± 0.14
B	180	20.77 ± 0.05
V	180	18.90 ± 0.05
R	180	17.66 ± 0.05
I	180	16.24 ± 0.16
J	90	14.80 ± 0.09
H	90	14.13 ± 0.10
K_S	90	13.55 ± 0.07
3.6 μm	...	12.87 ± 0.09
4.5 μm	...	12.51 ± 0.10
5.8 μm	...	12.41 ± 0.17
8.0 μm	...	12.28 ± 0.24


IGR J17379 − 3747^†
R	180	21.5 ± 0.3
I	180	20.0 ± 0.4
J	90	18.3 ± 0.1
H	90	≳ 18.0
K_S	90	≳ 18.0

IGR J17585−3057
K_S	54	14.18 ± 0.05
3.6 μm	...	11.38 ± 0.05
4.5 μm	...	10.71 ± 0.05
5.8 μm	...	10.07 ± 0.05
8.0 μm	...	9.30 ± 0.03

GX 9+1
K_S	90	15.35 ± 0.04

Notes.

^(†)

For observations with 2 epochs, magnitudes were consistent so we present the weighted average and, since the exposures being compared were equal, the exposure of a single image.

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