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Table A.1.

Sources per FXT for which we extracted spectra from the MUSE cubes, according to the selection criteria explained in Section 3.2.

Source RA Dec mR, AB Lines detected z DL offset LX, peak MR, AB Pch
(degrees) (degrees) (Gpc) (kpc) (1044 erg s−1)

XRT 030510
2 76.78438 -31.8761 22.54±0.05 [OII], Hβ, [OIII] 0.65510(1) 4.0 216±4 45 -20.49±0.05 0.9846
4 76.78093 -31.875 24.91±0.15 [OII], [OIII] 0.628611(6) 3.8 149±4 40 -18.01±0.15 1.0
5 76.7816 -31.87499 25.11±0.17 [OII], Hβ, [OIII] 0.73252(6) 4.6 165±4 59 -18.22±0.17 1.0
12 76.77125 -31.87208 21.7±0.03 [OII], Hβ, [OIII]λ5007Å, Ca H+K 0.48551(3) 2.8 141±3 21 -20.54±0.03 0.7111
14 76.77442 -31.87156 23.8±0.09 [OIII] 0.54879(2) 3.3 87±3 29 -18.77±0.09 0.8783
19 76.78326 -31.87029 24.63±0.13 [OII], [OIII], Hα 0.30944(3) 1.7 75±2 7 -16.47±0.13 0.9969
20 76.77127 -31.87026 21.1±0.03 [OII], Hβ, [OIII] 0.62900(4) 3.8 148±4 40 -21.83±0.03 0.4858
22 76.77946 -31.86843 22.52±0.05 [OII], Hβ, [OIII] 0.46611(3) 2.7 36±3 19 -19.62±0.05 0.1466
23 76.77897 -31.86818 22.580.05 [OII], Hβ, [OIII] 0.4370(1) 2.5 343 17 -19.40.05 0.1461
25 76.7752 -31.86799 23.36±0.07 [OII] 1.357 9.9 92±5 269 -21.62±0.07 0.6186
27 76.7713 -31.86718 24.82±0.15 Hβ, [OIII] 0.68966(3) 4.3 165±4 51 -18.35±0.15 1.0
32 76.76918 -31.86638 23.28±0.07 [OII] 0.997 6.8 244±4 125 -20.87±0.07 0.9992
37 76.76946 -31.86383 23.50.08 [OII], [OIII] 0.30729(9) 1.6 1572 7 -17.580.08 1.0
43 76.77866 -31.86172 26.290.29 [OII], Hβ, [OIII] 0.5047(1) 2.9 1803 23 -16.060.29 1.0
44 76.77353 -31.86169 23.86±0.09 [OII] 1.1 7.6 267±4 160 -20.55±0.09 1.0

XRT 100831

2 90.0105 -52.72306 23.79±0.09 [OII], Hβ, [OIII] 0.56071(6) 3.3 214±6 11 -18.83±0.09 1.0
6 90.00257 -52.72208 25.26±0.18 [OII], Hβ, [OIII] 0.72433(3) 4.6 193±6 22 -18.04±0.18 1.0
8 90.015 -52.72125 21.17±0.03 [OII], Hβ, [OIII], Ca H+K 0.55973(9) 3.3 215±6 11 -21.45±0.03 0.81
9 90.0104 -52.72072 21.7±0.03 [OII], Hβ, [OIII], Hα, Ca H+K 0.27709(6) 1.5 107±4 2 -19.13±0.03 0.7624
19 90.01407 -52.71556 25.90.24 [OII] 1.100 7.6 1787 62 -18.520.24 1.0
21 90.00428 -52.71513 26.470.31 [OII] 1.22 8.7 67 80 -18.220.31 0.0435
24 89.99377 -52.71502 24.27±0.11 [OII] 1.011 6.9 191±7 50 -19.92±0.11 0.9999
25 90.00977 -52.71465 24.98±0.16 [OII], Hβ, [OIII]λ5007Å 0.61107(2) 3.7 82±6 14 -17.87±0.16 0.9834
26 89.99254 -52.71467 26.24±0.28 [OII] 1.009 6.9 214±7 50 -17.94±0.28 1.0
31 90.01075 -52.71374 23.61±0.08 Hβ, [OIII], Hα 0.2265(8) 1.2 54±3 1 -16.71±0.08 0.8881
36 90.00258 -52.71291 23.23±0.07 [OII], Hβ, [OIII] 0.6031(2) 3.7 58±6 14 -19.58±0.07 0.4209
38 90.01374 -52.71222 24.41±0.12 [OII] 0.610 3.7 157±6 14 -18.44±0.12 0.9999
39 90.01687 -52.71237 22.61±0.05 Hβ, [OIII]λ5007Å, Hα 0.14225(2) 0.7 74±2 0 -16.6±0.05 0.981
41 89.9922 -52.71152 25.36±0.19 [OII] 1.385 10.2 254±7 109 -19.68±0.19 1.0
48 89.99782 -52.70943 20.63±0.02 [OII], Hβ, [OIII], Hα 0.323714(5) 1.7 119±4 3 -20.58±0.02 0.4692
49 90.00501 -52.70799 23.31±0.07 [OII], Hβ, [OIII], Hα 0.32371(4) 1.7 121±4 3 -17.9±0.07 0.9946

XRT 060207

2 196.83312 -40.46675 25.05±0.16 [OII] 0.795 5.1 163±15 82 -18.5±0.16 1.0
4 196.82867 -40.46728 20.23±0.02 Ca H+K 0.58811(4) 3.5 170±13 39 -22.52±0.02 0.3802
10 196.82279 -40.46511 24.29±0.11 [OII] 1.429 10.5 259±16 349 -20.82±0.11 1.0
11 196.83542 -40.46528 23.24±0.07 [OII], Hβ, [OIII] 0.44222(4) 2.5 106±11 19 -18.76±0.07 0.9212
12 196.82467 -40.46517 22.00±0.04 [OII], Hβ, [OIII], Ca H+K 0.53148(4) 3.1 167±12 31 -20.48±0.04 0.863
15 196.82317 -40.46425 22.82±0.06 [OII], Hβ, [OIII] 0.72830(7) 4.6 205±14 66 -20.49±0.06 0.9864
20 196.84221 -40.46281 24.21±0.11 [OII] 0.884 5.8 226±15 106 -19.62±0.11 1.0
25 196.84233 -40.46228 23.76±0.09 [OII], Hβ, [OIII] 0.59278(2) 3.6 193±13 40 -19.01±0.09 0.9999
36 196.83279 -40.46094 24.51±0.13 [OII] 0.939 6.3 14±15 123 -19.48±0.13 0.0575
37 196.8215 -40.46081 24.66±0.14 [OII] 1.153 8.1 248±16 205 -19.88±0.14 1.0
41 196.84154 -40.45983 21.1±0.03 [OII], Ca H+K 0.591164(1) 3.6 177±13 40 -21.67±0.03 0.6364
42 196.83575 -40.45864 24.31±0.12 [OII] 1.157 8.1 108±16 207 -20.24±0.12 0.9454
43 196.82512 -40.458 23.83±0.09 [OII] 1.385330(1) 10.2 190±16 323 -21.2±0.09 0.9974
44 196.83625 -40.45797 20.24±0.02 [OII] 0.986 6.7 126±16 139 -23.88±0.02 0.1682
45 196.8275 -40.45833 22.0±0.04 Ca H+K 0.58761(7) 3.5 108±13 39 -20.75±0.04 0.5268
46 196.82804 -40.45772 21.72±0.04 [OII] 0.767 4.9 123±14 75 -21.73±0.04 0.4674
48 196.82937 -40.45728 21.92±0.04 [OII], Hβ, [OIII] 0.62575(8) 3.8 107±13 45 -21.0±0.04 0.4786
51 196.82308 -40.45669 22.03±0.04 [OII], Hβ, [OIII] 0.58731(4) 3.5 199±13 39 -20.72±0.04 0.9268
55 196.8275 -40.45606 21.38±0.03 Ca H+K 0.58839(6) 3.5 148±13 39 -21.36±0.03 0.5848
57 196.83033 -40.45503 24.68±0.14 Hβ, [OIII]λ5007Å 0.624(2) 3.8 152±13 45 -18.23±0.14 1.0
59 196.828 -40.45511 22.25±0.04 Ca H+K 0.73265(8) 4.6 178±14 67 -21.08±0.04 0.873
63 196.83371 -40.45233 23.72±0.09 [OII] 1.430 10.6 270±16 350 -21.4±0.09 1.0
XRT 070618
0 24.27846 -12.96053 22.96±0.06 [OII], Hβ, [OIII] 0.431 2.4 179±5 75 -18.99±0.06 0.9975
2 24.27712 -12.96017 22.34±0.05 [OII] 1.291 9.3 243±8 1087 -22.51±0.05 0.9554
3 24.27712 -12.95964 22.32±0.05 [OII], Hβ, [OIII], Hα 0.36744(2) 2.0 138±5 51 -19.22±0.05 0.9304
6 24.27108 -12.95933 24.87±0.15 [OII], Hβ, [OIII], Hα 0.36758(1) 2.0 150±5 51 -16.67±0.15 1.0
9 24.27462 -12.95764 24.73±0.14 [OII] 1.223 8.7 158±8 951 -19.97±0.14 0.9998
14 24.27587 -12.95586 21.16±0.03 [OII], Hβ, [OIII], Ca H+K 0.43200(1) 2.5 71±5 75 -20.78±0.03 0.209
17 24.27162 -12.95489 23.25±0.07 [OII], Hβ, [OIII] 0.44380(3) 2.5 90±5 80 -18.76±0.07 0.8431
22 24.28117 -12.95281 18.86±0.01 Ca H+K 0.2080(1) 1.1 72±3 14 -21.26±0.01 0.108
23 24.282 -12.95108 21.01±0.03 [OII], Ca H+K 0.660367(1) 4.1 174±6 209 -22.04±0.03 0.5629
26 24.27038 -12.95019 23.19±0.07 [OII] 0.921 6.1 154±7 472 -20.75±0.07 0.9369
27 24.27629 -12.95014 22.86±0.06 [OII], [OIII] 0.60702(3) 3.7 65±6 170 -19.97±0.06 0.4039
30 24.27279 -12.94792 22.99±0.06 [OII], [OIII]λ5007Å, Hα 0.36762(2) 2.0 99±5 51 -18.54±0.06 0.898
33 24.27587 -12.94758 21.29±0.03 [OII], Hβ, [OIII], Ca H+K 0.48739(2) 2.8 112±6 100 -20.97±0.03 0.4302

Notes. See Section 5.2 for how this redshift was obtained. The source numbers are indicated in Figure 1. RA and Dec are the source’s centroid coordinates in the R-band images and the apparent magnitude is the Kron magnitude in the R-band images, uncorrected for Galactic extinction. We also indicate what emission and/or absorption lines were identified in the spectra to obtain the redshift. The redshift is presented with the estimated uncertainty in the last digit between brackets. The distance is the luminosity distance calculated using the DISTANCE module within ASTROPY.COSMOLOGY using the redshift listed in the table. The offset is calculated between the centroid positions of the FXT and the candidate host galaxy, using only the error on the FXT position to calculate the error on the offset. LX, peak is reported in the 0.3–10 keV energy range. The absolute magnitude (uncorrected for Galactic extinction) is calculated using the distance listed in the table and Pch is calculated as described in Section 3.6.

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