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Table A.2.

Keck-I/LRIS spectroscopic observation log.

ID Start Date (UT) Exp. (s) Redshift Phase (d)
1 2021-10-04.44 300 0.0727 ±0.0001 -71
2 2022-07-21.57 600 0.0535±0.0003 400
3 2021-09-07.53 600 0.1197±0.0002 -110
4 2023-01-16.26 600 0.1752±0.0002 379
5 2021-08-13.43 1800 0.1500±0.0001 40
5 2021-09-07.53 900 65
6 2022-01-12.18 900 0.1250±0.0004 195
7 2021-07-06.55 600 0.1314±0.0001 363
8 2021-09-07.57 300 0.0778±0.0001 39
9 2022-01-26.27 600 0.0809± 0.0014 199
10 2021-08-13.54 1485 0.3253±0.0001 223
11 2021-08-13.54 600 0.0949±0.0001 222
12 2022-07-21.59 300 0.0338±0.0001 719
13 2021-07-06.61 750 0.3879±0.0001 332
14 2022-07-21.60 300 0.0364±0.0001 169
15 2021-08-13.62 1480 0.2682±0.0005 19
16 2022-07-21.61 600 0.0735±0.0006 168
17 2022-07-21.62 450 0.0180±0.0005 339
18 2021-10-04.58 300 0.0845±0.0001 12
19 2021-04-14.26 1200 0.2221±0.0038 15
20 2020-11-20.51 900 0.1052±0.0001 40
21 2021-05-13.27 774 0.1423±0.0001 29
22 2022-02-06.36 1160 0.2302±0.0003 118
23 2021-04-14.30 600 0.1877±0.0001 167
24 2021-05-13.32 2508 0.4553±0.0004 196
25 2021-05-13.26 584 0.1931±0.0001 8
26 2021-07-06.34 2709 0.1982±0.0004 29
26 2021-08-13.25 1800 67
26 2022-02-06.46 1770 244
27 2022-04-07.46 1800 0.2782±0.0001 124
28 2021-06-07.37 435 0.1491±0.0003 -10
29 2021-04-14.41 400 0.1503±0.0001 162
30 2022-08-02.28 1200 0.3091±0.0007 614
31 2021-06-07.39 285 0.0705±0.0002 0
32 2021-06-07.38 435 0.1995±0.0004 349
33 2021-05-13.36 1137 0.1889±0.0004 132
34 2021-04-14.42 300 0.1242±0.0003 -37
35 2021-06-07.41 585 0.2681±0.0001 16
36 2021-05-13.42 1756 0.3521±0.0006 137
37 2021-05-13.43 574 0.1540± 0.0003 116
38 2021-06-07.45 285 0.0679±0.0003 314
39 2021-06-07.45 285 0.1085±0.0002 142
40 2022-04-07.54 1800 0.2437±0.0002 113
41 2021-05-13.44 574 0.2308±0.0004 303
42 2021-06-07.47 1185 0.4385±0.0001 150
43 2021-07-06.45 600 0.1684±0.0003 -27
44 2021-05-13.46 469 0.1468±0.0003 -105
45 2021-04-14.52 300 0.1304±0.0002 242
46 2021-06-07.49 580 0.1534±0.0003 -65
47 2022-05-26.40 500 0.0965±0.0002 640
48 2022-05-26.41 600 0.1415±0.0002 97
49 2021-04-14.64 500 0.2949±0.0009 247
50 2021-04-14.54 1250 0.5813±0.0006 253
51 2021-05-13.49 254 0.2265±0.0007 82
52 2022-04-07.56 900 0.4601±0.0003 390
53 2022-02-06.66 600 0.2624±0.0004 537
54 2021-06-07.54 280 0.0364±0.0001 262
55 2025-06-25.39 625 0.0882±0.0001 1370
56 2021-05-13.55 1354 0.7140±0.0002 52
57 2021-05-13.60 254 0.1089±0.0003 58
58 2022-04-07.56 900 0.0904±0.0002 182
58 2025-06-01.55 975 1333
59 2022-07-21.44 300 0.0602±0.0002 649
60 2022-05-26.46 750 0.0464±0.0003 416
61 2022-04-07.60 900 0.2593±0.0003 152
62 2022-07-21.47 600 0.1203±0.0003 753
63 2025-06-01.61 1200 0.0804±0.0001 1312
64 2021-07-06.53 600 0.1103±0.0003 56
65 2022-05-26.57 600 0.1415±0.0004 377
66 2020-11-20.22 1140 0.0939±0.0001 11
66 2020-12-12.21 600 33
66 2021-09-07.43 600 302
67 2021-10-04.43 450 0.2195±0.0004 139
68 2022-07-21.49 600 0.0549±0.0001 241
69 2022-01-12.14 600 0.1272±0.0003 573
70 2022-07-21.05 1760 0.1990±0.0001 197

Notes. Phase is observer-frame days since eROSITA X-ray peak (i.e., tX, peak in Tables A.1 and A.1). Redshifts are fit with pPXF from the Keck/LRIS spectra (see Sect. 4.2). For sources with multiple spectra (IDs 5, 26, 58, and 66), redshifts are determined from the latest, host-dominated spectra. The fit redshift uncertainties are statistical errors (scaled by χ 2 Mathematical equation: $ \sqrt{\chi^2} $).

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