2026ApJ...999..244N

Query : 2026ApJ...999..244N

2026ApJ...999..244N - Astrophys. J., 999, 244 (2026/March-2)

Classification of a New X-Ray Catalog of Likely Counterparts to 4FGL-DR4 Unassociated Gamma-Ray Sources Using a Neural Network.

NEUMANN K.D., FALCONE A.D., DIKERBY S., DEPPE S., FERRARA E.C., KENNEA J.A., CENKO B. and GROVE E.

Abstract (from CDS):

Our survey of the fourth Fermi Large Area Telescope catalog (4FGL) unassociated gamma-ray source regions using the X-Ray Telescope (XRT) and Ultraviolet/Optical Telescope (UVOT) on board the Neil Gehrels Swift Observatory (Swift) provides new XRT and UVOT source detections and localizations to help identify potential low-energy counterparts to unassociated Fermi gamma-ray sources. We present a catalog of 218 singlet and 70 multiplet Swift X-ray sources detected within the positional uncertainty ellipses of 244 unassociated Fermi gamma-ray sources from the 4FGL-DR4 catalog, 144 of which are not previously cataloged by S. Kerby et al. For each X-ray source, we derive its X-ray flux and photon index, then use simultaneous UVOT observations with optical survey data to estimate its V-band magnitude. We use these parameters as inputs for a multilayer perceptron neural network classifier (NNC) trained to classify sources as blazars, pulsars, or ambiguous gamma-ray sources. For the 213 singlet sources with X-ray and optical data, we classify 173 as likely blazars (Pbzr > 0.99) and six as likely pulsars (Pbzr < 0.01), with 34 sources yielding ambiguous results. Including 70 multiplet X-ray sources, we increase the number of Pbzr > 0.99 sources to 227 and Pbzr < 0.01 sources to 16. For the subset of these classifications that have been previously studied, a large majority agree with prior classifications, supporting the validity of using this NNC to classify the unknown and newly detected gamma-ray sources.

Abstract Copyright: © 2026. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Catalogs - X-ray astronomy - Ultraviolet astronomy - Neural networks

Status at CDS : Large table(s) will be appraised for possible ingestion in VizieR.

Simbad objects: 293

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Number of rows : 293
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NVSS J000434-400032 BLL 00 04 34.2273923064 -40 00 35.201389896   17.55   16.23   ~ 17 0
2 4FGL J0017.1-4605 AGN 00 17 08.6778424510 -46 06 06.917433601           ~ 8 0
3 SUMSS J002127-591950 Bla 00 21 27.5141243041 -59 19 48.023274762           ~ 8 0
4 IRAS F00205-4222 Sy2 00 23 03.7482333936 -42 05 08.763948564   15.94       ~ 22 0
5 4FGL J0025.4-4838 BL? 00 25 36.9282171972 -48 38 09.589927829           ~ 11 0
6 NVSS J002611-073115 Bla 00 26 11.6368910448 -07 31 15.823966764   18.7   18.6   ~ 14 0
7 1RXS J002710.6-113651 EmG 00 27 10.1257411656 -11 36 37.977820956   17.48   16.15   ~ 7 0
8 SUMSS J003136-564637 BLL 00 31 35.4796812785 -56 46 41.469736929           ~ 13 0
9 1RXS J003728.4-265023 Q? 00 37 29.5276820198 -26 50 45.203912220           ~ 12 0
10 [VV2006] J003954.1-272514 QSO 00 39 54.1361 -27 25 14.283     20.64     ~ 7 0
11 4FGL J0040.2-2725 gam 00 40 14.8 -27 25 42           ~ 6 0
12 4FGL J0045.8-1324 gam 00 45 53.2 -13 24 10           ~ 7 0
13 NVSS J005758+632636 Bla 00 57 58.38912 +63 26 39.0876           ~ 17 0
14 1RXS J005807.5-460420 BL? 00 58 06.2216135789 -46 04 18.993546791           ~ 14 0
15 QSO B0056-572 Bla 00 58 46.5813154752 -56 59 11.469154272   17.91   16.95   ~ 98 1
16 4FGL J0102.3+1000 gam 01 02 23.8 +10 00 43           ~ 7 0
17 FIRST J010226.7+095939 AG? 01 02 26.6960 +09 59 39.427           ~ 2 0
18 1RXS J011804.4+143152 Sy1 01 18 04.8356416152 +14 31 58.694610900   19.40 18.94     ~ 18 0
19 PMN J0118-6008 Bla 01 18 23.4823747630 -60 07 51.392739546           ~ 12 1
20 4FGL J0120.2-7944 gam 01 20 14 -79 44.5           ~ 10 0
21 SDSS J012223.62+103213.2 BLL 01 22 23.62341 +10 32 13.2811           ~ 3 0
22 4FGL J0122.4+1034 gam 01 22 25.6 +10 34 24           ~ 8 0
23 SUMSS J012547-630242 Bla 01 25 48.1975322775 -63 02 45.153514486           ~ 11 0
24 4FGL J0126.3-6746 gam 01 26 21.6 -67 46 35           ~ 7 0
25 SUMSS J012622-674612 rG 01 26 22.14048 -67 46 23.2523           ~ 2 0
26 NVSS J013255+593217 BLL 01 32 55.2961066848 +59 32 15.927985860           ~ 16 0
27 NVSS J013724-324041 Bla 01 37 24.5053964536 -32 40 39.383752837           ~ 9 0
28 4FGL J0140.3+7054 gam 01 40 20 +70 54.2           ~ 9 0
29 4FGL J0140.4+5114 gam 01 40 28.0 +51 14 56           ~ 3 0
30 PSO J029.1022-24.3343 BLL 01 56 24.5498286186 -24 20 03.658820715           ~ 32 0
31 NVSS J015904+331258 Bla 01 59 05.2025478815 +33 12 57.632125109           ~ 16 0
32 4FGL J0159.8-2234 gam 01 59 48.1 -22 34 34           ~ 7 0
33 NVSS J020242+313212 BLL 02 02 42.0614629895 +31 32 10.984333971           ~ 8 1
34 NVSS J020946+262528 Bla 02 09 46.7301026083 +26 25 30.955609979           ~ 12 0
35 NVSS J023112+350443 Bla 02 31 12.1816277202 +35 04 44.569707052           ~ 11 0
36 2MASS J02400450-0245025 Bla 02 40 04.5086956045 -02 45 02.630391554           ~ 16 0
37 NVSS J025111-183112 BLL 02 51 11.5346306089 -18 31 12.739792179           ~ 25 1
38 4FGL J0251.4+4646 gam 02 51 28.1 +46 46 27           ~ 3 0
39 4FGL J0252.0-3657 gam 02 52 04.1 -36 57 44           ~ 7 0
40 NVSS J025857+055240 BLL 02 58 57.5559833309 +05 52 43.949781063           ~ 29 0
41 SUMSS J030115-561646 Bla 03 01 15.0863554486 -56 16 43.579319047           ~ 16 0
42 NVSS J030226+335447 Bla 03 02 27.0447847474 +33 54 45.805686772           ~ 14 1
43 NVSS J032737+262010 Bla 03 27 37.2949275153 +26 20 11.012156903           ~ 15 0
44 NVSS J033331-270919 Bla 03 33 31.9325872888 -27 09 16.533524885           ~ 8 0
45 4FGL J0343.3-6303 BL? 03 43 24.8447761582 -63 03 37.390657515           ~ 11 0
46 NVSS J040608+063920 Bla 04 06 07.9444923035 +06 39 21.989679451           ~ 22 0
47 NVSS J040922+254440 Bla 04 09 21.7397224968 +25 44 42.042738277           ~ 12 0
48 4FGL J0414.6+5711 gam 04 14 40.8 +57 11 18           ~ 8 0
49 4FGL J0418.4-4342 gam 04 18 29.6 -43 42 58           ~ 5 0
50 SUMSS J043831-424006 Bla 04 38 32.0099080933 -42 40 06.839858127           ~ 7 0
51 NVSS J050212+301936 BL? 05 02 12.85986720 +30 19 34.1691240           ~ 8 1
52 1FGL J0528.4+3838 gam 05 28 31.56 +38 51 56.3           ~ 8 0
53 NVSS J053626-120655 Bla 05 36 26.7996265371 -12 06 52.068688334           ~ 9 0
54 NVSS J053745+095756 Bla 05 37 45.92200080 +09 57 58.7351520           ~ 17 0
55 4FGL J0539.2-6333 BL? 05 40 02.9149007377 -63 32 15.582361438           ~ 13 0
56 4FGL J0540.7+3611c gam 05 40 44.1 +36 11 59           ~ 5 0
57 2MASX J05404713+3616579 G 05 40 47.13693 +36 16 57.9790           ~ 6 0
58 4FGL J0544.8+5209c gam 05 44 52.1 +52 09 37           ~ 11 0
59 SUMSS J055359-505146 Bla 05 53 59.6630683669 -50 51 43.968592222           ~ 8 0
60 NVSS J055418-025832 Bla 05 54 18.9372155456 -02 58 36.031525672           ~ 8 0
61 UCAC3 82-17607 * 06 10 31.7497034520 -49 12 21.678335676       12.800 11.97 ~ 4 0
62 4FGL J0610.8-4911 gam 06 10 51.4 -49 11 01           ~ 11 0
63 1RXS J061100.1-491034 QSO 06 11 00.1674981936 -49 10 35.019910560           ~ 4 0
64 NVSS J061141-291621 BL? 06 11 41.6606036764 -29 16 18.771637212           ~ 8 0
65 1RXS J062046.9-503405 BLL 06 20 46.1243683737 -50 33 50.926403007           ~ 15 0
66 2MASX J06225450+3120367 rG 06 22 54.4655613048 +31 20 36.376250473           ~ 9 0
67 4FGL J0624.7-4903 gam 06 24 48 -49 03.4           ~ 9 0
68 NVSS J063048+562829 Bla 06 30 48.9484305711 +56 28 31.091831125           ~ 8 0
69 NVSS J063359+584031 Bla 06 33 59.7241571539 +58 40 35.828074401           ~ 13 0
70 1RXS J065635.0+421511 Bla 06 56 35.5888239472 +42 15 24.135013151           ~ 9 0
71 SUMSS J070034-512005 Bla 07 00 33.8399746527 -51 20 06.733385601           ~ 7 0
72 4FGL J0700.8+1551 gam 07 00 49.6 +15 51 12           ~ 6 0
73 3FGL J0704.3-4828 AGN 07 04 21.8121461170 -48 26 47.412221745           ~ 19 0
74 Gaia DR3 5613015552810289152 EB* 07 22 19.6511723711 -26 47 34.195443219           ~ 2 0
75 3FGL J0722.2-2648 Bz? 07 22 27.3 -26 50 39           ~ 10 0
76 NVSS J072310-304756 BL? 07 23 10.8075332183 -30 47 54.077559410           ~ 8 0
77 4FGL J0723.9+5702 gam 07 23 58.8 +57 02 34           ~ 3 0
78 NVSS J072547-054832 BLL 07 25 47.6881059723 -05 48 27.961397547           ~ 24 0
79 NGC 2403 AGN 07 36 51.3381434280 +65 36 09.650825640 9.31 8.84 8.38 8.19   ~ 1887 1
80 2XMM J073707.3+653456 HXB 07 37 07.5 +65 34 56           ~ 6 0
81 4FGL J0737.4+6535 gam 07 37 30 +65 35.5           ~ 16 0
82 2XMM J073733.4+653308 HXB 07 37 33.42 +65 33 07.6           ~ 4 0
83 4FGL J0751.2-0029 gam 07 51 14.8 -00 29 17           ~ 3 0
84 4FGL J0752.0-2931 gam 07 52 03.2 -29 31 35           ~ 9 0
85 NVSS J075615-051254 AGN 07 56 15.89853 -05 12 55.4528           ~ 9 0
86 4FGL J0800.1-5531 gam 08 00 10.3 -55 31 35           ~ 10 0
87 NVSS J080056+073234 Bla 08 00 56.5649310192 +07 32 35.085647652           ~ 14 0
88 TGSSADR J082705.1-411152 BL? 08 27 05.7956 -41 11 57.036           ~ 8 0
89 UCAC4 244-028737 Y*? 08 44 09.0412563432 -41 19 13.492950816       14.047   ~ 6 0
90 4FGL J0844.9-4117 gam 08 44 59 -41 17.8           ~ 6 0
91 1RXS J085220.6-251636 Bla 08 52 21.9362099522 -25 16 28.130809951           ~ 4 1
92 2MASS J08590216-4730167 Y*O 08 59 02.1614125152 -47 30 16.704599364           ~ 5 0
93 RCW 38 SFR 08 59 05.50 -47 30 39.4           ~ 327 2
94 3FGL J0859.3-4732 gam 08 59 13 -47 29.3           ~ 12 0
95 4FGL J0859.3-4342 gam 08 59 18 -43 42.7           ~ 8 0
96 CXOU J085926.2-434523 Y*O 08 59 26.218 -43 45 23.66           G5V 4 0
97 4FGL J0902.8-4633 gam 09 02 49.9 -46 33 36           ~ 2 0
98 LEDA 2173127 BLL 09 03 14.7079441080 +40 55 59.851845660   19.53 18.60     ~ 47 1
99 SDSS J090343.20+405503.1 Bla 09 03 43.2032394648 +40 55 03.149169312           ~ 8 0
100 NVSS J091003-181611 Bla 09 10 03.8821999779 -18 16 12.534138105           ~ 12 0
101 NVSS J091429+684507 Bla 09 14 29.6838000415 +68 45 08.444893612           ~ 15 1
102 3FGL J0928.3-5255 AGN 09 28 18.62669 -52 57 03.0360           ~ 21 0
103 NVSS J093057-303116 Bla 09 30 57.8548797836 -30 31 18.455082798           ~ 12 0
104 1RXS J093330.2+722058 Q? 09 33 33.6734418878 +72 21 01.183817272           ~ 12 0
105 SDSS J093834.72+515452.3 Bla 09 38 34.7227349976 +51 54 52.371182736           ~ 19 0
106 4FGL J0958.6-0522 gam 09 58 39.4 -05 23 00           ~ 6 0
107 4FGL J1001.3-2040 gam 10 01 18.8 -20 40 13           ~ 5 0
108 4FGL J1016.2-5729c gam 10 16 13.1 -57 29 57           ~ 5 0
109 WR 17-1 WR* 10 16 26.2188695184 -57 28 05.775794220       17.46   WN5b 5 0
110 1RXS J101751.0-270539 Bla 10 17 50.36304 -27 05 52.5660           ~ 12 1
111 4FGL J1018.1-4051 gam 10 18 10.3 -40 51 21           ~ 10 0
112 4FGL J1020.4-5314 gam 10 20 27.9 -53 14 45           ~ 6 0
113 UCAC4 359-058596 * 10 36 10.6160332665 -18 13 15.827458642       13.489   ~ 2 0
114 4FGL J1036.5-1809 gam 10 36 34.5 -18 09 23           ~ 7 0
115 NVSS J104705+673757 Bz? 10 47 05.9214590593 +67 37 58.096901814           ~ 11 0
116 PMN J1048-5029 Bla 10 48 24.3475373627 -50 29 39.977201841           ~ 13 1
117 RX J1049.6+2742 Bla 10 49 38.7920168088 +27 42 13.037307156           ~ 23 0
118 2MASS J10542776-6008017 Y*? 10 54 27.76248 -60 08 01.7520           ~ 2 0
119 3FGL J1054.7-6006 gam 10 54 42.9 -60 08 24           ~ 8 0
120 2FGL J1058.7-6621 Bz? 10 59 15.50 -66 15 53.6           ~ 19 0
121 NVSS J110636+362650 Bla 11 06 36.5335690824 +36 26 49.913709828   20.76 20.55     ~ 32 1
122 SDSS J110710.13+361652.7 QSO 11 07 10.1353204968 +36 16 52.620747996   19.42 19.03     ~ 18 0
123 4FGL J1110.3-6501 gam 11 10 22.8 -65 01 06           ~ 5 0
124 NVSS J111114+013427 Bla 11 11 14.2909908179 +01 34 28.294537138           ~ 12 0
125 NVSS J111436+122712 rG 11 14 37.01872 +12 27 13.2073           ~ 11 0
126 NVSS J111948-100708 Bla 11 19 48.4170467086 -10 07 07.221653434           ~ 11 0
127 NVSS J112213-022913 BLL 11 22 13.7014064315 -02 29 14.227595179           ~ 13 0
128 1FGL J1123.6-4555 Bz? 11 23 55.3040252002 -45 50 18.957768273           ~ 16 0
129 GRB 140719A gB 11 26 24.28 -50 08 05.7           ~ 18 0
130 3FGL J1126.8-5001 X 11 26 24.52 -50 08 05.2           ~ 15 0
131 6C 112859+471637 BLL 11 31 42.2703110688 +47 00 08.567200728           ~ 14 1
132 NVSS J114600-063856 BLL 11 46 00.8591007005 -06 38 54.797803202           ~ 27 0
133 NVSS J115514-111118 BLL 11 55 14.8515316573 -11 11 22.629886020           ~ 21 0
134 NVSS J122014-245949 Bla 12 20 14.5466882952 -24 59 48.636719509           ~ 24 1
135 4FGL J1224.6+7011 gam 12 24 42 +70 11.8           ~ 9 0
136 1RXS J122455.2+700741 * 12 24 56.8244335894 +70 07 24.248915918   13.520 12.609 12.245   ~ 4 0
137 1RXS J123933.7-345414 AGN 12 39 33.6281895392 -34 54 27.465870757           ~ 8 0
138 NVSS J124351+172643 Bla 12 43 51.7641295440 +17 26 44.379176820           ~ 13 0
139 PMN J1250-4945 BLL 12 50 59.0599054142 -49 44 48.002867430           ~ 22 1
140 SDSS J125630.43+533204.3 QSO 12 56 30.4438137528 +53 32 04.270465064           ~ 24 0
141 3FGL J1311.8-6230 gam 13 12 37 -62 31.7           ~ 14 0
142 4FGL J1313.2-4437 gam 13 13 14.9 -44 37 28           ~ 3 0
143 1RXS J131318.9-443744 AGN 13 13 18.1517211876 -44 37 31.465851159           ~ 5 0
144 UCAC4 129-081569 PM* 13 20 16.0582850193 -64 13 48.703762102       14.821   ~ 3 0
145 4FGL J1320.3-6410c gam 13 20 21.2 -64 10 21           ~ 5 0
146 V* V1047 Cen No* 13 20 49.74 -62 37 50.5           ~ 42 0
147 4FGL J1321.1-6239 gam 13 21 08.8 -62 39 33           ~ 6 0
148 Gaia DR3 5868274671957823232 EB* 13 21 20.4648729812 -62 41 31.010423155           ~ 2 0
149 4FGL J1326.0+3507 gam 13 26 00.2 +35 07 18           ~ 11 0
150 SDSS J132622.19+350624.4 QSO 13 26 22.1926787928 +35 06 24.491769372           ~ 7 0
151 2MASS J13565717-6123149 LP? 13 56 57.1815164424 -61 23 15.066030777           ~ 2 0
152 4FGL J1357.3-6123 gam 13 57 20 -61 23.5           ~ 7 0
153 4FGL J1401.3-5012 gam 14 01 20.9 -50 12 11           ~ 5 0
154 4FGL J1407.4-0820 gam 14 07 29.5 -08 20 31           ~ 7 0
155 WISE J141046.01+740511.2 Sy1 14 10 45.9501293016 +74 05 10.904898048   19.9   19.2   ~ 38 0
156 SDSS J141546.16-150229.0 BL? 14 15 46.1714142331 -15 02 29.020827737           ~ 11 0
157 NVSS J142129-165448 AGN 14 21 28.9917984686 -16 54 56.085182559           ~ 11 0
158 2MASX J14294950-0733045 AGN 14 29 49.4792368533 -07 33 04.421700830           ~ 14 0
159 1RXS J143059.2+154555 Sy1 14 30 58.0341084024 +15 45 55.634167872   18.18 17.83     ~ 19 0
160 4FGL J1438.0+0219 gam 14 38 00.9 +02 19 38           ~ 6 0
161 NVSS J144127-193555 Bz? 14 41 27.9654208279 -19 35 52.527895489           ~ 12 0
162 4FGL J1452.0-4148 gam 14 51 49.31400 -41 45 03.4344           ~ 10 0
163 4FGL J1504.6+4343 gam 15 04 38.3 +43 43 20           ~ 8 0
164 NVSS J151436+445003 Bla 15 14 36.6304519848 +44 50 04.094172852   19.57 19.05 19.6   ~ 67 1
165 3FGL J1517.6-4442 gam 15 17 42.7 -44 46 36           ~ 13 0
166 3FGL J1526.3-4505 Bz? 15 26 23.4 -45 01 49           ~ 11 0
167 1RXS J152836.5+200423 Bla 15 28 35.7704227448 +20 04 20.131877748           ~ 21 0
168 4FGL J1543.1+4209 gam 15 43 11.8 +42 09 18           ~ 6 0
169 1FGL J1544.5-1127 Psr 15 44 14.33 -11 24 42.0           ~ 70 0
170 FBQS J1555+2903 BLL 15 55 12.9064805232 +29 03 29.926166868           ~ 10 0
171 NVSS J155712+382027 Bla 15 57 12.2682581065 +38 20 32.925396404           ~ 12 0
172 2FGL J1612.0+1403 AGN 16 12 07.5 +14 07 00           ~ 23 0
173 3FGL J1619.0-5014c gam 16 19 30.4 -50 14 59           ~ 7 0
174 2MASS J16233395-2317493 AG? 16 23 33.9388458907 -23 17 49.513772239           ~ 12 0
175 4FGL J1626.0-4917c BLL 16 26 02.0 -49 17 02           ~ 20 0
176 SDSS J163146.72+414632.6 BLL 16 31 46.7232416808 +41 46 32.742434568   20.18   19.86 19.68 ~ 15 0
177 3EG J1633-3216 gam 16 35 26.1 -32 49 44           ~ 12 0
178 SDSS J163728.13+300953.0 QSO 16 37 28.1287122219 +30 09 53.008442318           ~ 4 0
179 NVSS J163738+300507 BLL 16 37 38.2842205168 +30 05 07.269452066           ~ 23 1
180 FIRST J163739.2+301012 Bla 16 37 39.2098128432 +30 10 12.815625000           ~ 8 0
181 SPICY 39308 Y*? 16 38 00.916 -46 40 12.38           ~ 2 0
182 4FGL J1638.1-4641c gam 16 38 07.4 -46 41 22           ~ 4 0
183 1RXS J164456.2+185204 BL? 16 44 57.1595981203 +18 51 49.103403771           ~ 11 0
184 NVSS J164500+165510 Bla 16 44 59.8012085015 +16 55 12.286911033           ~ 12 0
185 NVSS J164804-154659 AGN 16 48 04.27382640 -15 47 02.6058480           ~ 18 0
186 NVSS J164859+483412 BLL 16 49 00.3485865419 +48 34 11.845502405           ~ 11 0
187 4FGL J1650.9-4420c gam 16 50 59.5 -44 20 12           ~ 6 0
188 SSTGLMC G341.1835-00.0358 AB? 16 51 24.92832 -44 21 43.9452           ~ 3 0
189 SUMSS J165153-724305 Bla 16 51 52.0676720099 -72 43 06.917523616           ~ 10 0
190 4FGL J1652.2-4516 gam 16 52 15.8 -45 16 56           ~ 6 0
191 XTE J1652-453 XB* 16 52 20.330 -45 20 39.99           ~ 56 1
192 4FGL J1700.2-4237c gam 17 00 15.0 -42 37 42           ~ 7 0
193 UCAC4 248-110757 Y*? 17 06 33.6758568912 -40 25 40.787907384       13.501   ~ 3 0
194 4FGL J1706.5-4023c gam 17 06 34.5 -40 23 05           ~ 7 0
195 4FGL J1714.6+3228 gam 17 14 37.4 +32 28 05           ~ 6 0
196 1RXS J171855.3-535056 BL? 17 18 56.4428705176 -53 50 43.256148672           ~ 9 0
197 4FGL J1728.8-5131 gam 17 28 52.2 -51 31 12           ~ 4 0
198 1FGL J1729.8-4148 gam 17 29 55.2 -41 48 15           ~ 12 0
199 2MASS J17333033+2236114 AGN 17 33 30.3190997835 +22 36 11.759550373           ~ 8 0
200 4FGL J1734.0-2933 gam 17 34 03 -29 33.1           ~ 11 0
201 2CXO J173411.3-293117 CV* 17 34 11.38 -29 31 17.8           ~ 4 0
202 4FGL J1739.5-2929 gam 17 39 30.6 -29 29 09           ~ 7 0
203 2RXP J174040.9-280852 HXB 17 40 41.2 -28 08 50           ~ 31 1
204 CXOU J174042.0-280724 X 17 40 42.05 -28 07 24.6           ~ 8 1
205 3FGL J1740.5-2642 gam 17 40 44.6 -26 40 37           ~ 15 0
206 4FGL J1742.5-2833 gam 17 42 32.0 -28 33 32           ~ 9 0
207 PSO J268.0405+36.1076 AGN 17 52 09.7353495996 +36 06 27.699554477           ~ 8 0
208 4FGL J1801.1-2626 gam 18 01 10.1 -26 26 23           ~ 5 0
209 V* KY Sgr No* 18 01 21.0229654320 -26 24 40.044608172           ~ 29 0
210 3FGL J1804.5-0850 Bz? 18 04 28.4 -08 52 10           ~ 15 0
211 3FGL J1813.6-6845 Q? 18 13 47.5 -68 46 43           ~ 15 0
212 9Y-MST J1821+6636 BLL 18 21 39.4 +66 36 33           ~ 15 0
213 MCG+11-22-047 Sy2 18 22 05.0120259514 +66 37 20.581718629   16 13.99     ~ 28 0
214 PSO J276.0370+12.5425 Psr 18 24 08.8915474213 +12 32 33.590077740           ~ 10 0
215 4FGL J1825.9-5614 gam 18 25 58.9 -56 14 47           ~ 6 0
216 2MASS J18264367-5614195 PM* 18 26 43.6807478504 -56 14 19.623459191           ~ 4 0
217 4FGL J1834.2-0827c gam 18 34 17.2 -08 27 31           ~ 5 0
218 4FGL J1836.9+4439 AGN 18 37 03.48639 +44 38 08.5968           ~ 8 0
219 ZTF J1838+3224 EB* 18 38 16.8242516396 +32 24 11.573814340           ~ 12 0
220 2MASS J18483829-6305358 AGN 18 48 38.2593265790 -63 05 35.646071217           ~ 7 0
221 4FGL J1855.2+0756 gam 18 55 15.0 +07 56 49           ~ 8 0
222 3FGL J1855.4+0454 gam 18 55 15.8 +04 56 34           ~ 12 0
223 NVSS J185606-122148 BL? 18 56 06.4023679195 -12 21 45.701471864           ~ 16 0
224 4FGL J1900.9+0538 gam 19 00 54.2 +05 38 10           ~ 6 0
225 2FGL J1904.8-0705 Bz? 19 05 15.39 -07 05 24.9           ~ 22 0
226 4FGL J1906.4-1757 gam 19 06 26.6 -17 57 03           ~ 11 0
227 4FGL J1910.8+6300 gam 19 10 51.7 +63 00 06           ~ 5 0
228 1RXS J192833.5+533900 AGN 19 28 33.5759796111 +53 39 02.456587696           ~ 5 0
229 4FGL J1948.9+3414 gam 19 48 54 +34 14.4           ~ 7 0
230 V* V1449 Cyg CV* 19 49 16.6588036767 +34 10 49.331052481           ~ 13 0
231 SUMSS J195512-503011 Bla 19 55 12.5799025427 -50 30 08.256903631           ~ 10 0
232 NVSS J200827+161846 Bla 20 08 27.8442810926 +16 18 42.717545092           ~ 10 0
233 SUMSS J201213-523253 BL? 20 12 13.7278951334 -52 32 51.128914327           ~ 9 0
234 4FGL J2018.0+7903 gam 20 18 03.8 +79 03 04           ~ 6 0
235 4FGL J2019.6+0616 gam 20 19 36.1 +06 16 17           ~ 6 0
236 NVSS J202201+361110 BL? 20 22 01.43832 +36 11 10.5108           ~ 14 1
237 4FGL J2022.3+0413 gam 20 22 23.5 +04 13 19           ~ 2 0
238 1RXS J203014.5-030725 Sy2 20 30 14.2782348158 -03 07 22.558121127   17.53   16.40   ~ 10 0
239 NVSS J203031+223439 BL? 20 30 31.3616464766 +22 34 38.692931262           ~ 18 0
240 4FGL J2032.3-0720 gam 20 32 22.2 -07 20 39           ~ 3 0
241 V* V1521 Cyg HXB 20 32 25.78 +40 57 27.9           WN4/5-6/7 2035 2
242 4FGL J2037.7-2230 gam 20 37 43.8 -22 31 00           ~ 3 0
243 SUMSS J204112-613949 Bla 20 41 12.0744289871 -61 39 49.360845593           ~ 11 0
244 4FGL J2042.1-5320 gam 20 42 08.7 -53 20 10           ~ 7 0
245 4FGL J2045.6+2455 gam 20 45 38.9 +24 55 23           ~ 7 0
246 PMN J2047-5412 Bla 20 47 00.7410669538 -54 12 45.531693820           ~ 14 1
247 PSO J313.4958+69.0888 EB* 20 53 59.0091040200 +69 05 19.794147353           ~ 4 0
248 3FGL J2054.3+6907 gam 20 54.2 +69 04           ~ 18 0
249 PSO J314.6536-18.5181 AGN 20 58 36.8616652437 -18 31 05.495717189           ~ 9 0
250 NVSS J210606+750926 BL? 21 06 05.4758570406 +75 09 20.780449041           ~ 11 0
251 ICRF J210931.8+353257 Sy1 21 09 31.8787167000 +35 32 57.597617256   15.7   14.7   ~ 66 2
252 NVSS J210936+395515 Bla 21 09 36.1688178798 +39 55 13.529796351           ~ 14 0
253 RX J2114.1+2132 rG 21 14 07.7613251760 +21 32 40.830049212           ~ 7 1
254 NVSS J211452-332533 Bla 21 14 52.0997455566 -33 25 33.608247816           ~ 13 0
255 FBQS J2120-0138 BL? 21 20 30.6021263712 -01 38 40.411511785           ~ 7 0
256 4FGL J2122.3+7653 gam 21 22 21.4 +76 53 19           ~ 6 0
257 Gaia DR3 1850329566758744832 WD? 21 28 59.3285548253 +30 37 34.362883644           ~ 2 0
258 4FGL J2128.9+3032 gam 21 28 59.9 +30 32 41           ~ 2 0
259 SUMSS J214429-563901 BLL 21 44 29.5683338470 -56 38 49.049553840           ~ 14 0
260 4FGL J2153.0-6442 gam 21 53 00.6 -64 42 39           ~ 3 0
261 4FGL J2159.6-4620 BL? 21 59 36.1238541905 -46 19 53.759407406           ~ 16 0
262 NVSS J220704+222234 BLL 22 07 04.1035680565 +22 22 31.365491918           ~ 15 0
263 NVSS J220722+274615 QSO 22 07 22.4142528233 +27 46 17.953395800           ~ 4 0
264 GSC 04608-01986 Y*O 22 11 11.2394504544 +79 18 00.031244040   12.5       K5V 8 0
265 4FGL J2212.9+7921c gam 22 12 56.8 +79 21 35           ~ 3 0
266 SDSS J222247.02+270102.5 QSO 22 22 47.023 +27 01 02.54           ~ 2 0
267 2MASS J22225384+1510548 BL? 22 22 53.8521512509 +15 10 54.703518803           ~ 11 0
268 4FGL J2223.0+2704 gam 22 23 01.9 +27 04 25           ~ 6 0
269 SDSS J222314.46+271024.8 QSO 22 23 14.467 +27 10 24.81           ~ 2 0
270 4FGL J2223.9+4128 gam 22 23 54.3 +41 28 55           ~ 2 0
271 NVSS J222553-080412 Bla 22 25 53.16741 -08 04 14.6144           ~ 14 0
272 SUMSS J223709-672619 Bla 22 37 09.7550211225 -67 26 13.386285756           ~ 16 0
273 4FGL J2237.8+2430 gam 22 37 49.8 +24 30 40           ~ 3 0
274 SDSS J223750.37+243248.5 QSO 22 37 50.3853211296 +24 32 48.462143532           ~ 5 0
275 3FGL J2237.5-8326 gam 22 42 01.8288330476 -83 27 44.705520942           ~ 12 0
276 1RXS J224747.3-585444 Bla 22 47 45.1870939011 -58 54 57.647641802           ~ 12 0
277 2MASS J22495520+5811497 Y*O 22 49 55.2282884958 +58 11 49.800955075           ~ 2 0
278 4FGL J2250.6+5809 gam 22 50 36.3 +58 09 04           ~ 6 0
279 NVSS J230352+555609 BLL 23 03 51.5689878056 +55 56 19.481755853           ~ 18 0
280 4FGL J2311.6-4427 BL? 23 11 46.0284325268 -44 32 20.553475771           ~ 11 0
281 4FGL J2317.6+6036c gam 23 17 39.2 +60 36 39           ~ 2 0
282 NVSS J231740+283952 BLL 23 17 40.2260413340 +28 39 55.781368802           ~ 20 1
283 2MASS J23265307-4127112 Bz? 23 26 53.0651282439 -41 27 10.976378715           ~ 19 0
284 NVSS J233129+443103 BL? 23 31 29.0594292594 +44 31 02.457600971           ~ 9 0
285 3FGL J2337.2-8425 AGN 23 36 27.6490458771 -84 26 51.896370602           ~ 21 0
286 NVSS J233730-290236 Bla 23 37 30.4572727280 -29 02 37.228703673           ~ 11 0
287 SDSS J233735.05+041028.6 QSO 23 37 35.057 +04 10 28.61           ~ 3 0
288 SDSS J233741.25+040736.8 QSO 23 37 41.254 +04 07 36.88           ~ 2 0
289 4FGL J2338.1+0411 gam 23 38 08.5 +04 11 14           ~ 6 0
290 SDSS J233833.50+041320.5 QSO 23 38 33.508 +04 13 20.58           ~ 3 0
291 4FGL J2351.4-2818 gam 23 51 28.5 -28 18 42           ~ 16 0
292 IC 5362 rG 23 51 36.7383942744 -28 21 53.942400288   13.81   12.36   ~ 52 1
293 NVSS J235319+313616 BLL 23 53 19.5469334640 +31 36 16.778237250       19.90   ~ 13 1

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