Swift-XRT Survey of Fermi Unassociated Sources


These results are part of the Swift program to follow-up Fermi unassociated sources in an attempt to find X-ray counterparts to the unidentified gamma-ray sources. As new observations are performed, these pages will be updated in nearly real time. Please use these results as a guide and proceed with caution when using them in a publication since they are the result of an automated analysis.

When using these data and results in publications, please reference M.C. Stroh & A.D. Falcone 2013, ApJS, 207, 28; arXiv: 1305.4949 for a description of many of the analysis techniques used to reduce these data (note: a more detailed paper describing the complete data set and analysis is forthcoming). Please contact Abe Falcone and Michael Stroh at unassociated@swift.psu.edu if you have any questions about the program or the analysis, or to simply to let us know that you've made use of these data.


Caution: For completeness, sources are listed if the "detection" exceeds 3 sigma. The significances and images are shown so you can make more stringent significance cuts, if desired.

3FGL J1837.3-2403

Field

Detected Excesses

Swift-XRT image of the field for 3FGL J1837.3-2403 Swift-XRT detections in the field for 3FGL J1837.3-2403

Detected Excesses (SNR(Sosta) > 3.0)

# R.A. (J2000) Dec. (J2000) Pos. Error (") Rate (cts/s) Counts SNR (Detect) SNR (Sosta)
1 18 36 47.12 -23 45 46.79 4.10 (2.2 ± 0.3) x 10-3 69 6.754 7.024
2 18 36 24.60 -23 54 36.82 3.86 (2.9 ± 0.4) x 10-3 96 7.431 6.604
3 18 36 59.46 -24 00 27.91 4.10 (1.9 ± 0.3) x 10-3 82 6.013 5.975
4 18 36 27.45 -23 45 11.65 4.19 (9 ± 3) x 10-4 35 4.016 3.756
5 18 36 54.29 -23 52 50.10 4.17 (8 ± 2) x 10-4 53 3.549 3.682
6 18 36 45.36 -23 51 56.84 4.22 (8 ± 2) x 10-4 37 3.438 3.625
7 18 36 15.39 -23 46 13.94 4.12 (7 ± 2) x 10-4 25 3.154 3.220
8 18 36 53.19 -23 49 48.96 4.38 (7 ± 2) x 10-4 27 2.855 3.219
9 18 35 58.92 -23 55 03.23 4.15 (7 ± 2) x 10-4 35 2.984 3.060
10 18 37 00.48 -23 58 40.85 4.24 (7 ± 2) x 10-4 60 3.005 3.045

Rejected Excesses (Due to Overlaps or SNR(Sosta) < 3.0)

# R.A. (J2000) Dec. (J2000) Pos. Error (") Rate (cts/s) Counts SNR (Detect) SNR (Sosta)
1 18 36 23.32 -24 02 28.02 4.22 (6 ± 2) x 10-4 46 3.317 2.839
2 18 36 00.19 -23 47 28.44 4.10 (6 ± 2) x 10-4 29 2.880 2.794
3 18 36 48.80 -23 48 16.05 4.28 (6 ± 2) x 10-4 27 2.714 2.737
4 18 36 24.60 -23 54 36.82 3.86 (5 ± 3) x 10-4 96 2.793 1.972
5 18 36 24.60 -23 54 36.84 3.86 (6 ± 3) x 10-4 98 2.807 1.952

X-Ray and Gamma Ray Catalogs

More Catalogs

Swift-XRT image with known X-ray and gamma ray sources for 3FGL J1837.3-2403 Swift-XRT image with known radio, optical and UV sources for 3FGL J1837.3-2403

Known X-Ray and Gamma Ray Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Observatory/Database Table
1 4XMM J183718.7-235957 18 37 18.72 -23 59 57.84 3.61 XMM-NEWTON
2 2CXO J183725.1-235927 18 37 25.13 -23 59 27.24 4.34 CHANDRA
3 4XMM J183724.7-235820 18 37 24.72 -23 58 20.64 5.38 XMM-NEWTON
4 X183659.32-240027.5 18 36 59.33 -24 00 27.36 5.52 CHANDRA
4XMM J183659.3-240026 18 36 59.35 -24 00 26.28 5.52 XMM-NEWTON
2CXO J183659.2-240026 18 36 59.28 -24 00 26.64 5.53 CHANDRA
5 2CXO J183707.8-235800 18 37 07.82 -23 58 00.48 6.15 CHANDRA
4XMM J183700.5-235827 18 37 00.60 -23 58 27.48 6.66 XMM-NEWTON
6 2CXO J183700.5-235827 18 37 00.58 -23 58 27.84 6.66 CHANDRA
X183700.46-235829.0 18 37 00.46 -23 58 28.92 6.66 CHANDRA
7 4XMM J183649.2-240518 18 36 49.30 -24 05 18.96 7.06 XMM-NEWTON
8 1WGA J1837.8-2403 18 37 52.51 -24 03 50.04 7.60 ROSAT
4XMM J183700.8-235611 18 37 00.84 -23 56 11.76 8.49 XMM-NEWTON
9 2CXO J183700.6-235612 18 37 00.65 -23 56 12.84 8.50 CHANDRA
X183700.55-235612.0 18 37 00.55 -23 56 12.12 8.52 CHANDRA
10 1WGA J1837.0-2411 18 37 01.61 -24 11 20.76 8.75 ROSAT
11 4XMM J183722.3-235446 18 37 22.32 -23 54 46.44 8.83 XMM-NEWTON
12 4XMM J183645.6-235834 18 36 45.65 -23 58 34.32 9.16 XMM-NEWTON
13 4XMM J183655.9-235517 18 36 55.97 -23 55 17.40 9.84 XMM-NEWTON
14 X183642.95-235658.9 18 36 42.96 -23 56 58.92 10.59 CHANDRA
CXOGSG J183642.9-235658 18 36 42.91 -23 56 58.56 10.60 CHANDRA
4XMM J183642.9-235658 18 36 42.91 -23 56 58.20 10.61 XMM-NEWTON
4XMM J183633.6-240623 18 36 33.67 -24 06 23.76 10.78 XMM-NEWTON
15 2CXO J183633.0-240620 18 36 33.02 -24 06 20.88 10.91 CHANDRA
2CXO J183631.4-240627 18 36 31.46 -24 06 27.72 11.28 CHANDRA
16 4XMM J183629.7-240156 18 36 29.74 -24 01 56.28 11.42 XMM-NEWTON
17 2CXO J183629.4-240123 18 36 29.47 -24 01 23.16 11.57 CHANDRA
18 4XMM J183653.7-235253 18 36 53.78 -23 52 53.76 12.16 XMM-NEWTON
4XMM J183627.1-240638 18 36 27.17 -24 06 38.16 12.28 XMM-NEWTON
19 2CXO J183626.7-240637 18 36 26.76 -24 06 37.80 12.36 CHANDRA
4XMM J183654.0-235236 18 36 54.10 -23 52 36.84 12.38 XMM-NEWTON
20 CXOGSG J183640.2-235427 18 36 40.25 -23 54 27.36 12.75 CHANDRA
21 2CXO J183638.3-235447 18 36 38.40 -23 54 47.16 12.82 CHANDRA
CXOGSG J183638.3-235447 18 36 38.40 -23 54 47.16 12.82 CHANDRA
X183638.38-235447.4 18 36 38.38 -23 54 47.52 12.82 CHANDRA
4XMM J183638.3-235447 18 36 38.38 -23 54 47.16 12.82 XMM-NEWTON
CXOGSG J183636.5-235501 18 36 36.50 -23 55 01.92 12.97 CHANDRA
22 X183633.15-235547.0 18 36 33.14 -23 55 46.92 13.10 CHANDRA
4XMM J183639.2-235346 18 36 39.19 -23 53 47.04 13.40 XMM-NEWTON
23 2CXO J183639.0-235346 18 36 39.10 -23 53 46.32 13.43 CHANDRA
X183639.06-235346.6 18 36 39.07 -23 53 46.68 13.43 CHANDRA
CXOGSG J183639.0-235346 18 36 39.07 -23 53 46.68 13.43 CHANDRA
4XMM J183631.6-235527 18 36 31.66 -23 55 27.84 13.56 XMM-NEWTON
4XMM J183628.3-235624 18 36 28.37 -23 56 24.36 13.66 XMM-NEWTON
24 2CXO J183628.3-235624 18 36 28.32 -23 56 24.72 13.66 CHANDRA
CXOGSG J183628.3-235624 18 36 28.30 -23 56 25.08 13.66 CHANDRA
X183628.29-235624.6 18 36 28.30 -23 56 24.72 13.67 CHANDRA
1BMW 183645.4-235200 18 36 45.43 -23 52 00.12 13.91 ROSAT
25 4XMM J183645.3-235158 18 36 45.38 -23 51 58.68 13.94 XMM-NEWTON
26 X183628.26-235535.2 18 36 28.27 -23 55 35.04 14.12 CHANDRA
2CXO J183628.2-235535 18 36 28.25 -23 55 35.04 14.12 CHANDRA
CXOGSG J183628.2-235535 18 36 28.27 -23 55 35.04 14.12 CHANDRA
4XMM J183628.1-235534 18 36 28.18 -23 55 33.96 14.15 XMM-NEWTON
27 X183632.88-235305.4 18 36 32.88 -23 53 05.28 14.91 CHANDRA
CXOGSG J183632.8-235305 18 36 32.88 -23 53 05.28 14.91 CHANDRA
2CXO J183632.8-235305 18 36 32.88 -23 53 05.28 14.91 CHANDRA
28 X183627.20-235426.1 18 36 27.19 -23 54 25.92 15.00 CHANDRA
2CXO J183627.2-235425 18 36 27.19 -23 54 25.92 15.00 CHANDRA
CXOGSG J183627.2-235425 18 36 27.19 -23 54 25.92 15.00 CHANDRA
4XMM J183626.9-235427 18 36 26.95 -23 54 27.36 15.03 XMM-NEWTON
29 2CXO J183633.8-235137 18 36 33.82 -23 51 37.44 15.83 CHANDRA
X183633.80-235137.5 18 36 33.79 -23 51 37.44 15.83 CHANDRA
CXOGSG J183633.8-235137 18 36 33.79 -23 51 37.44 15.83 CHANDRA

Known Radio, Optical and UV Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Database Table
1 CGMW 4-1982 18 37 35.40 -24 01 04.08 4.46 CGMW
PGC 207399 18 37 35.40 -24 01 04.08 4.46 PGC2003
2 CGMW 4-1970 18 37 31.70 -23 59 08.16 5.27 CGMW
PGC 207387 18 37 31.70 -23 59 08.16 5.28 PGC2003
3 NVSS J183709-240929 18 37 09.41 -24 09 29.88 6.33 NVSS
4 V4191 Sgr 18 37 13.32 -23 55 15.24 8.43 GCVS
5 PPM 268647 18 36 41.74 -24 03 47.52 8.57 PPM
CD-2414520 18 36 41.71 -24 03 47.16 8.57 ACRS
SAO 187039 18 36 41.69 -24 03 47.16 8.58 SAO
6 PPM 734204 18 38 02.71 -24 02 53.16 9.95 PPM
7 NVSS J183801-240705 18 38 01.01 -24 07 05.88 10.16 NVSS
8 NSV 11084 18 36 41.11 -23 58 18.84 10.18 GCVSNSVARS
9 NVSS J183727-241357 18 37 27.70 -24 13 57.00 10.55 NVSS
10 NVSS J183633-240624 18 36 33.50 -24 06 24.12 10.82 NVSS
1833-241 18 36 33.60 -24 06 29.16 10.83 MRC
TGSSADR J183633.3-240623 18 36 33.41 -24 06 23.04 10.84 GMRTAS150M
TXS 1833-241 18 36 32.71 -24 06 24.12 10.99 TEXAS
11 NVSS J183653-235352 18 36 53.71 -23 53 52.08 11.33 NVSS
12 PMN J1836-2406 18 36 30.79 -24 06 16.92 11.38 PMN
13 MSH 18-211 18 36 39.10 -23 56 26.88 11.61 DIXON
14 NVSS J183752-241233 18 37 52.39 -24 12 33.84 11.74 NVSS
TGSSADR J183752.5-241233 18 37 52.61 -24 12 33.12 11.76 GMRTAS150M
15 NVSS J183808-240927 18 38 08.21 -24 09 28.08 12.62 NVSS
16 NVSS J183810-240845 18 38 10.10 -24 08 44.88 12.70 NVSS
17 PGC 207264 18 36 38.50 -24 12 43.92 13.05 PGC2003
18 CV J183628.9-235625 18 36 28.90 -23 56 25.80 13.54 CVCAT
19 KL Sgr 18 38 03.58 -23 54 10.08 13.82 GCVS
20 PGC 207280 18 36 43.20 -24 14 45.96 13.89 PGC2003
21 NVSS J183805-241243 18 38 05.21 -24 12 43.92 13.92 NVSS
22 CV J183645.4-235158 18 36 45.41 -23 51 58.32 13.94 CVCAT
23 WDS J18365-2355 18 36 30.00 -23 55 00.12 14.15 WDS
24 CD-2414513 18 36 27.86 -23 55 13.80 14.40 ACRS
25 NVSS J183629-241230 18 36 29.50 -24 12 30.96 14.45 NVSS
26 WDS J18365-2354 BC 18 36 30.00 -23 53 60.00 14.77 WDS
WDS J18365-2354 AB 18 36 30.00 -23 53 60.00 14.77 WDS
27 OU-256 18 36 39.60 -24 15 27.00 14.93 DIXON
28 WDS J18365-2353 18 36 30.00 -23 52 59.88 15.44 WDS

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