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 J0421.6+1950

Field

Detected Excesses

Swift-XRT image of the field for 3FGL J0421.6+1950 Swift-XRT detections in the field for 3FGL J0421.6+1950

Detected Excesses (SNR(Sosta) > 3.0)

# R.A. (J2000) Dec. (J2000) Pos. Error (") Rate (cts/s) Counts SNR (Detect) SNR (Sosta)
1 04 22 18.20 +19 50 56.94 3.63 (1.08 ± 0.04) x 10-1 644 23.960 24.410
2 04 22 08.60 +19 53 29.44 5.76 (3.1 ± 0.8) x 10-3 20 3.538 3.767

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 04 21 29.77 +19 52 59.47 5.96 (1.5 ± 0.7) x 10-3 17 2.443 2.321
2 04 22 18.20 +19 50 56.94 3.63 (3 ± 7) x 10-4 644 2.703 0.446
3 04 22 18.20 +19 50 56.94 3.63 N/A 650 2.476 N/A

X-Ray and Gamma Ray Catalogs

More Catalogs

Swift-XRT image with known X-ray and gamma ray sources for 3FGL J0421.6+1950 Swift-XRT image with known radio, optical and UV sources for 3FGL J0421.6+1950

Known X-Ray and Gamma Ray Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Observatory/Database Table
1 3XMM J042147.2+194514 04 21 47.23 +19 45 14.76 6.06 XMM-NEWTON
2 3XMM J042151.4+194510 04 21 51.41 +19 45 10.08 6.59 XMM-NEWTON
3 3XMM J042124.6+194334 04 21 24.82 +19 43 36.12 7.76 XMM-NEWTON
4 3XMM J042151.4+194348 04 21 51.48 +19 43 48.36 7.79 XMM-NEWTON
3XMM J042124.6+194334 04 21 24.65 +19 43 35.04 7.79 XMM-NEWTON
3XMM J042124.6+194334 04 21 24.72 +19 43 33.96 7.80 XMM-NEWTON
3XMM J042124.6+194334 04 21 24.46 +19 43 32.52 7.85 XMM-NEWTON
XEST 01-013 04 21 24.31 +19 43 32.88 7.85 XMM-NEWTON
3XMM J042152.1+194322 04 21 52.10 +19 43 22.44 8.25 XMM-NEWTON
5 3XMM J042152.9+194241 04 21 52.90 +19 42 41.04 8.95 XMM-NEWTON
6 3XMM J042147.3+194209 04 21 47.38 +19 42 09.36 8.99 XMM-NEWTON
7 3XMM J042200.8+194339 04 22 00.77 +19 43 40.08 9.07 XMM-NEWTON
8 XEST 01-012 04 21 23.69 +19 42 17.28 9.08 XMM-NEWTON
9 XEST 01-041 04 21 57.60 +19 43 07.68 9.08 XMM-NEWTON
XEST 01-048 04 22 00.82 +19 43 39.00 9.09 XMM-NEWTON
3XMM J042200.8+194339 04 22 00.96 +19 43 40.44 9.10 XMM-NEWTON
3XMM J042200.8+194339 04 22 00.94 +19 43 39.00 9.11 XMM-NEWTON
3XMM J042157.8+194308 04 21 57.89 +19 43 08.04 9.11 XMM-NEWTON
10 3XMM J042206.4+194436 04 22 06.24 +19 44 37.32 9.25 XMM-NEWTON
XEST 01-056 04 22 06.31 +19 44 36.24 9.28 XMM-NEWTON
3XMM J042206.4+194436 04 22 06.19 +19 44 33.36 9.29 XMM-NEWTON
3XMM J042206.4+194436 04 22 06.48 +19 44 36.60 9.31 XMM-NEWTON
3XMM J042206.4+194436 04 22 06.60 +19 44 37.32 9.32 XMM-NEWTON
11 1WGA J0422.2+1950 04 22 17.21 +19 50 42.72 9.45 ROSAT
2RXP J042217.8+195045 04 22 17.78 +19 50 44.88 9.59 ROSAT
MS (1E) 0419.3+1943 04 22 18.00 +19 50 53.88 9.64 null
2RXS J042218.0+195042 04 22 18.29 +19 50 43.08 9.65 ROSAT
2RXS J042218.0+195042 04 22 18.29 +19 50 43.08 9.65 ROSAT
1RXS J042218.2+195047 04 22 18.19 +19 50 47.04 9.69 ROSAT
1RXS J042218.2+195047 04 22 18.19 +19 50 47.04 9.69 ROSAT
2RXP J042218.3+195056 04 22 18.29 +19 50 56.04 9.71 ROSAT
1WGA J0422.3+1950 04 22 18.29 +19 50 47.40 9.71 ROSAT
1WGA J0422.3+1950 04 22 18.29 +19 50 45.24 9.71 ROSAT
[MML2015] 5BZB J0422+1950 04 22 18.31 +19 50 54.96 9.72 null
1RXS J042218.2+195047 04 22 18.34 +19 50 55.68 9.72 ROSAT
2E 0419.3+1943 04 22 18.34 +19 50 27.24 9.73 EINSTEIN
2RXP J042218.4+195048 04 22 18.38 +19 50 48.12 9.73 ROSAT
MS0419.3+1943 04 22 18.41 +19 50 53.16 9.74 EINSTEIN
2E 0419.3+1943 04 22 18.38 +19 50 27.24 9.74 EINSTEIN
1WGA J0422.3+1950 04 22 18.50 +19 50 57.84 9.76 ROSAT
2RXP J042218.6+195100 04 22 18.58 +19 51 00.00 9.78 ROSAT
2E 0419.3+1943 04 22 18.96 +19 50 55.32 9.86 EINSTEIN
2E 0419.3+1943 04 22 18.96 +19 50 54.96 9.86 EINSTEIN
12 3XMM J042153.1+194122 04 21 53.11 +19 41 22.56 10.17 XMM-NEWTON
13 3XMM J042207.9+194229 04 22 07.90 +19 42 29.16 11.05 XMM-NEWTON
14 3XMM J042154.0+194004 04 21 54.41 +19 40 04.44 11.46 XMM-NEWTON
15 3XMM J042151.9+193952 04 21 51.94 +19 39 52.20 11.49 XMM-NEWTON
16 3XMM J042139.0+193913 04 21 39.17 +19 39 13.68 11.60 XMM-NEWTON
3XMM J042139.0+193913 04 21 39.10 +19 39 12.60 11.61 XMM-NEWTON
XEST 01-025 04 21 38.86 +19 39 12.24 11.62 XMM-NEWTON
17 3XMM J042136.9+193910 04 21 36.89 +19 39 10.08 11.64 XMM-NEWTON
XEST 01-024 04 21 36.77 +19 39 10.08 11.65 XMM-NEWTON
3XMM J042136.9+193910 04 21 37.61 +19 39 09.72 11.65 XMM-NEWTON
3XMM J042139.8+193907 04 21 39.84 +19 39 07.92 11.70 XMM-NEWTON
18 3XMM J042117.3+193953 04 21 17.30 +19 39 53.28 11.87 XMM-NEWTON
3XMM J042117.3+193953 04 21 17.33 +19 39 52.92 11.87 XMM-NEWTON
3XMM J042117.3+193953 04 21 17.33 +19 39 52.92 11.87 XMM-NEWTON
XEST 01-010 04 21 17.33 +19 39 52.92 11.87 XMM-NEWTON
3XMM J042117.3+193953 04 21 17.33 +19 39 52.92 11.87 XMM-NEWTON
19 3XMM J042159.1+194003 04 21 59.90 +19 40 04.08 11.94 XMM-NEWTON
3XMM J042159.1+194003 04 21 59.14 +19 40 03.72 11.95 XMM-NEWTON
3XMM J042159.1+194003 04 21 59.81 +19 40 03.00 11.95 XMM-NEWTON
XEST 01-044 04 21 59.21 +19 40 02.64 11.97 XMM-NEWTON
3XMM J042117.3+193953 04 21 16.70 +19 39 49.68 11.98 XMM-NEWTON
3XMM J042159.1+194003 04 21 59.47 +19 40 02.28 12.00 XMM-NEWTON
20 XEST 01-072 04 22 22.39 +19 45 14.40 12.04 XMM-NEWTON
3XMM J042222.5+194514 04 22 22.46 +19 45 13.68 12.06 XMM-NEWTON
3XMM J042222.5+194514 04 22 22.51 +19 45 14.76 12.07 XMM-NEWTON
3XMM J042222.5+194514 04 22 22.58 +19 45 15.12 12.08 XMM-NEWTON
3XMM J042222.5+194514 04 22 22.58 +19 45 15.12 12.08 XMM-NEWTON
21 XEST 01-037 04 21 50.47 +19 38 56.40 12.29 XMM-NEWTON
3XMM J042150.5+193856 04 21 50.62 +19 38 56.76 12.29 XMM-NEWTON
3XMM J042150.5+193856 04 21 50.50 +19 38 56.04 12.29 XMM-NEWTON
3XMM J042150.5+193856 04 21 50.52 +19 38 56.04 12.30 XMM-NEWTON
3XMM J042150.5+193856 04 21 50.62 +19 38 56.04 12.30 XMM-NEWTON
22 XEST 01-052 04 22 04.51 +19 39 40.32 12.88 XMM-NEWTON
3XMM J042204.4+193937 04 22 04.39 +19 39 38.16 12.90 XMM-NEWTON
3XMM J042204.4+193937 04 22 04.61 +19 39 36.72 12.95 XMM-NEWTON
23 3XMM J042219.0+194203 04 22 18.98 +19 42 07.92 13.15 XMM-NEWTON
3XMM J042219.0+194203 04 22 19.01 +19 42 04.32 13.19 XMM-NEWTON
XEST 01-068 04 22 18.96 +19 42 03.60 13.19 XMM-NEWTON
3XMM J042219.0+194203 04 22 18.94 +19 42 03.24 13.19 XMM-NEWTON
3XMM J042219.0+194203 04 22 19.20 +19 41 59.28 13.28 XMM-NEWTON
24 3XMM J042226.1+194053 04 22 26.11 +19 40 52.32 15.24 XMM-NEWTON
3XMM J042226.1+194053 04 22 26.21 +19 40 53.76 15.24 XMM-NEWTON
XEST 01-081 04 22 26.90 +19 40 51.24 15.25 XMM-NEWTON

Known Radio, Optical and UV Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Database Table
1 NVSS J042132+194802 04 21 32.50 +19 48 02.16 2.97 NVSS
TGSSADR J042132.5+194758 04 21 32.59 +19 47 57.84 3.03 GMRTAS150M
2 NVSS J042144+195401 04 21 44.81 +19 54 02.16 3.71 NVSS
TGSSADR J042144.8+195403 04 21 44.81 +19 54 03.96 3.73 GMRTAS150M
3 NVSS J042148+194703 04 21 48.70 +19 47 03.84 4.65 NVSS
4 NVSS J042158+194808 04 21 58.20 +19 48 09.00 5.65 NVSS
TGSSADR J042158.3+194806 04 21 58.39 +19 48 06.12 5.70 GMRTAS150M
5 NVSS J042203+195323 04 22 03.00 +19 53 22.92 6.63 NVSS
MS (1E) 0419.3+1943 04 22 18.00 +19 50 53.88 9.64 XRAYSELBLL
TGSSADR J042127.3+194123 04 21 27.41 +19 41 24.00 9.69 GMRTAS150M
6 NVSS J042127+194123 04 21 27.19 +19 41 22.92 9.70 NVSS
[MML2015] 5BZB J0422+1950 04 22 18.29 +19 50 54.96 9.72 ROMABZCAT
7 NVSS J042218+195055 04 22 18.29 +19 50 56.04 9.72 NVSS
8 NVSS J042122+200053 04 21 22.10 +20 00 54.00 10.67 NVSS
9 NVSS J042129+193923 04 21 28.99 +19 39 24.12 11.57 NVSS
10 NVSS J042201+200133 04 22 01.30 +20 01 32.88 12.16 NVSS
11 NVSS J042103+200245 04 21 03.91 +20 02 45.96 14.26 NVSS

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