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.

4FGL J2118.3+4055

Field

Detected Excesses
Swift-XRT image of the field for 4FGL J2118.3+4055 Swift-XRT detections in the field for 4FGL J2118.3+4055

Detected Excesses (SNR(Sosta) > 3.0)

# R.A. (J2000) Dec. (J2000) Pos. Error (") Rate (cts/s) Counts SNR (Detect) SNR (Sosta)
1 21 18 12.07 +40 50 32.29 4.78 (1.3 ± 0.2) x 10-2 51 6.451 6.437
2 21 17 31.40 +40 55 02.76 5.64 (5.8 ± 1.2) x 10-3 26 4.383 4.713
3 21 18 55.39 +41 02 26.92 6.41 (3.3 ± 1.0) x 10-3 16 3.341 3.429

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 21 18 35.97 +40 52 56.19 5.49 (3.2 ± 1.1) x 10-3 23 3.257 2.998
2 21 18 48.32 +40 59 56.41 6.21 (2.3 ± 0.9) x 10-3 11 2.688 2.598

X-Ray and Gamma Ray Catalogs

More Catalogs
Swift-XRT image with known X-ray and gamma ray sources for 4FGL J2118.3+4055 Swift-XRT image with known radio, optical and UV sources for 4FGL J2118.3+4055

Known X-Ray and Gamma Ray Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Observatory/Database Table
1 1RXS J211811.3+405907 21 18 11.30 +40 59 07.08 4.16 ROSAT
2 1RXS J211857.2+405003 21 18 57.19 +40 50 03.12 8.65 ROSAT
3 2RXS J211857.9+404640 21 18 57.94 +40 46 40.80 11.14 ROSAT
1RXS J211858.0+404640 21 18 58.01 +40 46 40.44 11.16 ROSAT

Known Radio, Optical and UV Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Database Table
1 NVSS J211820+405726 21 18 20.90 +40 57 27.00 2.04 NVSS
2 NVSS J211812+405034 21 18 12.31 +40 50 35.16 5.12 NVSS
3 NVSS J211802+405009 21 18 03.00 +40 50 08.88 6.29 NVSS
WN 2116.1+4037 21 18 03.00 +40 50 08.88 6.29 WENSS
4 V1067 Cyg 21 18 48.24 +41 00 00.72 6.86 GCVS
5 WDS J21189+4102 AC 21 18 54.00 +41 01 59.88 9.03 WDS
WDS J21189+4102 AB 21 18 54.00 +41 01 59.88 9.03 WDS
6 NVSS J211821+404613 21 18 21.31 +40 46 14.16 9.18 NVSS
Rns 56557 21 18 55.32 +41 02 25.80 9.51 CPSTARS
HIP 105229 21 18 55.32 +41 02 25.80 9.52 HIPPARCOS
7 HD 203096 21 18 55.32 +41 02 26.16 9.52 HIC
BD+40 4485 21 18 55.37 +41 02 26.16 9.52 ACRS
PPM 61269 21 18 55.34 +41 02 26.16 9.52 PPM
HR 8155 21 18 55.30 +41 02 26.88 9.52 BSC5P
SAO 50699 21 18 55.32 +41 02 26.88 9.53 SAO
8 NVSS J211747+410252 21 17 47.59 +41 02 52.08 9.81 NVSS
9 NVSS J211746+404600 21 17 46.39 +40 46 00.84 11.48 NVSS
10 V1665 Cyg 21 19 20.71 +40 57 55.08 11.49 GCVS
11 WDS J21192+4102 21 19 12.00 +41 01 59.88 11.62 WDS
12 NVSS J211922+405141 21 19 22.70 +40 51 42.12 12.18 NVSS

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