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 J1918.0+0331

Field

Detected Excesses
Swift-XRT image of the field for 4FGL J1918.0+0331 Swift-XRT detections in the field for 4FGL J1918.0+0331

Detected Excesses (SNR(Sosta) > 3.0)

# R.A. (J2000) Dec. (J2000) Pos. Error (") Rate (cts/s) Counts SNR (Detect) SNR (Sosta)
1 19 17 43.61 +03 33 15.56 4.30 (1.8 ± 0.2) x 10-2 89 8.667 8.663
2 19 18 03.57 +03 30 29.91 4.46 (1.5 ± 0.2) x 10-2 77 7.539 7.576
3 19 17 34.14 +03 35 28.41 5.00 (5.1 ± 1.2) x 10-3 29 4.828 4.270

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 19 17 21.98 +03 29 36.27 5.89 (1.6 ± 0.7) x 10-3 13 2.440 2.198

X-Ray and Gamma Ray Catalogs

More Catalogs
Swift-XRT image with known X-ray and gamma ray sources for 4FGL J1918.0+0331 Swift-XRT image with known radio, optical and UV sources for 4FGL J1918.0+0331

Known X-Ray and Gamma Ray Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Observatory/Database Table
1 2RXS J191803.6+033034 19 18 03.67 +03 30 34.56 0.73 ROSAT
2 1RXS J191801.7+032802 19 18 01.70 +03 28 01.92 3.24 ROSAT

Known Radio, Optical and UV Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Database Table
TGSSADR J191803.9+033034 19 18 03.91 +03 30 33.84 0.76 GMRTAS150M
1 NVSS J191803+033032 19 18 03.79 +03 30 33.12 0.77 NVSS
GB6 J1918+0330 19 18 02.21 +03 30 15.84 1.00 GB6
QORG J191745.6+033219 19 17 45.60 +03 32 18.96 4.38 QORGCAT
2 NVSS J191745+033218 19 17 45.60 +03 32 18.96 4.38 NVSS
3 NVSS J191754+032704 19 17 54.91 +03 27 05.04 4.60 NVSS
TGSSADR J191754.9+032704 19 17 54.91 +03 27 03.96 4.61 GMRTAS150M
4 NVSS J191758+033650 19 17 58.20 +03 36 51.12 5.69 NVSS
5 SAO 124474 19 17 34.58 +03 35 29.40 8.17 SAO
PPM 167564 19 17 34.54 +03 35 29.76 8.19 PPM
BD+03 3965 19 17 34.54 +03 35 29.76 8.19 ACRS
6 NVSS J191801+033929 19 18 01.70 +03 39 29.16 8.23 NVSS
7 NVSS J191736+033841 19 17 36.41 +03 38 40.92 9.90 NVSS
8 NVSS J191722+032949 19 17 22.90 +03 29 48.84 10.01 NVSS
TGSSADR J191843.0+033014 19 18 43.10 +03 30 15.12 10.14 GMRTAS150M
9 NVSS J191843+033015 19 18 43.10 +03 30 15.84 10.16 NVSS
TGSSADR J191726.7+033703 19 17 26.81 +03 37 04.08 10.67 GMRTAS150M
10 NVSS J191726+033704 19 17 26.71 +03 37 05.16 10.70 NVSS
11 NVSS J191728+032255 19 17 28.99 +03 22 55.92 11.82 NVSS
12 NVSS J191718+033614 19 17 18.79 +03 36 15.12 12.03 NVSS
TGSSADR J191718.7+033613 19 17 18.70 +03 36 14.04 12.03 GMRTAS150M
13 NVSS J191845+032557 19 18 46.01 +03 25 58.08 12.05 NVSS
14 NSV 11894 19 18 45.10 +03 24 33.12 12.55 GCVSNSVARS
15 NVSS J191841+032129 19 18 41.59 +03 21 29.88 13.78 NVSS
16 DA477 19 17 15.10 +03 23 26.16 14.21 DIXON
17 NVSS J191839+031943 19 18 39.10 +03 19 44.04 14.70 NVSS
TGSSADR J191839.1+031943 19 18 39.19 +03 19 42.96 14.71 GMRTAS150M

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