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 J1855.4+0454

Field

Detected Excesses

Swift-XRT image of the field for 3FGL J1855.4+0454 Swift-XRT detections in the field for 3FGL J1855.4+0454

Detected Excesses (SNR(Sosta) > 3.0)

# R.A. (J2000) Dec. (J2000) Pos. Error (") Rate (cts/s) Counts SNR (Detect) SNR (Sosta)
1 18 55 02.92 +04 59 45.25 4.51 (2.1 ± 0.3) x 10-2 68 8.124 7.751

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 55 24.69 +05 03 52.71 7.97 (3.1 ± 1.1) x 10-3 9 2.706 2.840
2 18 55 09.52 +04 57 29.12 6.93 (2.5 ± 1.1) x 10-3 9 2.424 2.324
3 18 55 06.74 +04 45 49.38 9.05 (2.5 ± 1.1) x 10-3 6 2.213 2.249

X-Ray and Gamma Ray Catalogs

More Catalogs

Swift-XRT image with known X-ray and gamma ray sources for 3FGL J1855.4+0454 Swift-XRT image with known radio, optical and UV sources for 3FGL J1855.4+0454

Known X-Ray and Gamma Ray Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Observatory/Database Table
1 3XMM J185531.5+045432 18 55 31.51 +04 54 32.40 1.49 XMM-NEWTON
2 3XMM J185520.9+045202 18 55 20.95 +04 52 02.64 2.89 XMM-NEWTON
3 3XMM J185538.8+045510 18 55 38.81 +04 55 10.56 3.34 XMM-NEWTON
4 3XMM J185541.9+045523 18 55 41.98 +04 55 23.52 4.15 XMM-NEWTON
5 3XMM J185545.7+045324 18 55 45.74 +04 53 24.00 5.20 XMM-NEWTON
6 3XMM J185547.1+045647 18 55 47.16 +04 56 47.76 5.78 XMM-NEWTON
7 3XMM J185546.1+045129 18 55 46.20 +04 51 29.88 6.06 XMM-NEWTON
8 3XMM J185556.2+045228 18 55 56.28 +04 52 28.56 7.98 XMM-NEWTON
9 3XMM J185556.9+045751 18 55 56.95 +04 57 51.12 8.44 XMM-NEWTON
10 3XMM J185607.9+045432 18 56 07.92 +04 54 32.40 10.56 XMM-NEWTON
11 3XMM J185607.2+045719 18 56 07.22 +04 57 19.08 10.71 XMM-NEWTON
12 3XMM J185613.0+045443 18 56 13.01 +04 54 43.20 11.82 XMM-NEWTON
13 3XMM J185612.6+050552 18 56 12.62 +05 05 53.16 16.21 XMM-NEWTON

Known Radio, Optical and UV Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Database Table
1 NVSS J185516+045159 18 55 16.70 +04 52 00.12 3.48 NVSS
2 NVSS J185508+045504 18 55 08.59 +04 55 05.16 4.24 NVSS
3 [SPT2015] VLA J1855+0450 18 55 54.60 +04 50 34.08 8.34 FER2FUSRID
[PME2013] J1855+0450 18 55 54.70 +04 50 35.16 8.35 AT2FGLUS
4 VLSSr J185534.7+050314 18 55 34.70 +05 03 14.04 8.84 VLSSR
5 NVSS J185444+045724 18 54 44.40 +04 57 24.84 10.60 NVSS
6 NVSS J185542+050430 18 55 42.00 +05 04 30.00 10.63 NVSS
[WBH2005] G37.935+1.368 18 55 41.90 +05 04 33.96 10.68 WBHGP20CM
TGSSADR J185443.8+045716 18 54 43.80 +04 57 16.92 10.70 GMRTAS150M
7 NVSS J185452+050239 18 54 52.20 +05 02 39.84 11.49 NVSS
8 NVSS J185442+050144 18 54 42.91 +05 01 45.12 12.75 NVSS
[WBH2005] G37.562+1.439 18 54 45.70 +04 46 36.84 12.80 WBHGP20CM
9 NVSS J185445+044633 18 54 45.79 +04 46 32.88 12.83 NVSS
[WBH2005] G37.812+1.584 18 54 41.90 +05 03 54.00 14.24 WBHGP20CM
10 NVSS J185441+050354 18 54 41.81 +05 03 54.00 14.27 NVSS
11 NVSS J185611+050511 18 56 11.21 +05 05 12.12 15.47 NVSS
12 NVSS J185608+050632 18 56 08.50 +05 06 33.12 15.97 NVSS

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