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 J1855.8+0150

Field

Detected Excesses
Swift-XRT image of the field for 4FGL J1855.8+0150 Swift-XRT detections in the field for 4FGL J1855.8+0150

Detected Excesses (SNR(Sosta) > 3.0)

# R.A. (J2000) Dec. (J2000) Pos. Error (") Rate (cts/s) Counts SNR (Detect) SNR (Sosta)
1 18 55 50.28 +01 57 00.75 4.95 (2.9 ± 0.7) x 10-3 35 4.687 4.442
2 18 54 36.77 +01 53 14.31 6.12 (1.5 ± 0.5) x 10-3 14 2.938 3.005

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 39.39 +01 34 23.11 5.17 (9 ± 4) x 10-4 13 2.529 2.148
2 18 55 42.83 +01 52 35.53 5.35 (9 ± 5) x 10-4 22 2.497 1.932

X-Ray and Gamma Ray Catalogs

More Catalogs
Swift-XRT image with known X-ray and gamma ray sources for 4FGL J1855.8+0150 Swift-XRT image with known radio, optical and UV sources for 4FGL J1855.8+0150

Known X-Ray and Gamma Ray Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Observatory/Database Table
1 1WGA J1855.2+0149 18 55 15.31 +01 49 04.08 8.76 ROSAT
2 XMMSL2 J185526.0+015706 18 55 25.97 +01 57 06.12 8.83 XMM-NEWTON
3 X185543.41+013955.0 18 55 43.42 +01 39 55.08 10.79 CHANDRA
4 2CXO J185549.8+013945 18 55 49.90 +01 39 45.72 10.83 CHANDRA
X185549.89+013945.2 18 55 49.90 +01 39 45.36 10.84 CHANDRA
CXOGSG J185549.9+013943 18 55 49.94 +01 39 43.92 10.86 CHANDRA
5 CXOGSG J185521.2+014146 18 55 21.24 +01 41 46.68 11.35 CHANDRA
6 2CXO J185529.0+014013 18 55 29.02 +01 40 13.80 11.59 CHANDRA
7 2CXO J185534.5+013937 18 55 34.58 +01 39 37.08 11.62 CHANDRA
X185534.67+013936.4 18 55 34.68 +01 39 36.36 11.62 CHANDRA
8 X185520.58+014006.2 18 55 20.59 +01 40 06.24 12.78 CHANDRA
9 X185517.61+014017.7 18 55 17.62 +01 40 17.76 13.07 CHANDRA
CXOGSG J185517.3+014017 18 55 17.35 +01 40 17.04 13.12 CHANDRA
10 X185521.52+013924.0 18 55 21.53 +01 39 24.12 13.24 CHANDRA
11 2CXO J185516.4+013916 18 55 16.46 +01 39 16.56 14.06 CHANDRA
12 2CXO J185518.9+013844 18 55 18.96 +01 38 44.16 14.14 CHANDRA
CXOGSG J185518.9+013843 18 55 18.96 +01 38 44.16 14.14 CHANDRA
X185518.97+013843.9 18 55 18.96 +01 38 43.80 14.15 CHANDRA
X185514.96+013918.8 18 55 14.95 +01 39 18.72 14.25 CHANDRA
13 X185513.66+013909.6 18 55 13.66 +01 39 09.72 14.57 CHANDRA

Known Radio, Optical and UV Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Database Table
1 [WBH2005] G35.070-0.089 18 55 39.31 +01 51 43.92 2.87 WBHGP6CM
2 [WBH2005] G35.073-0.208 18 56 05.11 +01 48 39.96 4.27 WBHGP6CM
3 [WBH2005] G34.965-0.134 18 55 37.61 +01 44 53.88 6.46 WBHGP6CM
4 [WBH2005] G35.099-0.242 18 56 15.41 +01 49 05.16 6.56 WBHGP6CM
[WBH2005] G35.100-0.245 18 56 15.91 +01 49 04.08 6.70 WBHGP6CM
5 [WBH2005] G34.962-0.150 18 55 40.70 +01 44 17.16 6.71 WBHGP6CM
6 [WBH2005] G34.994-0.053 18 55 23.50 +01 48 39.96 6.85 WBHGP6CM
7 NVSS J185532+015840 18 55 32.71 +01 58 41.16 9.14 NVSS
8 NVSS J185514+015334 18 55 13.99 +01 53 35.16 9.43 NVSS
9 NVSS J185511+015012 18 55 11.81 +01 50 12.12 9.51 NVSS
10 NK1.45 18 55 19.90 +01 44 09.96 9.86 DIXON
11 NVSS J185529+014203 18 55 29.40 +01 42 02.88 9.94 NVSS
12 NVSS J185511+014725 18 55 11.11 +01 47 25.08 10.17 NVSS
13 NVSS J185622+015726 18 56 22.80 +01 57 25.92 10.71 NVSS
14 NVSS J185511+014519 18 55 11.81 +01 45 20.16 10.86 NVSS
15 [WBH2005] G35.082-0.326 18 56 31.39 +01 45 52.92 11.41 WBHGP6CM
16 NVSS J185619+015937 18 56 19.49 +01 59 38.04 11.70 NVSS
17 GB6 J1855+0146 18 55 03.10 +01 46 22.08 12.42 GB6
18 NVSS J185526+020200 18 55 26.40 +02 02 00.96 12.84 NVSS
19 NVSS J185503+014456 18 55 03.50 +01 44 56.04 12.88 NVSS
20 NVSS J185516+014034 18 55 16.10 +01 40 33.96 13.09 NVSS
[WBH2005] G34.894-0.011 18 55 03.50 +01 44 30.12 13.09 WBHGP6CM
21 NVSS J185512+014125 18 55 12.10 +01 41 26.16 13.15 NVSS
[WBH2005] G34.863-0.063 18 55 10.99 +01 41 22.92 13.38 WBHGP20CM
[WBH2005] G34.862-0.063 18 55 10.99 +01 41 21.12 13.40 WBHGP6CM
22 NVSS J185637+015716 18 56 37.30 +01 57 15.84 13.61 NVSS
23 NVSS J185617+020220 18 56 17.50 +02 02 21.12 13.64 NVSS
24 [WBH2005] G35.166+0.072 18 55 15.50 +02 01 15.96 13.68 WBHGP6CM
25 BD+01 3819 18 55 12.86 +01 39 40.32 14.30 ACRS
PPM 166800 18 55 12.86 +01 39 40.32 14.30 PPM
26 GB6 J1855+0142 18 55 02.81 +01 42 18.00 14.38 GB6
27 NVSS J185633+020014 18 56 33.19 +02 00 15.12 14.52 NVSS
28 QORG J185515.2+013854 18 55 15.19 +01 38 53.88 14.55 QORGCAT

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