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 J1856.5+1735

Field

Detected Excesses

Swift-XRT image of the field for 4FGL J1856.5+1735 Swift-XRT detections in the field for 4FGL J1856.5+1735


No detected excesses found.

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 57 04.18 +17 36 21.88 6.65 (2.8 ± 1.2) x 10-3 11 2.418 2.336

X-Ray and Gamma Ray Catalogs

More Catalogs

Swift-XRT image with known X-ray and gamma ray sources for 4FGL J1856.5+1735 Swift-XRT image with known radio, optical and UV sources for 4FGL J1856.5+1735


No known X-ray or gamma ray sources found.

Known Radio, Optical and UV Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Database Table
1 SAO 104276 18 56 26.09 +17 39 14.04 3.67 SAO
PPM 135504 18 56 26.02 +17 39 14.76 3.69 PPM
BD+17 3785 18 56 25.99 +17 39 15.12 3.69 ACRS
2 WDS J18568+1733 18 56 48.00 +17 33 00.00 4.61 WDS
3 NVSS J185644+173037 18 56 44.59 +17 30 37.08 6.02 NVSS
4 NVSS J185710+173116 18 57 10.51 +17 31 17.04 10.04 NVSS
TGSSADR J185710.4+173115 18 57 10.51 +17 31 14.88 10.05 GMRTAS150M
5 NVSS J185719+173642 18 57 19.20 +17 36 42.84 10.97 NVSS
6 PPM 135508 18 56 48.19 +17 47 24.72 11.96 PPM
BD+17 3788 18 56 48.19 +17 47 24.72 11.96 ACRS
7 BD+17 3789 18 57 22.92 +17 40 27.12 12.64 ACRS
HIP 93060 18 57 22.97 +17 40 27.12 12.65 HIPPARCOS
HD 230207 18 57 22.97 +17 40 26.76 12.65 HIC
PPM 135528 18 57 22.97 +17 40 26.76 12.65 PPM
SAO 104287 18 57 23.06 +17 40 25.68 12.66 SAO
8 NVSS J185600+172406 18 56 00.79 +17 24 06.12 14.20 NVSS
TGSSADR J185600.6+172404 18 56 00.60 +17 24 03.96 14.24 GMRTAS150M
VLSSr J185600.4+172402 18 56 00.41 +17 24 02.16 14.30 VLSSR
TGSSADR J185722.4+174441 18 57 22.39 +17 44 40.92 14.58 GMRTAS150M
9 NVSS J185722+174443 18 57 22.61 +17 44 43.08 14.63 NVSS
10 WDS J18573+1724 18 57 18.00 +17 23 60.00 16.05 WDS

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