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 J1840.4-1139

Field

Detected Excesses

Swift-XRT image of the field for 4FGL J1840.4-1139 Swift-XRT detections in the field for 4FGL J1840.4-1139


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 40 38.77 -11 48 38.92 5.44 (6 ± 3) x 10-3 20 2.895 2.514

X-Ray and Gamma Ray Catalogs

More Catalogs

Swift-XRT image with known X-ray and gamma ray sources for 4FGL J1840.4-1139 Swift-XRT image with known radio, optical and UV sources for 4FGL J1840.4-1139


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 NVSS J184018-113135 18 40 18.00 -11 31 36.12 7.69 NVSS
TGSSADR J184018.1-113135 18 40 18.19 -11 31 35.04 7.69 GMRTAS150M
2 NVSS J184046-113037 18 40 46.70 -11 30 38.16 9.90 NVSS
3 NVSS J184031-114855 18 40 31.90 -11 48 55.08 9.98 NVSS
4 NVSS J184021-112836 18 40 21.79 -11 28 36.12 10.50 NVSS
5 NVSS J183942-114242 18 39 42.91 -11 42 42.12 11.07 NVSS
TGSSADR J183942.8-114242 18 39 42.91 -11 42 42.84 11.07 GMRTAS150M
6 NVSS J184112-114216 18 41 12.19 -11 42 15.84 11.87 NVSS
7 NVSS J183939-113448 18 39 39.10 -11 34 49.08 12.14 NVSS
TGSSADR J183938.9-113454 18 39 39.00 -11 34 54.12 12.15 GMRTAS150M
8 NVSS J184107-114607 18 41 07.90 -11 46 06.96 12.54 NVSS
TGSSADR J184107.8-114607 18 41 07.90 -11 46 08.04 12.55 GMRTAS150M
TGSSADR J184100.8-112746 18 41 00.79 -11 27 47.16 14.21 GMRTAS150M
9 NVSS J184100-112746 18 41 00.91 -11 27 47.16 14.21 NVSS

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