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 J1818.8-0828

Field

Detected Excesses

Swift-XRT image of the field for 4FGL J1818.8-0828 Swift-XRT detections in the field for 4FGL J1818.8-0828

Detected Excesses (SNR(Sosta) > 3.0)

# R.A. (J2000) Dec. (J2000) Pos. Error (") Rate (cts/s) Counts SNR (Detect) SNR (Sosta)
1 18 19 37.07 -08 19 47.15 6.52 (6 ± 2) x 10-3 16 3.702 3.756

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 18 32.73 -08 37 09.04 6.93 (2.1 ± 1.0) x 10-3 11 2.177 2.113

X-Ray and Gamma Ray Catalogs

More Catalogs

Swift-XRT image with known X-ray and gamma ray sources for 4FGL J1818.8-0828 Swift-XRT image with known radio, optical and UV sources for 4FGL J1818.8-0828


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 J181827-082504 18 18 27.10 -08 25 05.16 7.05 NVSS
2 NVSS J181924-082757 18 19 24.31 -08 27 57.96 7.72 NVSS
3 690- 33 18 19 17.76 -08 34 59.88 9.28 NLTT
4 NVSS J181920-083628 18 19 19.99 -08 36 29.16 10.78 NVSS
QORG J181920.0-083629 18 19 19.99 -08 36 29.16 10.78 QORGCAT
5 NVSS J181816-082110 18 18 16.20 -08 21 10.08 11.40 NVSS
TGSSADR J181816.1-082109 18 18 16.20 -08 21 10.08 11.41 GMRTAS150M
6 NVSS J181854-083933 18 18 54.79 -08 39 33.84 11.56 NVSS
7 MM 28 18 18 13.61 -08 19 45.84 12.78 DIXON
8 SAO 142203 18 18 08.52 -08 38 00.96 14.88 SAO
BD-08 4583 18 18 08.50 -08 38 00.96 14.89 ACRS
HD 168014 18 18 08.50 -08 38 01.32 14.89 HIC
PPM 201590 18 18 08.50 -08 38 01.32 14.89 PPM
HIP 89686 18 18 08.47 -08 38 01.32 14.89 HIPPARCOS
9 NVSS J181937-081617 18 19 37.30 -08 16 17.04 16.04 NVSS

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