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.

1FGL J1639.5-5152

Field

Detected Excesses
Swift-XRT image of the field for 1FGL J1639.5-5152 Swift-XRT detections in the field for 1FGL J1639.5-5152

Detected Excesses (SNR(Sosta) > 3.0)

# R.A. (J2000) Dec. (J2000) Pos. Error (") Rate (cts/s) Counts SNR (Detect) SNR (Sosta)
1 16 39 47.32 -51 59 47.41 4.23 (1.09 ± 0.13) x 10-2 88 8.325 8.095
2 16 39 26.25 -51 49 32.96 4.48 (7.8 ± 1.2) x 10-3 66 6.447 6.449

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 16 39 07.94 -51 46 22.48 5.00 (1.9 ± 0.7) x 10-3 26 2.581 2.887
2 16 40 02.91 -51 48 15.36 5.49 (1.6 ± 0.6) x 10-3 20 2.603 2.630
3 16 39 20.69 -51 57 02.40 5.14 (1.7 ± 0.7) x 10-3 25 2.751 2.587
4 16 40 09.84 -51 45 33.31 5.05 (1.5 ± 0.6) x 10-3 21 2.555 2.451
5 16 39 14.10 -51 47 33.03 5.00 (1.6 ± 0.7) x 10-3 25 2.759 2.346
6 16 40 28.03 -51 49 07.85 5.40 (1.2 ± 0.5) x 10-3 13 2.423 2.208
7 16 38 37.91 -51 49 52.91 5.11 (10 ± 5) x 10-4 22 2.769 1.866

X-Ray and Gamma Ray Catalogs

More Catalogs
Swift-XRT image with known X-ray and gamma ray sources for 1FGL J1639.5-5152 Swift-XRT image with known radio, optical and UV sources for 1FGL J1639.5-5152

Known X-Ray and Gamma Ray Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Observatory/Database Table
1 2EG J1648-5042 16 39 00.00 -51 53 60.00 5.57 INTEGRAL
HD 149813 16 39 46.97 -51 59 39.12 7.26 ROSAT
1RXS J163946.7-515941 16 39 46.70 -51 59 40.92 7.28 ROSAT
1RXS J163946.7-515941 16 39 46.70 -51 59 41.64 7.29 ROSAT
2RXS J163946.6-515942 16 39 46.63 -51 59 42.00 7.29 ROSAT
2 XMMSL2 J163947.1-515946 16 39 46.99 -51 59 45.96 7.37 XMM-NEWTON

Known Radio, Optical and UV Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Database Table
1 PMN J1639-5150 16 39 10.90 -51 50 24.00 4.34 PMN
2 MGPS J163906-514857 16 39 06.89 -51 48 56.88 5.68 MGPS2
TGSSADR J163906.9-514853 16 39 07.01 -51 48 54.00 5.71 GMRTAS150M
3 MGPS J163921-515833 16 39 21.70 -51 58 33.96 6.27 MGPS2
4 TGSSADR J163923.8-514634 16 39 23.81 -51 46 33.96 6.30 GMRTAS150M
5 MGPS J164020-514153 16 40 20.90 -51 41 53.16 12.88 MGPS2

Penn State University Goddard Space Flight Center Swift