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 J1639.0-2727

Field

Detected Excesses
Swift-XRT image of the field for 4FGL J1639.0-2727 Swift-XRT detections in the field for 4FGL J1639.0-2727

Detected Excesses (SNR(Sosta) > 3.0)

# R.A. (J2000) Dec. (J2000) Pos. Error (") Rate (cts/s) Counts SNR (Detect) SNR (Sosta)
1 16 38 49.28 -27 35 29.39 5.44 (2.4 ± 0.5) x 10-2 32 5.445 5.340

X-Ray and Gamma Ray Catalogs

More Catalogs
Swift-XRT image with known X-ray and gamma ray sources for 4FGL J1639.0-2727 Swift-XRT image with known radio, optical and UV sources for 4FGL J1639.0-2727

Known X-Ray and Gamma Ray Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Observatory/Database Table
1 1RXS J163850.1-273510 16 38 50.11 -27 35 09.96 7.96 ROSAT
2RXS J163850.0-273509 16 38 50.06 -27 35 09.96 7.96 ROSAT
1RXS J163850.1-273510 16 38 50.11 -27 35 09.96 7.96 ROSAT

Known Radio, Optical and UV Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Database Table
1 NVSS J163909-272707 16 39 09.31 -27 27 07.92 1.33 NVSS
TGSSADR J163909.2-272703 16 39 09.31 -27 27 02.88 1.36 GMRTAS150M
2 NVSS J163914-273137 16 39 15.00 -27 31 36.84 4.44 NVSS
GLEAM J163842-272605 16 38 42.60 -27 26 04.92 5.14 GLEAMEGCAT
3 NVSS J163842-272600 16 38 42.10 -27 26 00.96 5.27 NVSS
TGSSADR J163842.0-272600 16 38 42.10 -27 25 59.88 5.27 GMRTAS150M
4 PGCC G352.64+12.69 16 39 28.20 -27 28 27.12 5.33 PLANCKGCC
5 NVSS J163834-273050 16 38 34.39 -27 30 50.04 7.27 NVSS
6 WDS J16388-2735 16 38 48.00 -27 34 59.88 8.01 WDS
7 NVSS J163916-273709 16 39 16.80 -27 37 09.12 9.70 NVSS
8 NSV 7875 16 38 54.41 -27 18 23.04 9.73 GCVSNSVARS
9 SAO 184527 16 39 31.61 -27 17 09.24 12.30 SAO
V955 Sco 16 39 31.56 -27 17 08.16 12.31 GCVS
Rns 42440 16 39 31.56 -27 17 08.16 12.31 CPSTARS
CD-2711054 16 39 31.58 -27 17 08.16 12.31 ACRS
PPM 265775 16 39 31.56 -27 17 08.16 12.31 PPM
HIP 81566 16 39 31.56 -27 17 08.16 12.31 HIPPARCOS
HD 150035 16 39 31.61 -27 17 08.16 12.31 HIC
10 CD-2711055 16 39 37.61 -27 39 26.64 13.73 ACRS
PPM 732809 16 39 37.68 -27 39 27.00 13.75 PPM

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