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 J1641.5+2017

Field

Detected Excesses
Swift-XRT image of the field for 4FGL J1641.5+2017 Swift-XRT detections in the field for 4FGL J1641.5+2017

Detected Excesses (SNR(Sosta) > 3.0)

# R.A. (J2000) Dec. (J2000) Pos. Error (") Rate (cts/s) Counts SNR (Detect) SNR (Sosta)
1 16 41 15.54 +20 17 12.43 5.76 (4.5 ± 1.2) x 10-3 23 3.990 3.867

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 41 48.37 +20 13 42.03 6.12 (2.1 ± 0.8) x 10-3 16 2.963 2.583
2 16 41 10.17 +20 15 23.30 7.48 (1.5 ± 0.7) x 10-3 9 2.467 2.158

X-Ray and Gamma Ray Catalogs

More Catalogs
Swift-XRT image with known X-ray and gamma ray sources for 4FGL J1641.5+2017 Swift-XRT image with known radio, optical and UV sources for 4FGL J1641.5+2017

Known X-Ray and Gamma Ray Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Observatory/Database Table
1 2RXS J164133.7+201233 16 41 33.79 +20 12 33.84 5.12 ROSAT
2RXS J164133.7+201233 16 41 33.79 +20 12 33.84 5.12 ROSAT
2 2RXS J164209.5+200729 16 42 09.53 +20 07 29.64 13.59 ROSAT
2RXS J164209.5+200729 16 42 09.53 +20 07 29.64 13.59 ROSAT

Known Radio, Optical and UV Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Database Table
1 FIRST J164133.7+201415 16 41 33.79 +20 14 16.08 3.44 FIRST
2 FIRST J164115.4+201710 16 41 15.41 +20 17 09.96 3.67 FIRST
FIRST J164144.5+202111 16 41 44.50 +20 21 11.16 4.76 FIRST
3 NVSS J164145+202118 16 41 45.29 +20 21 19.08 4.97 NVSS
FIRST J164158.8+201742 16 41 58.90 +20 17 42.00 6.55 FIRST
TGSSADR J164158.9+201743 16 41 58.99 +20 17 43.08 6.57 GMRTAS150M
4 NVSS J164159+201741 16 41 59.11 +20 17 40.92 6.60 NVSS
5 445- 50 16 41 07.32 +20 22 05.52 7.11 NLTT
6 NVSS J164206+201723 16 42 06.60 +20 17 24.00 8.35 NVSS
FIRST J164207.0+201721 16 42 07.10 +20 17 21.12 8.47 FIRST
7 FIRST J164209.1+201925 16 42 09.19 +20 19 24.96 9.13 FIRST
8 PGC 1618623 16 41 57.50 +20 10 00.12 9.85 PGC2003
9 NVSS J164057+201113 16 40 57.50 +20 11 12.84 10.15 NVSS
FIRST J164057.4+201112 16 40 57.50 +20 11 12.12 10.16 FIRST
10 FIRST J164154.9+200907 16 41 55.01 +20 09 06.84 10.21 FIRST
11 FIRST J164057.7+200935 16 40 57.70 +20 09 36.00 11.21 FIRST
12 NVSS J164118+200548 16 41 18.60 +20 05 48.12 12.19 NVSS
TXS 1639+201 16 41 18.60 +20 05 48.12 12.19 TEXAS
FIRST J164118.5+200547 16 41 18.60 +20 05 48.12 12.20 FIRST
TGSSADR J164118.6+200547 16 41 18.60 +20 05 47.04 12.20 GMRTAS150M
GLEAM J164118+200541 16 41 18.70 +20 05 40.92 12.30 GLEAMEGCAT
13 NVSS J164207+200832 16 42 07.20 +20 08 33.00 12.45 NVSS
FIRST J164207.2+200832 16 42 07.30 +20 08 31.92 12.46 FIRST
TGSSADR J164207.3+200831 16 42 07.30 +20 08 30.84 12.48 GMRTAS150M
14 1639+2011L 16 41 13.61 +20 05 44.88 12.58 NORTH20CM
15 SDSS J16420+2005 16 42 06.00 +20 05 58.92 14.26 VERONCAT

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