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 J2109.6+3954

Field

Detected Excesses
Swift-XRT image of the field for 4FGL J2109.6+3954 Swift-XRT detections in the field for 4FGL J2109.6+3954

Detected Excesses (SNR(Sosta) > 3.0)

# R.A. (J2000) Dec. (J2000) Pos. Error (") Rate (cts/s) Counts SNR (Detect) SNR (Sosta)
1 21 09 36.25 +39 55 11.91 4.52 (1.2 ± 0.2) x 10-2 61 6.643 6.643

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 21 10 02.46 +40 00 11.22 6.04 (1.7 ± 0.7) x 10-3 15 2.356 2.445
2 21 09 26.58 +39 47 12.09 5.53 (1.6 ± 0.7) x 10-3 13 2.739 2.223
3 21 09 42.66 +40 03 04.55 6.52 (1.0 ± 0.6) x 10-3 12 2.485 1.804

X-Ray and Gamma Ray Catalogs

More Catalogs
Swift-XRT image with known X-ray and gamma ray sources for 4FGL J2109.6+3954 Swift-XRT image with known radio, optical and UV sources for 4FGL J2109.6+3954

Known X-Ray and Gamma Ray Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Observatory/Database Table
1 XMMSL2 J210936.3+395515 21 09 35.76 +39 55 01.56 0.81 XMM-NEWTON
XMMSL2 J210936.3+395515 21 09 37.25 +39 55 18.84 0.81 XMM-NEWTON
XMMSL2 J210936.3+395515 21 09 36.46 +39 55 14.88 0.84 XMM-NEWTON
2 1RXS J210953.9+395147 21 09 53.90 +39 51 47.16 3.98 ROSAT
3 2RXS J210955.4+394438 21 09 55.46 +39 44 38.40 10.45 ROSAT

Known Radio, Optical and UV Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Database Table
1 NVSS J210936+395515 21 09 36.19 +39 55 14.88 0.88 NVSS
2 NVSS J210922+395450 21 09 22.20 +39 54 50.04 3.29 NVSS
WN 2107.4+3940 21 09 19.99 +39 52 51.96 4.11 WENSS
TGSSADR J210919.8+395252 21 09 19.80 +39 52 53.04 4.13 GMRTAS150M
3 NVSS J210919+395252 21 09 19.80 +39 52 53.04 4.14 NVSS
WN 2108.0+3942 21 10 01.80 +39 54 41.04 4.31 WENSS
4 NVSS J211001+395502 21 10 01.99 +39 55 01.92 4.36 NVSS
5 NVSS J210938+394920 21 09 38.21 +39 49 19.92 5.29 NVSS
6 WDS J21098+4001 AB 21 09 48.00 +40 01 00.12 6.59 WDS
WDS J21098+4001 AC 21 09 48.00 +40 01 00.12 6.59 WDS
7 SAO 71004 21 10 02.11 +39 48 19.80 7.65 SAO
BD+39 4466 21 10 02.11 +39 48 19.44 7.66 ACRS
PPM 86136 21 10 02.14 +39 48 19.08 7.67 PPM
8 NVSS J211029+395746 21 10 29.21 +39 57 46.08 10.06 NVSS
PGC 2158437 21 10 29.40 +39 57 46.08 10.10 PGC2003
9 NVSS J210908+394616 21 09 08.69 +39 46 15.96 10.21 NVSS
WN 2107.2+3933 21 09 08.59 +39 45 56.16 10.51 WENSS
10 NVSS J210951+394400 21 09 51.19 +39 43 59.88 10.85 NVSS
11 WDS J21105+4000 21 10 30.00 +40 00 00.00 11.10 WDS
12 NVSS J210900+394433 21 09 00.00 +39 44 34.08 12.58 NVSS

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