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.

3FGL J2139.5+3919

Field

Detected Excesses

Swift-XRT image of the field for 3FGL J2139.5+3919 Swift-XRT detections in the field for 3FGL J2139.5+3919


No detected excesses found.

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 38 49.07 +39 28 38.23 7.71 (3.3 ± 1.3) x 10-3 9 2.316 2.614
2 21 39 37.62 +39 23 02.16 7.71 (3.6 ± 1.4) x 10-3 10 2.431 2.528

X-Ray and Gamma Ray Catalogs

More Catalogs

Swift-XRT image with known X-ray and gamma ray sources for 3FGL J2139.5+3919 Swift-XRT image with known radio, optical and UV sources for 3FGL J2139.5+3919

Known X-Ray and Gamma Ray Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Observatory/Database Table
1 1RXS J214013.7+390953 21 40 13.70 +39 09 53.64 12.09 ROSAT

Known Radio, Optical and UV Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Database Table
1 NVSS J213937+391624 21 39 37.20 +39 16 24.96 3.03 NVSS
WN 2137.5+3902 21 39 38.11 +39 16 14.88 3.22 WENSS
WN 2137.7+3902 21 39 49.51 +39 15 55.08 4.46 WENSS
2 NVSS J213949+391551 21 39 49.51 +39 15 51.84 4.50 NVSS
TGSSADR J213949.5+391550 21 39 49.51 +39 15 50.04 4.52 GMRTAS150M
3 NVSS J214004+391609 21 40 04.70 +39 16 09.12 6.55 NVSS
TGSSADR J214004.7+391608 21 40 04.70 +39 16 08.04 6.57 GMRTAS150M
VLSSr J214004.4+391559 21 40 04.51 +39 15 59.04 6.60 VLSSR
WN 2138.0+3902 21 40 04.99 +39 16 06.96 6.63 WENSS
4 NVSS J213943+391221 21 39 43.39 +39 12 20.88 7.25 NVSS
5 NVSS J213856+392016 21 38 56.21 +39 20 17.16 7.62 NVSS
6 NVSS J213859+392235 21 38 58.99 +39 22 36.12 7.70 NVSS
7 NVSS J213903+391415 21 39 03.41 +39 14 15.00 8.05 NVSS
TGSSADR J213841.5+391817 21 38 41.50 +39 18 16.92 10.47 GMRTAS150M
8 NVSS J213841+391819 21 38 41.30 +39 18 19.08 10.51 NVSS
WN 2136.6+3904 21 38 41.11 +39 18 15.12 10.54 WENSS
VLSSr J213840.9+391832 21 38 40.99 +39 18 32.04 10.55 VLSSR
9 NVSS J214026+391432 21 40 26.21 +39 14 31.92 10.99 NVSS
10 NVSS J214016+391146 21 40 16.90 +39 11 45.96 11.11 NVSS
TXS 2138+389 21 40 16.99 +39 11 45.96 11.13 TEXAS
CRATES J214017+391145 21 40 16.99 +39 11 44.88 11.13 CRATES
WN 2138.2+3858 21 40 16.99 +39 11 44.16 11.15 WENSS
TGSSADR J214017.0+391143 21 40 16.99 +39 11 44.16 11.15 GMRTAS150M
GB6 J2140+3911 21 40 17.50 +39 11 44.88 11.21 GB6
B2.3 2138+38 21 40 17.21 +39 11 39.12 11.24 DIXON
2138+3858 21 40 17.71 +39 11 40.92 11.29 NORTH6CM
2138+3858 21 40 17.71 +39 11 40.92 11.29 NORTH20CM
11 MITG J2140+3911 21 40 20.59 +39 11 36.96 11.74 MITGB6CM
12 NVSS J213836+392433 21 38 36.79 +39 24 33.84 12.42 NVSS
13 NVSS J213847+392803 21 38 47.50 +39 28 03.00 12.63 NVSS
14 NVSS J213847+391037 21 38 47.40 +39 10 36.84 12.80 NVSS
15 NVSS J214032+390959 21 40 33.00 +39 10 00.12 14.62 NVSS

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