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 J1821.9+6636

Field

Detected Excesses

Swift-XRT image of the field for 3FGL J1821.9+6636 Swift-XRT detections in the field for 3FGL J1821.9+6636

Detected Excesses (SNR(Sosta) > 3.0)

# R.A. (J2000) Dec. (J2000) Pos. Error (") Rate (cts/s) Counts SNR (Detect) SNR (Sosta)
1 18 19 57.28 +66 36 12.54 4.54 (9 ± 2) x 10-3 50 5.626 5.442

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 18 21 09.61 +66 35 43.01 4.88 (3.3 ± 1.2) x 10-3 33 3.188 2.824
2 18 20 18.75 +66 38 54.10 4.92 (2.3 ± 0.9) x 10-3 21 2.933 2.530
3 18 20 05.08 +66 38 06.97 4.92 (2.3 ± 1.0) x 10-3 24 2.513 2.346
4 18 20 28.71 +66 42 31.25 5.11 (2.1 ± 0.9) x 10-3 17 2.556 2.329

X-Ray and Gamma Ray Catalogs

More Catalogs

Swift-XRT image with known X-ray and gamma ray sources for 3FGL J1821.9+6636 Swift-XRT image with known radio, optical and UV sources for 3FGL J1821.9+6636

Known X-Ray and Gamma Ray Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Observatory/Database Table
1 2RXS J182226.5+663848 18 22 26.57 +66 38 48.84 4.22 ROSAT
2RXS J182226.5+663848 18 22 26.57 +66 38 48.84 4.22 ROSAT
2 RX J1822.6+6641 18 22 37.39 +66 41 29.04 6.91 ROSAT
1RXS J182237.4+664129 18 22 37.39 +66 41 29.40 6.92 ROSAT
2RXS J182237.8+664132 18 22 37.80 +66 41 32.64 6.98 ROSAT
2RXS J182237.8+664132 18 22 37.80 +66 41 32.64 6.98 ROSAT
3 2RXS J182013.8+663615 18 20 13.87 +66 36 15.12 9.99 ROSAT
2RXS J182013.8+663615 18 20 13.87 +66 36 15.12 9.99 ROSAT
4 1RXS J182120.5+664631 18 21 20.50 +66 46 31.08 11.01 ROSAT
5 1RXS J181955.5+663619 18 19 55.51 +66 36 19.44 11.82 ROSAT
RX J1819.9+6636 18 19 55.39 +66 36 19.08 11.83 ROSAT
2RXS J181955.3+663620 18 19 55.34 +66 36 20.16 11.83 ROSAT
2RXS J181955.3+663620 18 19 55.34 +66 36 20.16 11.83 ROSAT
6 1RXS J181959.9+662825 18 19 59.90 +66 28 25.68 13.71 ROSAT
RX J1819.9+6628 18 19 59.90 +66 28 24.96 13.72 ROSAT
2RXS J181959.6+662825 18 19 59.64 +66 28 24.96 13.74 ROSAT
2RXS J181959.6+662825 18 19 59.64 +66 28 24.96 13.74 ROSAT
RX J1819.9+6628 18 19 58.99 +66 28 30.00 13.75 ROSAT
7 2RXS J182352.9+664614 18 23 52.94 +66 46 14.16 15.54 ROSAT
2RXS J182352.9+664614 18 23 52.94 +66 46 14.16 15.54 ROSAT

Known Radio, Optical and UV Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Database Table
VLA-NEP J1822.0+6635 18 21 59.40 +66 35 52.08 0.51 VLANEP
1 NVSS J182200+663553 18 22 00.41 +66 35 53.16 0.60 NVSS
2 NVSS J182203+663712 18 22 03.50 +66 37 13.08 1.48 NVSS
WN 1822.0+6635 18 22 04.20 +66 37 10.92 1.49 WENSS
VLA-NEP J1822.1+6637 18 22 03.50 +66 37 14.88 1.50 VLANEP
PCCS2 857 G096.56+27.62 18 22 06.19 +66 37 21.00 1.75 PCCS857GHZ
3 PCCS2 545 G096.57+27.61 18 22 10.51 +66 37 45.84 2.35 PCCS545GHZ
VLA-NEP J1822.3+6635 18 22 20.40 +66 35 12.12 2.70 VLANEP
4 NVSS J182220+663509 18 22 20.50 +66 35 08.88 2.72 NVSS
5 NVSS J182111+663611 18 21 11.71 +66 36 11.88 4.25 NVSS
6 NVSS J182233+663939 18 22 33.00 +66 39 39.96 5.26 NVSS
7 NVSS J182226+663151 18 22 26.81 +66 31 50.88 5.27 NVSS
8 NVSS J182119+663158 18 21 19.39 +66 31 58.08 5.36 NVSS
VLA-NEP J1821.3+6631 18 21 19.20 +66 31 59.16 5.36 VLANEP
WN 1821.3+6630 18 21 20.21 +66 31 51.96 5.38 WENSS
TGSSADR J182118.8+663156 18 21 18.79 +66 31 57.00 5.42 GMRTAS150M
9 VLA-NEP J1822.8+6634 18 22 50.21 +66 34 31.08 5.74 VLANEP
10 VLA-NEP J1822.8+6638 18 22 49.80 +66 38 34.08 6.04 VLANEP
11 VLA-NEP J1822.0+6643 18 21 58.99 +66 43 54.84 7.89 VLANEP
12 PCCS2 857 G096.36+27.67 18 21 26.50 +66 27 12.96 9.25 PCCS857GHZ
13 VLA-NEP J1823.2+6643 18 23 10.51 +66 43 12.00 10.39 VLANEP
14 VLA-NEP J1820.7+6643 18 20 42.70 +66 43 41.88 10.46 VLANEP
15 NVSS J182336+663309 18 23 36.31 +66 33 09.00 10.52 NVSS
VLA-NEP J1823.6+6633 18 23 37.39 +66 33 06.12 10.64 VLANEP
16 NVSS J182025+663002 18 20 25.01 +66 30 02.16 10.74 NVSS
VLA-NEP J1820.4+6629 18 20 25.70 +66 29 54.96 10.75 VLANEP
WN 1819.9+6634 18 19 58.39 +66 36 15.12 11.53 WENSS
17 VLA-NEP J1820.0+6633 18 20 00.70 +66 33 47.16 11.53 VLANEP
18 NVSS J181957+663613 18 19 57.60 +66 36 14.04 11.61 NVSS
VLA-NEP J1820.0+6636 18 19 57.19 +66 36 15.12 11.65 VLANEP
19 VLA-NEP J1823.8+6632 18 23 48.50 +66 32 39.84 11.82 VLANEP
20 VLA-NEP J1820.6+6645 18 20 34.20 +66 45 07.92 12.08 VLANEP
VLA-NEP J1820.1+6628 18 20 03.79 +66 28 14.88 13.49 VLANEP
WN 1819.9+6627 18 19 59.40 +66 28 36.84 13.64 WENSS
21 NVSS J181959+662830 18 19 59.71 +66 28 31.08 13.69 NVSS
VLA-NEP J1820.0+6628 18 19 57.41 +66 28 44.04 13.76 VLANEP
VLA-NEP J1820.7+6624 18 20 42.91 +66 24 03.96 13.94 VLANEP
22 NVSS J182042+662403 18 20 42.70 +66 24 02.88 13.96 NVSS
23 VLA-NEP J1820.5+6624 18 20 28.70 +66 24 38.88 14.24 VLANEP

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