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 J1821.6+6636

Field

Detected Excesses
Swift-XRT image of the field for 4FGL J1821.6+6636 Swift-XRT detections in the field for 4FGL J1821.6+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 57.76 +66 36 11.62 4.38 (7.9 ± 1.4) x 10-3 56 5.876 5.628
2 18 21 09.66 +66 35 43.35 4.76 (4.0 ± 1.1) x 10-3 42 3.712 3.586

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 22 03.74 +66 37 03.01 4.92 (2.8 ± 1.0) x 10-3 30 2.943 2.918
2 18 22 36.04 +66 41 14.94 5.35 (2.0 ± 0.8) x 10-3 16 2.524 2.531
3 18 20 03.14 +66 38 05.64 4.88 (2.3 ± 0.9) x 10-3 17 2.609 2.500

X-Ray and Gamma Ray Catalogs

More Catalogs
Swift-XRT image with known X-ray and gamma ray sources for 4FGL J1821.6+6636 Swift-XRT image with known radio, optical and UV sources for 4FGL J1821.6+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 5.20 ROSAT
2RXS J182226.5+663848 18 22 26.57 +66 38 48.84 5.20 ROSAT
2 RX J1822.6+6641 18 22 37.39 +66 41 29.04 7.57 ROSAT
1RXS J182237.4+664129 18 22 37.39 +66 41 29.40 7.58 ROSAT
2RXS J182237.8+664132 18 22 37.80 +66 41 32.64 7.64 ROSAT
2RXS J182237.8+664132 18 22 37.80 +66 41 32.64 7.64 ROSAT
3 2RXS J182013.8+663615 18 20 13.87 +66 36 15.12 8.49 ROSAT
2RXS J182013.8+663615 18 20 13.87 +66 36 15.12 8.49 ROSAT
4 1RXS J182120.5+664631 18 21 20.50 +66 46 31.08 10.13 ROSAT
5 1RXS J181955.5+663619 18 19 55.51 +66 36 19.44 10.31 ROSAT
RX J1819.9+6636 18 19 55.39 +66 36 19.08 10.32 ROSAT
2RXS J181955.3+663620 18 19 55.34 +66 36 20.16 10.33 ROSAT
2RXS J181955.3+663620 18 19 55.34 +66 36 20.16 10.33 ROSAT
6 1RXS J181959.9+662825 18 19 59.90 +66 28 25.68 12.81 ROSAT
RX J1819.9+6628 18 19 59.90 +66 28 24.96 12.82 ROSAT
RX J1819.9+6628 18 19 58.99 +66 28 30.00 12.83 ROSAT
2RXS J181959.6+662825 18 19 59.64 +66 28 24.96 12.84 ROSAT
2RXS J181959.6+662825 18 19 59.64 +66 28 24.96 12.84 ROSAT

Known Radio, Optical and UV Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Database Table
1 MCG+11-22-046 18 21 54.00 +66 36 36.00 1.45 MCG
2 N6636A 18 22 00.14 +66 36 36.00 2.06 ZCAT
VLA-NEP J1822.0+6635 18 21 59.40 +66 35 52.08 2.10 VLANEP
3 NVSS J182200+663553 18 22 00.41 +66 35 53.16 2.19 NVSS
SN 1989P 18 22 01.70 +66 36 12.24 2.25 ASIAGOSN
4 UGC 11221 18 21 59.93 +66 37 36.12 2.29 UGC
MCG+11-22-047 18 22 00.24 +66 35 34.80 2.29 MCG
N6636B 18 22 00.02 +66 37 36.12 2.30 ZCAT
UZC J182202.7+663659 18 22 02.71 +66 36 59.04 2.36 UZC
PGC 61782 18 22 02.90 +66 37 00.84 2.38 PGC2003
SN 1989P 18 22 03.50 +66 36 59.40 2.43 GCVSEGSN
NGC 6636 18 22 03.60 +66 36 59.04 2.44 RC3
5 NVSS J182203+663712 18 22 03.50 +66 37 13.08 2.48 NVSS
VLA-NEP J1822.1+6637 18 22 03.50 +66 37 14.88 2.49 VLANEP
NGC 6636 18 22 00.00 +66 37 59.88 2.50 NGC2000
6 PGC 2688704 18 21 21.41 +66 34 45.12 2.54 PGC2003
WN 1822.0+6635 18 22 04.20 +66 37 10.92 2.54 WENSS
PGC 61780 18 22 04.70 +66 37 22.08 2.64 PGC2003
7 1822+6635 18 22 06.14 +66 36 36.72 2.66 ZCAT
UGC 11221B 18 22 05.11 +66 37 18.84 2.66 VERONCAT
8 NVSS J182111+663611 18 21 11.71 +66 36 11.88 2.77 NVSS
PCCS2 857 G096.56+27.62 18 22 06.19 +66 37 21.00 2.78 PCCS857GHZ
9 PCCS2 545 G096.57+27.61 18 22 10.51 +66 37 45.84 3.32 PCCS545GHZ
VLA-NEP J1822.3+6635 18 22 20.40 +66 35 12.12 4.29 VLANEP
10 NVSS J182220+663509 18 22 20.50 +66 35 08.88 4.32 NVSS
VLA-NEP J1821.3+6631 18 21 19.20 +66 31 59.16 4.99 VLANEP
11 NVSS J182119+663158 18 21 19.39 +66 31 58.08 5.00 NVSS
TGSSADR J182118.8+663156 18 21 18.79 +66 31 57.00 5.05 GMRTAS150M
WN 1821.3+6630 18 21 20.21 +66 31 51.96 5.06 WENSS
12 PGC 2688569 18 22 25.99 +66 34 00.12 5.29 PGC2003
13 NVSS J182233+663939 18 22 33.00 +66 39 39.96 6.16 NVSS
14 NVSS J182226+663151 18 22 26.81 +66 31 50.88 6.66 NVSS
15 VLA-NEP J1822.8+6638 18 22 49.80 +66 38 34.08 7.27 VLANEP
16 RX J1822.6+6641 18 22 34.80 +66 41 21.12 7.29 ROSNEPOID
17 VLA-NEP J1822.8+6634 18 22 50.21 +66 34 31.08 7.33 VLANEP
18 VLA-NEP J1822.0+6643 18 21 58.99 +66 43 54.84 7.60 VLANEP
19 VLA-NEP J1820.7+6643 18 20 42.70 +66 43 41.88 9.09 VLANEP
20 PCCS2 857 G096.36+27.67 18 21 26.50 +66 27 12.96 9.43 PCCS857GHZ
21 NVSS J182025+663002 18 20 25.01 +66 30 02.16 9.86 NVSS
VLA-NEP J1820.4+6629 18 20 25.70 +66 29 54.96 9.89 VLANEP
WN 1819.9+6634 18 19 58.39 +66 36 15.12 10.03 WENSS
22 NVSS J181957+663613 18 19 57.60 +66 36 14.04 10.11 NVSS
VLA-NEP J1820.0+6636 18 19 57.19 +66 36 15.12 10.15 VLANEP
23 VLA-NEP J1820.0+6633 18 20 00.70 +66 33 47.16 10.19 VLANEP
RX J1819.9+6636 18 19 53.81 +66 36 19.08 10.48 ROSNEPOID
24 PGC 2687153 18 21 34.30 +66 25 51.96 10.70 PGC2003
25 VLA-NEP J1820.6+6645 18 20 34.20 +66 45 07.92 10.73 VLANEP
26 VLA-NEP J1823.2+6643 18 23 10.51 +66 43 12.00 11.20 VLANEP
27 VLA-NEP J1821.1+6648 18 21 07.70 +66 48 11.16 12.04 VLANEP
28 NVSS J182336+663309 18 23 36.31 +66 33 09.00 12.11 NVSS
VLA-NEP J1823.6+6633 18 23 37.39 +66 33 06.12 12.23 VLANEP
VLA-NEP J1820.1+6628 18 20 03.79 +66 28 14.88 12.63 VLANEP
WN 1819.9+6627 18 19 59.40 +66 28 36.84 12.72 WENSS
29 NVSS J181959+662830 18 19 59.71 +66 28 31.08 12.78 NVSS
VLA-NEP J1820.0+6628 18 19 57.41 +66 28 44.04 12.82 VLANEP
RX J1819.9+6628 18 19 58.99 +66 28 30.00 12.83 ROSNEPOID
RX J18199+6628 18 19 58.99 +66 28 28.92 12.84 VERONCAT
30 NVSS J182248+664821 18 22 48.79 +66 48 21.96 13.65 NVSS
31 PGC 2691118 18 20 13.20 +66 47 13.92 13.66 PGC2003
32 VLA-NEP J1820.5+6624 18 20 28.70 +66 24 38.88 13.83 VLANEP
33 PPM 20863 18 19 46.70 +66 47 07.44 15.36 PPM
HIP 89815 18 19 46.70 +66 47 07.44 15.36 HIPPARCOS
HD 169485 18 19 46.68 +66 47 07.44 15.36 HIC
SAO 17858 18 19 46.61 +66 47 07.08 15.36 SAO
BD+66 1100 18 19 46.63 +66 47 07.80 15.36 ACRS

Penn State University Goddard Space Flight Center Swift