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 J1644.4+2632

Field

Detected Excesses
Swift-XRT image of the field for 3FGL J1644.4+2632 Swift-XRT detections in the field for 3FGL J1644.4+2632

Detected Excesses (SNR(Sosta) > 3.0)

# R.A. (J2000) Dec. (J2000) Pos. Error (") Rate (cts/s) Counts SNR (Detect) SNR (Sosta)
1 16 44 42.43 +26 19 13.87 3.53 (6.40 ± 0.12) x 10-2 3113 56.140 52.410
2 16 45 03.38 +26 25 00.42 3.71 (4.6 ± 0.4) x 10-3 279 13.480 13.260
3 16 43 57.66 +26 17 45.11 3.69 (3.8 ± 0.3) x 10-3 253 12.600 11.760
4 16 44 45.94 +26 25 58.51 3.80 (2.0 ± 0.3) x 10-3 167 8.317 8.146
5 16 45 11.44 +26 20 24.30 3.79 (1.9 ± 0.2) x 10-3 130 8.486 8.110
6 16 44 35.41 +26 19 56.36 3.74 (1.2 ± 0.2) x 10-3 116 6.282 5.552
7 16 44 21.60 +26 20 41.62 3.79 (1.1 ± 0.2) x 10-3 99 5.094 5.204
8 16 44 13.71 +26 13 40.79 3.85 (10 ± 2) x 10-4 83 5.339 5.179
9 16 44 24.50 +26 21 24.11 3.80 (9 ± 2) x 10-4 77 4.353 4.465
10 16 44 55.61 +26 26 03.12 3.82 (8 ± 2) x 10-4 119 4.719 4.368
11 16 44 54.62 +26 20 42.59 3.85 (7 ± 2) x 10-4 83 4.238 4.155
12 16 44 37.00 +26 28 43.41 3.89 (7 ± 2) x 10-4 125 4.268 4.133
13 16 43 54.58 +26 19 19.21 3.75 (7 ± 2) x 10-4 90 4.497 4.082
14 16 44 14.19 +26 25 48.30 3.86 (7 ± 2) x 10-4 104 4.335 3.810
15 16 45 09.85 +26 14 46.45 3.95 (4.3 ± 1.3) x 10-4 48 3.229 3.247

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 44 39.43 +26 23 37.17 3.91 (4 ± 2) x 10-4 77 3.035 2.946
2 16 43 54.13 +26 18 57.72 3.75 (5 ± 2) x 10-4 87 3.682 2.932
3 16 43 45.82 +26 20 33.09 3.99 (4.1 ± 1.4) x 10-4 41 3.179 2.901
4 16 44 55.85 +26 26 06.44 3.82 (4 ± 2) x 10-4 129 2.998 2.703
5 16 44 35.41 +26 19 56.36 3.74 (4 ± 2) x 10-4 116 3.190 2.284
6 16 44 42.43 +26 19 13.87 3.53 N/A 3128 4.083 N/A
7 16 44 42.43 +26 19 13.87 3.53 N/A 3128 5.186 N/A
8 16 44 42.43 +26 19 13.87 3.53 N/A 3092 3.074 N/A

X-Ray and Gamma Ray Catalogs

More Catalogs
Swift-XRT image with known X-ray and gamma ray sources for 3FGL J1644.4+2632 Swift-XRT image with known radio, optical and UV sources for 3FGL J1644.4+2632

Known X-Ray and Gamma Ray Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Observatory/Database Table
1 4XMM J164419.8+263000 16 44 19.87 +26 30 00.36 3.33 XMM-NEWTON
2 4XMM J164436.7+262834 16 44 36.74 +26 28 34.68 4.27 XMM-NEWTON
3 4XMM J164408.1+263019 16 44 08.16 +26 30 19.08 5.28 XMM-NEWTON
4 4XMM J164439.8+262636 16 44 39.82 +26 26 36.60 6.36 XMM-NEWTON
5 4XMM J164446.2+262551 16 44 46.25 +26 25 51.60 7.65 XMM-NEWTON
6 4XMM J164440.7+262515 16 44 40.75 +26 25 15.60 7.70 XMM-NEWTON
7 4XMM J164413.5+262537 16 44 13.56 +26 25 37.20 7.79 XMM-NEWTON
8 4XMM J164438.1+262424 16 44 38.11 +26 24 24.84 8.35 XMM-NEWTON
9 4XMM J164456.7+262629 16 44 56.76 +26 26 29.04 8.59 XMM-NEWTON
10 4XMM J164455.8+262557 16 44 55.82 +26 25 57.36 8.83 XMM-NEWTON
11 4XMM J164359.6+262633 16 43 59.69 +26 26 33.00 8.97 XMM-NEWTON
12 4XMM J164439.3+262328 16 44 39.38 +26 23 27.96 9.33 XMM-NEWTON
13 4XMM J164420.8+262303 16 44 20.90 +26 23 03.84 9.67 XMM-NEWTON
14 4XMM J164423.3+262252 16 44 23.35 +26 22 53.04 9.76 XMM-NEWTON
15 4XMM J164450.9+262356 16 44 50.95 +26 23 56.04 9.85 XMM-NEWTON
16 4XMM J164354.7+262539 16 43 54.72 +26 25 40.08 10.39 XMM-NEWTON
17 4XMM J164503.5+262500 16 45 03.58 +26 25 00.84 10.71 XMM-NEWTON
18 4XMM J164424.3+262124 16 44 24.38 +26 21 24.84 11.19 XMM-NEWTON
19 4XMM J164422.0+262039 16 44 22.03 +26 20 39.48 12.00 XMM-NEWTON
20 4XMM J164413.1+262101 16 44 13.15 +26 21 01.80 12.08 XMM-NEWTON
21 4XMM J164348.8+262334 16 43 48.89 +26 23 34.08 12.78 XMM-NEWTON
22 4XMM J164454.9+262035 16 44 54.96 +26 20 35.52 13.23 XMM-NEWTON
23 4XMM J164509.6+262218 16 45 09.70 +26 22 18.12 13.62 XMM-NEWTON
24 4XMM J164352.8+262140 16 43 52.80 +26 21 40.68 13.62 XMM-NEWTON
25 4XMM J164522.6+262121 16 45 22.66 +26 21 21.24 16.32 XMM-NEWTON

Known Radio, Optical and UV Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Database Table
1 FIRST J164428.4+263512 16 44 28.51 +26 35 12.84 2.68 FIRST
2 FIRST J164415.7+262935 16 44 15.70 +26 29 35.88 4.27 FIRST
3 FIRST J164411.7+263005 16 44 11.71 +26 30 05.04 4.68 FIRST
4 Unknown 16 44 30.00 +26 38 60.00 6.46 RC3
5 16425+2645 16 44 32.02 +26 39 31.68 7.01 ZCAT
FIRST J164414.2+263846 16 44 14.30 +26 38 45.96 7.11 FIRST
TGSSADR J164414.5+263854 16 44 14.59 +26 38 53.88 7.19 GMRTAS150M
6 NVSS J164414+263855 16 44 14.59 +26 38 54.96 7.20 NVSS
FIRST J164414.6+263857 16 44 14.71 +26 38 57.84 7.24 FIRST
7 NVSS J164426+262508 16 44 26.81 +26 25 09.12 7.42 NVSS
QORG J164426.8+262506 16 44 26.81 +26 25 05.88 7.46 QORGCAT
FIRST J164426.8+262505 16 44 26.81 +26 25 05.88 7.47 FIRST
FIRST J164424.4+264006 16 44 24.50 +26 40 05.88 7.65 FIRST
TGSSADR J164425.2+264010 16 44 25.30 +26 40 09.84 7.69 GMRTAS150M
FIRST J164425.9+264011 16 44 25.90 +26 40 12.00 7.70 FIRST
8 NVSS J164425+264012 16 44 25.30 +26 40 12.00 7.73 NVSS
FIRST J164425.0+264012 16 44 25.01 +26 40 12.00 7.73 FIRST
9 FIRST J164443.1+262525 16 44 43.10 +26 25 26.04 7.73 FIRST
QORG J164443.0+262524 16 44 43.01 +26 25 23.88 7.75 QORGCAT
10 FIRST J164429.2+264019 16 44 29.21 +26 40 19.92 7.79 FIRST
11 FIRST J164417.9+264015 16 44 17.90 +26 40 15.96 8.15 FIRST
TGSSADR J164437.0+264045 16 44 37.01 +26 40 45.12 8.39 GMRTAS150M
12 NVSS J164436+264048 16 44 37.01 +26 40 48.00 8.43 NVSS
FIRST J164437.3+264048 16 44 37.30 +26 40 48.00 8.45 FIRST
13 PGC 58887 16 44 31.99 +26 40 58.08 8.45 PGC2003
UZC J164432.1+264058 16 44 32.11 +26 40 58.08 8.45 UZC
GLEAM J164349+263122 16 43 49.61 +26 31 22.08 9.01 GLEAMEGCAT
B2.2 1641+26 16 43 49.51 +26 31 23.16 9.04 DIXON
TXS 1641+266 16 43 49.39 +26 31 19.92 9.06 TEXAS
FIRST J164349.4+263119 16 43 49.39 +26 31 18.84 9.06 FIRST
VLSSr J164349.3+263119 16 43 49.39 +26 31 19.92 9.07 VLSSR
TGSSADR J164349.3+263119 16 43 49.39 +26 31 18.84 9.07 GMRTAS150M
14 NVSS J164349+263119 16 43 49.30 +26 31 18.84 9.07 NVSS
15 FIRST J164409.5+262428 16 44 09.50 +26 24 29.16 9.22 FIRST
16 FIRST J164506.1+263646 16 45 06.19 +26 36 47.16 9.23 FIRST
17 BD+26 2891 16 43 56.11 +26 38 03.84 9.29 ACRS
18 GB6 J1643+2633 16 43 47.30 +26 33 21.96 9.48 GB6
19 BD+26 2890 16 43 52.37 +26 37 10.20 9.51 ACRS
WDS J16439+2638 16 43 54.00 +26 37 59.88 9.64 WDS
FIRST J164347.2+263445 16 43 47.30 +26 34 45.84 9.71 FIRST
20 NVSS J164347+263445 16 43 47.21 +26 34 45.12 9.73 NVSS
21 SDSS J16439+2625 16 43 54.70 +26 25 39.00 10.40 VERONCAT
22 NVSS J164342+263241 16 43 42.60 +26 32 40.92 10.49 NVSS
FIRST J164342.0+263239 16 43 42.00 +26 32 39.84 10.63 FIRST
QORG J164342.0+263239 16 43 42.00 +26 32 39.12 10.63 QORGCAT
23 SDSS J16450+2625 16 45 03.31 +26 25 00.12 10.67 VERONCAT
PGC 1782134 16 43 41.40 +26 36 06.84 11.34 PGC2003
24 NVSS J164340+263544 16 43 40.30 +26 35 44.16 11.47 NVSS
QORG J164340.1+263547 16 43 40.10 +26 35 47.04 11.52 QORGCAT
25 NVSS J164354+264117 16 43 54.10 +26 41 17.16 11.80 NVSS
26 FIRST J164420.1+262052 16 44 20.11 +26 20 53.16 11.85 FIRST
FIRST J164354.0+264132 16 43 54.10 +26 41 31.92 11.99 FIRST
27 FIRST J164345.7+264008 16 43 45.70 +26 40 09.12 12.41 FIRST
28 NVSS J164452+262053 16 44 52.20 +26 20 53.88 12.70 NVSS
FIRST J164346.4+264115 16 43 46.39 +26 41 16.08 13.00 FIRST
TGSSADR J164346.4+264117 16 43 46.49 +26 41 17.16 13.01 GMRTAS150M
29 NVSS J164346+264117 16 43 46.30 +26 41 17.88 13.04 NVSS
TGSSADR J164504.1+264342 16 45 04.10 +26 43 41.88 13.58 GMRTAS150M
FIRST J164504.2+264342 16 45 04.20 +26 43 41.88 13.59 FIRST
30 NVSS J164504+264342 16 45 04.39 +26 43 42.96 13.63 NVSS
31 SDSS J16452+2643 16 45 15.79 +26 43 59.16 15.42 VERONCAT

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