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.

2FGL J1639.7-5504

Field

Detected Excesses

Swift-XRT image of the field for 2FGL J1639.7-5504 Swift-XRT detections in the field for 2FGL J1639.7-5504

Detected Excesses (SNR(Sosta) > 3.0)

# R.A. (J2000) Dec. (J2000) Pos. Error (") Rate (cts/s) Counts SNR (Detect) SNR (Sosta)
1 16 39 11.47 -54 54 19.34 3.69 (1.41 ± 0.12) x 10-3 243 11.780 11.310
2 16 40 07.51 -55 05 37.95 3.61 (1.5 ± 0.2) x 10-3 557 11.100 10.010
3 16 40 39.17 -55 11 18.49 3.66 (9.8 ± 1.2) x 10-4 253 8.855 8.395
4 16 40 12.22 -54 53 32.61 3.78 (6.7 ± 0.9) x 10-4 156 7.992 7.588
5 16 40 06.17 -54 59 39.94 3.69 (7.9 ± 1.1) x 10-4 225 7.348 7.158
6 16 39 31.74 -55 05 57.28 3.65 (7.4 ± 1.1) x 10-4 386 7.108 6.669
7 16 38 40.79 -55 06 41.00 3.80 (5.2 ± 0.8) x 10-4 138 6.690 6.317
8 16 39 34.91 -54 57 48.48 3.74 (5.5 ± 0.9) x 10-4 163 5.888 6.001
9 16 40 22.80 -55 01 36.83 3.67 (5.7 ± 1.0) x 10-4 228 5.562 5.484
10 16 40 25.12 -55 00 41.79 3.67 (5.5 ± 1.0) x 10-4 237 5.732 5.388
11 16 40 00.73 -55 10 26.76 3.66 (5.7 ± 1.1) x 10-4 227 6.079 5.263
12 16 39 09.72 -55 07 23.22 3.69 (5.1 ± 1.0) x 10-4 250 5.517 5.158
13 16 39 52.61 -55 11 00.38 3.68 (5.6 ± 1.1) x 10-4 227 4.940 5.154
14 16 40 09.86 -54 55 10.35 3.75 (3.9 ± 0.8) x 10-4 156 4.879 5.066
15 16 40 48.13 -54 55 47.95 3.74 (4.0 ± 0.8) x 10-4 132 6.066 4.987
16 16 40 50.12 -54 58 29.86 3.74 (4.1 ± 0.8) x 10-4 114 5.291 4.884
17 16 40 25.13 -55 06 57.15 3.67 (4.8 ± 1.0) x 10-4 245 3.908 4.850
18 16 39 45.73 -54 55 14.88 3.75 (4.3 ± 0.9) x 10-4 147 5.004 4.799
19 16 40 17.80 -55 05 40.91 3.65 (4.9 ± 1.0) x 10-4 285 5.965 4.779
20 16 39 47.21 -54 51 55.10 3.99 (3.9 ± 0.9) x 10-4 63 4.333 4.498
21 16 38 58.42 -55 05 53.18 3.69 (4.0 ± 0.9) x 10-4 194 4.804 4.461
22 16 39 22.87 -55 08 39.99 3.67 (4.2 ± 0.9) x 10-4 258 5.194 4.406
23 16 39 27.08 -54 58 04.02 3.74 (3.6 ± 0.8) x 10-4 176 3.890 4.403
24 16 39 50.65 -55 00 46.28 3.72 (3.9 ± 0.9) x 10-4 238 4.574 4.399
25 16 38 52.76 -54 54 56.58 3.81 (2.9 ± 0.7) x 10-4 104 5.355 4.139
26 16 40 56.20 -54 59 25.24 3.74 (3.1 ± 0.8) x 10-4 128 5.058 4.132
27 16 39 03.52 -55 13 15.90 3.88 (2.7 ± 0.7) x 10-4 81 4.219 4.018
28 16 39 14.80 -55 05 33.50 3.68 (3.4 ± 0.9) x 10-4 266 3.954 3.883
29 16 39 39.91 -55 03 41.88 3.67 (3.6 ± 1.0) x 10-4 359 3.443 3.741
30 16 39 07.14 -55 02 15.09 3.69 (3.2 ± 1.0) x 10-4 205 3.728 3.336
31 16 40 36.12 -54 56 02.87 3.76 (2.0 ± 0.7) x 10-4 120 3.614 3.104
32 16 40 56.26 -55 03 19.70 3.73 (2.4 ± 0.8) x 10-4 130 3.622 3.030

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 40 39.07 -55 11 17.32 3.66 (4.6 ± 1.0) x 10-4 258 5.973 4.713
2 16 40 07.51 -55 05 37.95 3.61 (4.4 ± 1.0) x 10-4 557 5.814 4.197
3 16 39 31.82 -55 05 58.93 3.65 (3.8 ± 0.9) x 10-4 368 3.693 4.040
4 16 39 52.98 -55 10 59.67 3.68 (2.7 ± 0.8) x 10-4 243 3.782 3.334
5 16 39 09.82 -54 52 57.35 3.78 (1.8 ± 0.6) x 10-4 91 3.839 2.944
6 16 40 56.98 -55 01 18.63 3.76 (1.8 ± 0.6) x 10-4 125 3.067 2.933
7 16 39 00.20 -55 08 29.45 3.71 (2.5 ± 0.8) x 10-4 156 3.078 2.918
8 16 40 41.51 -55 07 43.29 3.68 (2.4 ± 0.9) x 10-4 205 3.108 2.832
9 16 40 37.86 -54 54 53.55 3.77 (1.9 ± 0.7) x 10-4 86 3.134 2.737
10 16 40 46.53 -55 04 56.11 3.67 (2.3 ± 0.9) x 10-4 205 3.287 2.693
11 16 40 34.98 -55 10 57.42 3.66 (2.2 ± 0.9) x 10-4 204 3.925 2.575
12 16 40 48.03 -55 04 52.88 3.68 (2.1 ± 0.8) x 10-4 190 4.380 2.559
13 16 40 42.31 -55 07 25.51 3.68 (2.0 ± 0.8) x 10-4 198 3.101 2.475
14 16 40 56.70 -54 56 03.16 3.80 (1.6 ± 0.6) x 10-4 107 3.559 2.466
15 16 40 48.04 -55 01 16.45 3.70 (1.8 ± 0.7) x 10-4 150 3.102 2.438
16 16 39 02.10 -55 01 33.14 3.69 (1.7 ± 0.8) x 10-4 207 3.212 2.191
17 16 40 07.51 -55 05 37.96 3.61 (2.2 ± 1.0) x 10-4 555 3.887 2.159
18 16 40 40.84 -55 02 02.24 3.69 (1.1 ± 0.7) x 10-4 181 3.034 1.641
19 16 39 59.92 -55 10 26.96 3.66 (1.1 ± 0.8) x 10-4 245 3.268 1.477

X-Ray and Gamma Ray Catalogs

More Catalogs

Swift-XRT image with known X-ray and gamma ray sources for 2FGL J1639.7-5504 Swift-XRT image with known radio, optical and UV sources for 2FGL J1639.7-5504

Known X-Ray and Gamma Ray Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Observatory/Database Table
1 1RXS J164023.6-550259 16 40 23.59 -55 02 59.64 5.54 ROSAT
2RXS J164023.7-550259 16 40 23.71 -55 02 58.92 5.56 ROSAT

Known Radio, Optical and UV Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Database Table
1 [PME2013] J1640-5505 16 40 04.80 -55 05 40.92 3.10 AT2FGLUS
[SPT2015] ATCA J1640-5505 16 40 04.99 -55 05 40.92 3.11 FER2FUSRID
MGPS J164005-550544 16 40 05.40 -55 05 44.16 3.20 MGPS2
2 [PME2013] J1639-5501 16 39 50.81 -55 01 04.08 3.21 AT2FGLUS
[SPT2015] ATCA J1639-5501 16 39 50.81 -55 01 04.08 3.21 FER2FUSRID
3 MGPS J163901-551119 16 39 01.70 -55 11 20.04 9.52 MGPS2
4 MGPS J164102-545412 16 41 01.99 -54 54 12.96 14.81 MGPS2

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