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 19.32 3.69 (1.41 ± 0.12) x 10-3 244 11.830 11.350
2 16 40 07.49 -55 05 37.87 3.61 (1.5 ± 0.2) x 10-3 560 11.140 10.010
3 16 40 39.17 -55 11 18.57 3.66 (9.9 ± 1.2) x 10-4 255 8.909 8.452
4 16 40 12.24 -54 53 32.54 3.78 (6.5 ± 0.9) x 10-4 154 7.869 7.460
5 16 40 06.18 -54 59 39.90 3.69 (8.0 ± 1.1) x 10-4 226 7.413 7.205
6 16 38 40.77 -55 06 41.02 3.80 (5.6 ± 0.8) x 10-4 141 6.762 6.748
7 16 39 31.71 -55 05 56.99 3.65 (7.4 ± 1.1) x 10-4 387 7.064 6.692
8 16 39 34.84 -54 57 49.18 3.74 (5.3 ± 0.9) x 10-4 164 6.104 5.844
9 16 39 09.71 -55 07 23.31 3.69 (5.8 ± 1.0) x 10-4 252 5.679 5.542
10 16 40 22.82 -55 01 36.97 3.68 (5.7 ± 1.0) x 10-4 227 5.561 5.484
11 16 40 25.09 -55 00 41.72 3.67 (5.5 ± 1.0) x 10-4 236 5.733 5.396
12 16 40 00.58 -55 10 26.72 3.66 (6.0 ± 1.1) x 10-4 234 5.859 5.364
13 16 39 52.61 -55 11 00.38 3.68 (5.6 ± 1.1) x 10-4 227 4.940 5.149
14 16 40 09.90 -54 55 11.07 3.75 (3.9 ± 0.8) x 10-4 155 4.876 5.048
15 16 40 48.13 -54 55 47.95 3.74 (4.0 ± 0.8) x 10-4 132 6.068 4.995
16 16 40 50.07 -54 58 29.53 3.74 (4.1 ± 0.8) x 10-4 115 5.291 4.884
17 16 40 24.97 -55 06 57.17 3.67 (4.7 ± 1.0) x 10-4 250 3.909 4.837
18 16 39 45.80 -54 55 13.74 3.76 (4.3 ± 0.9) x 10-4 149 5.007 4.805
19 16 40 17.80 -55 05 41.05 3.65 (4.8 ± 1.0) x 10-4 285 5.895 4.683
20 16 39 47.21 -54 51 55.10 3.99 (4.0 ± 0.9) x 10-4 63 4.333 4.498
21 16 38 58.40 -55 05 52.81 3.69 (4.0 ± 0.9) x 10-4 202 4.801 4.476
22 16 39 22.87 -55 08 39.99 3.67 (4.2 ± 0.9) x 10-4 258 5.191 4.406
23 16 39 50.68 -55 00 46.50 3.72 (3.9 ± 0.9) x 10-4 240 4.572 4.403
24 16 39 27.09 -54 58 03.73 3.74 (3.6 ± 0.8) x 10-4 175 3.895 4.398
25 16 40 56.20 -54 59 25.24 3.74 (3.1 ± 0.8) x 10-4 128 5.058 4.140
26 16 38 52.76 -54 54 56.58 3.81 (2.9 ± 0.7) x 10-4 104 5.355 4.139
27 16 39 03.52 -55 13 15.90 3.88 (2.7 ± 0.7) x 10-4 81 4.218 4.018
28 16 39 14.79 -55 05 33.86 3.68 (3.6 ± 0.9) x 10-4 268 4.051 3.987
29 16 39 39.97 -55 03 42.96 3.67 (3.6 ± 1.0) x 10-4 364 3.440 3.747
30 16 39 07.19 -55 02 15.48 3.69 (3.2 ± 1.0) x 10-4 205 3.729 3.339
31 16 40 36.12 -54 56 02.87 3.77 (2.0 ± 0.7) x 10-4 120 3.616 3.104
32 16 40 56.26 -55 03 19.70 3.73 (2.4 ± 0.8) x 10-4 130 3.625 3.035

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 39.08 -55 11 17.43 3.66 (4.6 ± 1.0) x 10-4 259 5.974 4.701
2 16 40 07.49 -55 05 37.87 3.61 (4.4 ± 1.0) x 10-4 560 5.814 4.193
3 16 39 31.75 -55 05 58.94 3.65 (3.8 ± 0.9) x 10-4 369 3.691 4.040
4 16 39 52.98 -55 10 59.67 3.68 (2.7 ± 0.8) x 10-4 243 3.782 3.323
5 16 40 56.98 -55 01 18.63 3.76 (1.8 ± 0.6) x 10-4 125 3.070 2.924
6 16 39 09.82 -54 52 57.35 3.78 (1.7 ± 0.6) x 10-4 91 3.842 2.923
7 16 39 00.20 -55 08 29.45 3.71 (2.4 ± 0.8) x 10-4 156 3.070 2.913
8 16 39 15.31 -55 05 26.40 3.68 (2.3 ± 0.8) x 10-4 285 3.168 2.899
9 16 40 41.55 -55 07 45.16 3.68 (2.4 ± 0.9) x 10-4 200 3.104 2.832
10 16 40 37.86 -54 54 53.55 3.77 (1.9 ± 0.7) x 10-4 86 3.136 2.737
11 16 39 09.71 -55 07 23.31 3.69 (2.3 ± 0.9) x 10-4 252 3.679 2.708
12 16 40 46.33 -55 04 56.22 3.68 (2.3 ± 0.9) x 10-4 198 3.286 2.697
13 16 40 49.28 -55 04 58.76 3.68 (2.1 ± 0.8) x 10-4 172 4.557 2.609
14 16 40 34.98 -55 10 57.42 3.66 (2.2 ± 0.9) x 10-4 204 3.925 2.570
15 16 40 42.31 -55 07 25.51 3.68 (2.0 ± 0.8) x 10-4 198 3.097 2.485
16 16 40 56.70 -54 56 03.16 3.80 (1.6 ± 0.6) x 10-4 107 3.561 2.458
17 16 40 48.04 -55 01 16.45 3.70 (1.8 ± 0.7) x 10-4 150 3.104 2.438
18 16 39 02.12 -55 01 33.43 3.69 (1.7 ± 0.8) x 10-4 206 3.214 2.201
19 16 40 07.49 -55 05 37.90 3.61 (2.2 ± 1.0) x 10-4 558 3.884 2.144
20 16 40 40.88 -55 02 02.49 3.69 (1.1 ± 0.7) x 10-4 182 3.036 1.641
21 16 39 59.85 -55 10 27.08 3.66 (1.1 ± 0.8) x 10-4 244 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

Penn State University Goddard Space Flight Center Swift