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.

1FGL J1656.2-3257

Field

Detected Excesses

Swift-XRT image of the field for 1FGL J1656.2-3257 Swift-XRT detections in the field for 1FGL J1656.2-3257

Detected Excesses (SNR(Sosta) > 3.0)

# R.A. (J2000) Dec. (J2000) Pos. Error (") Rate (cts/s) Counts SNR (Detect) SNR (Sosta)
1 16 56 16.85 -33 02 11.19 3.59 (9.2 ± 0.3) x 10-2 951 28.280 29.220
2 16 55 57.65 -32 59 47.23 4.00 (1.39 ± 0.13) x 10-2 153 10.940 11.030
3 16 56 28.39 -33 05 28.86 4.47 (4.9 ± 0.8) x 10-3 58 6.569 6.452
4 16 55 43.17 -32 54 27.47 5.49 (1.8 ± 0.5) x 10-3 26 3.748 3.845
5 16 56 33.99 -32 55 35.98 5.11 (1.8 ± 0.5) x 10-3 29 3.785 3.601
6 16 56 43.63 -33 01 49.88 4.67 (1.8 ± 0.5) x 10-3 33 4.151 3.526

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 55 28.86 -32 56 40.38 5.02 (1.2 ± 0.4) x 10-3 24 3.397 2.841
2 16 55 59.34 -33 05 47.47 5.40 (1.1 ± 0.4) x 10-3 20 2.927 2.670
3 16 55 41.95 -32 57 45.43 5.02 (1.1 ± 0.4) x 10-3 25 2.884 2.552
4 16 55 48.45 -33 08 03.94 5.31 (7 ± 3) x 10-4 13 2.448 2.002

X-Ray and Gamma Ray Catalogs

More Catalogs

Swift-XRT image with known X-ray and gamma ray sources for 1FGL J1656.2-3257 Swift-XRT image with known radio, optical and UV sources for 1FGL J1656.2-3257

Known X-Ray and Gamma Ray Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Observatory/Database Table
1 1RXS J165559.6-325628 16 55 59.59 -32 56 27.96 2.92 ROSAT
1RXS J165616.6-330150 16 56 16.61 -33 01 50.52 4.82 ROSAT
2 XMMSL1 J165616.4-330203 16 56 16.44 -33 02 02.76 5.01 XMM-NEWTON
3 1RXS J165641.9-330336 16 56 41.90 -33 03 36.00 8.87 ROSAT

Known Radio, Optical and UV Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Database Table
1 OS-389 16 56 32.30 -32 56 40.92 4.02 DIXON
AT20G J165616-330207 16 56 16.80 -33 02 08.16 5.11 AT20G
MGPS J165616-330210 16 56 16.80 -33 02 09.96 5.15 MGPS2
2 NVSS J165616-330211 16 56 16.80 -33 02 12.12 5.17 NVSS
IGR J16562-3301 16 56 16.80 -33 02 12.12 5.18 VERONCAT
3 PPM 748145 16 55 43.22 -32 55 39.72 6.45 PPM
4 NVSS J165649-325928 16 56 49.51 -32 59 29.04 7.98 NVSS
MGPS J165649-325929 16 56 49.61 -32 59 29.04 8.01 MGPS2
5 WDS J16564-3249 16 56 24.00 -32 49 00.12 8.39 WDS
MGPS J165529-330011 16 55 29.30 -33 00 11.16 9.72 MGPS2
6 NVSS J165528-330006 16 55 28.80 -33 00 06.84 9.78 NVSS
7 NVSS J165522-325904 16 55 22.90 -32 59 04.92 10.74 NVSS
8 NVSS J165523-325406 16 55 23.30 -32 54 06.84 10.88 NVSS
9 SAO 208194 16 55 30.55 -33 04 30.72 11.63 SAO
CD-3212153 16 55 30.50 -33 04 31.44 11.64 ACRS
PPM 295660 16 55 30.50 -33 04 31.80 11.65 PPM
10 NVSS J165535-324805 16 55 35.71 -32 48 05.04 11.95 NVSS
11 SAO 208218 16 56 33.79 -32 45 50.76 12.04 SAO
CD-3212169 16 56 33.70 -32 45 47.88 12.07 ACRS
PPM 295688 16 56 33.70 -32 45 47.16 12.09 PPM
12 SAO 208193 16 55 30.48 -33 05 12.48 12.10 SAO
CD-3212152 16 55 30.31 -33 05 14.28 12.14 ACRS
PPM 295659 16 55 30.29 -33 05 14.28 12.15 PPM
13 SAO 208199 16 55 44.98 -33 08 00.60 12.43 SAO
CD-3212156 16 55 44.90 -33 08 01.68 12.45 ACRS
PPM 295666 16 55 44.90 -33 08 01.68 12.45 PPM
14 PPM 748165 16 56 43.42 -32 45 17.28 13.39 PPM

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