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 J1808.3-3357

Field

Detected Excesses

Swift-XRT image of the field for 3FGL J1808.3-3357 Swift-XRT detections in the field for 3FGL J1808.3-3357

Detected Excesses (SNR(Sosta) > 3.0)

# R.A. (J2000) Dec. (J2000) Pos. Error (") Rate (cts/s) Counts SNR (Detect) SNR (Sosta)
1 18 08 52.72 -33 52 33.96 4.63 (1.7 ± 0.5) x 10-3 37 3.567 3.482
2 18 08 13.04 -33 57 30.64 4.46 (2.0 ± 0.6) x 10-3 50 3.157 3.173

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 08 51.33 -33 56 51.04 4.44 (1.4 ± 0.5) x 10-3 51 3.499 2.985
2 18 08 17.90 -33 51 51.83 4.88 (1.1 ± 0.4) x 10-3 35 2.926 2.467
3 18 08 32.37 -34 00 45.32 4.41 (1.1 ± 0.5) x 10-3 52 2.608 2.395
4 18 08 19.92 -33 58 03.79 4.24 (1.1 ± 0.5) x 10-3 77 2.954 2.310
5 18 08 23.78 -33 56 30.19 4.48 (8 ± 4) x 10-4 52 2.950 1.999

X-Ray and Gamma Ray Catalogs

More Catalogs

Swift-XRT image with known X-ray and gamma ray sources for 3FGL J1808.3-3357 Swift-XRT image with known radio, optical and UV sources for 3FGL J1808.3-3357


No known X-ray or gamma ray sources found.

Known Radio, Optical and UV Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Database Table
1 NVSS J180823-335946 18 08 23.71 -33 59 47.04 1.99 NVSS
2 [PME2013] J1808-3355 18 08 14.59 -33 55 03.00 3.27 AT2FGLUS
[SPT2015] ATCA J1808-3355 18 08 14.59 -33 55 03.00 3.28 FER2FUSRID
[PME2013] J1807-3355 18 07 51.31 -33 55 32.88 7.00 AT2FGLUS
3 NVSS J180751-335529 18 07 51.31 -33 55 30.00 7.02 NVSS
[SPT2015] ATCA J1807-3355 18 07 51.19 -33 55 31.08 7.02 FER2FUSRID
MGPS J180751-335524 18 07 51.10 -33 55 23.88 7.08 MGPS2
TGSSADR J180750.7-335535 18 07 50.81 -33 55 36.12 7.08 GMRTAS150M
4 NVSS J180841-335103 18 08 41.21 -33 51 03.96 7.70 NVSS
5 NVSS J180914-335415 18 09 14.71 -33 54 15.12 11.24 NVSS
6 NVSS J180751-334827 18 07 51.91 -33 48 28.08 11.38 NVSS
MGPS J180751-334825 18 07 51.79 -33 48 25.92 11.41 MGPS2
TGSSADR J180751.8-334825 18 07 51.91 -33 48 24.84 11.41 GMRTAS150M
7 NVSS J180727-334903 18 07 27.60 -33 49 04.08 14.47 NVSS
TGSSADR J180727.6-334903 18 07 27.60 -33 49 03.00 14.47 GMRTAS150M
MGPS J180727-334903 18 07 27.50 -33 49 03.00 14.49 MGPS2
TGSSADR J180725.4-340725 18 07 25.51 -34 07 26.04 15.37 GMRTAS150M
MGPS J180725-340731 18 07 25.39 -34 07 31.08 15.42 MGPS2
8 NVSS J180725-340732 18 07 25.39 -34 07 32.16 15.44 NVSS

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