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 J1857.9+0355

Field

Detected Excesses

Swift-XRT image of the field for 3FGL J1857.9+0355 Swift-XRT detections in the field for 3FGL J1857.9+0355


No detected excesses found.

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 57 44.92 +03 46 26.11 6.65 (3.7 ± 1.4) x 10-3 12 3.227 2.737
2 18 57 28.31 +03 53 56.03 6.93 (2.6 ± 1.2) x 10-3 9 2.405 2.180
3 18 57 39.41 +03 48 31.82 7.97 (2.0 ± 1.0) x 10-3 6 2.178 2.098

X-Ray and Gamma Ray Catalogs

More Catalogs

Swift-XRT image with known X-ray and gamma ray sources for 3FGL J1857.9+0355 Swift-XRT image with known radio, optical and UV sources for 3FGL J1857.9+0355

Known X-Ray and Gamma Ray Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Observatory/Database Table
1 1RXS J185744.5+034631 18 57 44.50 +03 46 31.08 9.69 ROSAT
2RXS J185744.4+034627 18 57 44.45 +03 46 27.48 9.75 ROSAT

Known Radio, Optical and UV Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Database Table
1 [PME2013] J1858+0353 18 58 02.69 +03 53 11.04 2.83 AT2FGLUS
[SPT2015] ATCA J1858+0353 18 58 02.81 +03 53 09.96 2.85 FER2FUSRID
[WBH2005] G37.141+0.304 18 58 02.50 +03 53 02.04 2.94 WBHGP6CM
2 NVSS J185747+035206 18 57 47.11 +03 52 05.88 4.38 NVSS
3 NVSS J185815+035526 18 58 15.41 +03 55 26.04 4.52 NVSS
[WBH2005] G37.202+0.275 18 58 15.50 +03 55 30.00 4.54 WBHGP20CM
[WBH2005] G37.202+0.275 18 58 15.50 +03 55 30.00 4.55 WBHGP6CM
[SPT2015] VLA J1858+0355 18 58 15.60 +03 55 30.00 4.55 FER2FUSRID
[PME2013] J1858+0355 18 58 15.60 +03 55 33.96 4.58 AT2FGLUS
4 NVSS J185815+035404 18 58 15.41 +03 54 03.96 4.80 NVSS
5 NVSS J185741+035938 18 57 41.81 +03 59 38.04 5.54 NVSS
6 [SPT2015] ATCA J1858+0352 18 58 15.70 +03 52 13.08 5.74 FER2FUSRID
7 NVSS J185743+035102 18 57 43.70 +03 51 02.16 5.75 NVSS
8 NVSS J185744+040105 18 57 44.11 +04 01 05.88 6.35 NVSS
9 NVSS J185745+034953 18 57 45.50 +03 49 53.04 6.49 NVSS
10 NVSS J185821+035258 18 58 21.19 +03 52 59.16 6.54 NVSS
[PME2013] J1857+0353 18 57 30.19 +03 53 12.84 7.21 AT2FGLUS
TGSSADR J185729.9+035310 18 57 29.90 +03 53 09.96 7.27 GMRTAS150M
[SPT2015] VLA J1857+0353 18 57 30.00 +03 53 08.16 7.27 FER2FUSRID
[WBH2005] G37.080+0.425 18 57 30.00 +03 53 07.08 7.28 WBHGP20CM
11 NVSS J185729+035308 18 57 29.81 +03 53 08.16 7.31 NVSS
[WBH2005] G37.301+0.321 18 58 16.39 +04 02 03.84 7.97 WBHGP6CM
12 NVSS J185817+040212 18 58 17.81 +04 02 12.12 8.30 NVSS
[WBH2005] G37.306+0.317 18 58 17.90 +04 02 12.84 8.31 WBHGP20CM
[WBH2005] G37.306+0.317 18 58 17.81 +04 02 12.84 8.32 WBHGP6CM
[SPT2015] ATCA J1858+0402 18 58 18.19 +04 02 12.12 8.36 FER2FUSRID
13 NVSS J185747+040515 18 57 47.11 +04 05 16.08 9.93 NVSS
14 NVSS J185733+040426 18 57 33.10 +04 04 26.04 10.64 NVSS
15 NVSS J185728+034744 18 57 28.39 +03 47 44.16 10.72 NVSS
[WBH2005] G36.997+0.388 18 57 28.70 +03 47 39.84 10.73 WBHGP6CM
[WBH2005] G36.997+0.388 18 57 28.61 +03 47 39.12 10.74 WBHGP20CM
16 PSR J1858+0346 18 58 22.39 +03 46 37.92 10.99 ATNFPULSAR
17 [WBH2005] G37.047+0.201 18 58 14.30 +03 45 11.88 11.29 WBHGP6CM
18 NVSS J185720+040305 18 57 20.40 +04 03 06.12 11.82 NVSS
19 NVSS J185840+040040 18 58 40.51 +04 00 41.04 11.88 NVSS
20 TGSSADR J185711.7+034650 18 57 11.71 +03 46 50.88 14.39 GMRTAS150M
21 NVSS J185837+034517 18 58 37.30 +03 45 16.92 14.40 NVSS

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