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 J1740.5-2642

Field

Detected Excesses
Swift-XRT image of the field for 3FGL J1740.5-2642 Swift-XRT detections in the field for 3FGL J1740.5-2642

Detected Excesses (SNR(Sosta) > 3.0)

# R.A. (J2000) Dec. (J2000) Pos. Error (") Rate (cts/s) Counts SNR (Detect) SNR (Sosta)
1 17 40 46.66 -26 39 13.49 5.14 (2.9 ± 1.0) x 10-3 25 3.244 3.046

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 17 41 23.83 -26 37 46.40 5.76 (2.2 ± 0.8) x 10-3 17 2.795 2.932
2 17 40 59.60 -26 40 40.67 5.11 (2.6 ± 0.9) x 10-3 29 2.777 2.900
3 17 40 30.80 -26 48 11.86 4.81 (2.6 ± 1.0) x 10-3 35 3.298 2.606
4 17 40 38.53 -26 35 44.62 5.40 (2.0 ± 0.8) x 10-3 17 2.538 2.483
5 17 41 02.46 -26 52 25.75 4.88 (1.6 ± 0.8) x 10-3 17 2.880 2.043

X-Ray and Gamma Ray Catalogs

More Catalogs
Swift-XRT image with known X-ray and gamma ray sources for 3FGL J1740.5-2642 Swift-XRT image with known radio, optical and UV sources for 3FGL J1740.5-2642

Known X-Ray and Gamma Ray Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Observatory/Database Table
1 CXOGBS J174109.5-264703 17 41 09.53 -26 47 03.48 9.29 CHANDRA
2 X174109.41-264918.0 17 41 09.41 -26 49 18.12 10.51 CHANDRA
CXOGBS J174109.4-264918 17 41 09.41 -26 49 18.12 10.51 CHANDRA
3 CXOGSG J174038.3-265410 17 40 38.35 -26 54 11.16 11.56 CHANDRA
X174038.31-265411.5 17 40 38.30 -26 54 11.52 11.57 CHANDRA
4 CXOGBS J174123.2-264544 17 41 23.26 -26 45 45.00 11.68 CHANDRA

Known Radio, Optical and UV Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Database Table
TGSSADR J174038.9-264539 17 40 39.00 -26 45 38.88 3.27 GMRTAS150M
1 NVSS J174039-264541 17 40 39.00 -26 45 42.12 3.31 NVSS
2 NVSS J174012-264422 17 40 12.91 -26 44 21.84 4.74 NVSS
3 NVSS J174052-264914 17 40 52.30 -26 49 14.88 7.87 NVSS
4 NVSS J174107-264024 17 41 07.10 -26 40 23.88 8.01 NVSS
5 TGSSADR J174016.1-265031 17 40 16.20 -26 50 30.84 8.66 GMRTAS150M
6 NVSS J174111-263956 17 41 11.81 -26 39 56.16 9.14 NVSS
7 NVSS J174001-263446 17 40 01.39 -26 34 46.92 10.57 NVSS
8 NVSS J174122-263638 17 41 22.70 -26 36 38.88 12.68 NVSS
9 NVSS J174120-263045 17 41 20.30 -26 30 46.08 15.97 NVSS

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