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.

4FGL J1740.7-2640

Field

Detected Excesses
Swift-XRT image of the field for 4FGL J1740.7-2640 Swift-XRT detections in the field for 4FGL J1740.7-2640

Detected Excesses (SNR(Sosta) > 3.0)

# R.A. (J2000) Dec. (J2000) Pos. Error (") Rate (cts/s) Counts SNR (Detect) SNR (Sosta)
1 17 40 48.26 -26 39 21.23 4.56 (3.9 ± 1.0) x 10-3 56 4.021 3.829
2 17 40 59.20 -26 40 42.46 4.72 (3.3 ± 1.0) x 10-3 43 3.405 3.440

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 40 30.77 -26 48 03.60 5.02 (2.3 ± 0.8) x 10-3 26 3.260 2.936
2 17 41 31.13 -26 31 50.05 5.76 (1.8 ± 0.6) x 10-3 17 2.717 2.847
3 17 41 23.78 -26 37 52.67 5.44 (1.8 ± 0.7) x 10-3 20 2.850 2.659
4 17 40 48.26 -26 39 21.22 4.56 (2.1 ± 0.8) x 10-3 56 2.570 2.551
5 17 40 38.15 -26 35 44.61 5.31 (1.7 ± 0.7) x 10-3 21 2.453 2.399
6 17 41 44.39 -26 36 53.81 5.49 (1.4 ± 0.6) x 10-3 15 2.549 2.218
7 17 41 02.55 -26 52 26.79 5.08 (1.4 ± 0.6) x 10-3 16 2.982 2.181
8 17 41 47.83 -26 46 42.62 5.28 (9 ± 5) x 10-4 13 2.506 1.612
9 17 40 57.22 -26 48 59.09 4.95 (1.0 ± 0.7) x 10-3 20 2.534 1.564

X-Ray and Gamma Ray Catalogs

More Catalogs
Swift-XRT image with known X-ray and gamma ray sources for 4FGL J1740.7-2640 Swift-XRT image with known radio, optical and UV sources for 4FGL J1740.7-2640

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 8.51 CHANDRA
2 CXOGBS J174123.2-264544 17 41 23.26 -26 45 45.00 10.05 CHANDRA
3 2CXO J174109.3-264917 17 41 09.38 -26 49 18.12 10.30 CHANDRA
X174109.41-264918.0 17 41 09.41 -26 49 18.12 10.30 CHANDRA
CXOGBS J174109.4-264918 17 41 09.41 -26 49 18.12 10.30 CHANDRA
4 CXOGSG J174127.3-264646 17 41 27.41 -26 46 46.56 11.37 CHANDRA
CXOGBS J174127.4-264646 17 41 27.41 -26 46 46.20 11.37 CHANDRA
X174127.41-264646.2 17 41 27.41 -26 46 46.20 11.37 CHANDRA

Known Radio, Optical and UV Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Database Table
1 NSV 23345 17 40 47.50 -26 36 54.00 3.78 GCVSNSVARS
2 NSV 23308 17 40 24.70 -26 39 33.12 4.57 GCVSNSVARS
3 NVSS J174107-264024 17 41 07.10 -26 40 23.88 5.05 NVSS
TGSSADR J174038.9-264539 17 40 39.00 -26 45 38.88 5.19 GMRTAS150M
4 NVSS J174039-264541 17 40 39.00 -26 45 42.12 5.22 NVSS
5 PPM 733414 17 41 07.85 -26 38 02.40 5.81 PPM
6 NSV 23300 17 40 19.99 -26 38 34.08 5.86 GCVSNSVARS
7 NVSS J174111-263956 17 41 11.81 -26 39 56.16 6.12 NVSS
8 NSV 23280 17 40 13.51 -26 41 03.84 6.95 GCVSNSVARS
9 He 2-262 17 40 16.27 -26 44 21.12 7.34 PLNEBULAE
10 NVSS J174012-264422 17 40 12.91 -26 44 21.84 8.00 NVSS
11 NSV 23305 17 40 22.39 -26 34 15.96 8.06 GCVSNSVARS
ESO 173705-2642.7 17 40 12.24 -26 44 16.80 8.09 ESOUPPSALA
12 NSV 23268 17 40 08.30 -26 41 08.16 8.12 GCVSNSVARS
13 NSV 23266 17 40 06.19 -26 40 13.08 8.58 GCVSNSVARS
14 NVSS J174052-264914 17 40 52.30 -26 49 14.88 8.80 NVSS
15 NVSS J174122-263638 17 41 22.70 -26 36 38.88 9.40 NVSS
16 NSV 23271 17 40 08.71 -26 35 00.96 9.78 GCVSNSVARS
17 NSV 23257 17 40 00.70 -26 43 40.08 10.26 GCVSNSVARS
18 NSV 23265 17 40 05.59 -26 35 09.96 10.28 GCVSNSVARS
19 NSV 23359 17 40 57.91 -26 30 09.00 10.89 GCVSNSVARS
20 NSV 23383 17 41 12.50 -26 31 35.04 10.98 GCVSNSVARS
21 NVSS J174001-263446 17 40 01.39 -26 34 46.92 11.27 NVSS
22 PPM 267132 17 40 25.49 -26 29 53.52 11.55 PPM
CD-2612233 17 40 25.49 -26 29 53.16 11.55 ACRS
SAO 185605 17 40 25.51 -26 29 51.72 11.57 SAO
23 TGSSADR J174016.1-265031 17 40 16.20 -26 50 30.84 11.75 GMRTAS150M
24 NSV 23255 17 39 58.51 -26 34 33.96 11.94 GCVSNSVARS
25 NVSS J174120-263045 17 41 20.30 -26 30 46.08 12.69 NVSS
26 NSV 23275 17 40 09.70 -26 28 41.88 14.24 GCVSNSVARS

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