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 J1721.8-3919

Field

Detected Excesses

Swift-XRT image of the field for 3FGL J1721.8-3919 Swift-XRT detections in the field for 3FGL J1721.8-3919

Detected Excesses (SNR(Sosta) > 3.0)

# R.A. (J2000) Dec. (J2000) Pos. Error (") Rate (cts/s) Counts SNR (Detect) SNR (Sosta)
1 17 21 42.13 -39 22 04.73 4.33 (1.3 ± 0.2) x 10-2 87 7.902 8.141
2 17 22 40.28 -39 15 36.65 4.80 (4.0 ± 0.9) x 10-3 37 5.005 4.421

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 22 27.01 -39 26 17.44 5.96 (1.6 ± 0.6) x 10-3 15 2.351 2.458
2 17 22 40.28 -39 15 36.65 4.80 (1.6 ± 0.7) x 10-3 37 2.934 2.115

X-Ray and Gamma Ray Catalogs

More Catalogs

Swift-XRT image with known X-ray and gamma ray sources for 3FGL J1721.8-3919 Swift-XRT image with known radio, optical and UV sources for 3FGL J1721.8-3919


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 J172153-391958 17 21 53.21 -39 19 58.08 0.57 NVSS
2 NVSS J172129-392219 17 21 29.40 -39 22 18.84 5.07 NVSS
MGPS J172216-391449 17 22 16.20 -39 14 48.84 6.75 MGPS2
TGSSADR J172216.1-391448 17 22 16.20 -39 14 48.84 6.75 GMRTAS150M
3 NVSS J172216-391447 17 22 16.39 -39 14 47.04 6.81 NVSS
4 NVSS J172133-391320 17 21 33.50 -39 13 19.92 7.08 NVSS
5 NVSS J172121-391516 17 21 21.79 -39 15 15.84 7.12 NVSS
6 NVSS J172229-391725 17 22 29.59 -39 17 26.16 7.71 NVSS
7 NVSS J172200-392731 17 22 00.10 -39 27 32.04 8.17 NVSS
8 NVSS J172124-391308 17 21 24.60 -39 13 09.12 8.22 NVSS
9 NVSS J172207-392718 17 22 07.30 -39 27 18.00 8.36 NVSS
10 NVSS J172231-391545 17 22 31.80 -39 15 46.08 8.71 NVSS
11 NVSS J172153-391041 17 21 53.11 -39 10 41.16 8.86 NVSS
12 NVSS J172233-392255 17 22 33.70 -39 22 55.92 8.89 NVSS
13 NVSS J172232-392403 17 22 32.90 -39 24 03.96 9.24 NVSS
14 NVSS J172157-392903 17 21 57.19 -39 29 03.12 9.59 NVSS
15 NVSS J172238-392228 17 22 38.71 -39 22 27.84 9.63 NVSS
16 MGPS J172158-390959 17 21 58.61 -39 10 00.12 9.65 MGPS2
17 NVSS J172153-392956 17 21 53.81 -39 29 57.12 10.42 NVSS
18 NVSS J172238-391423 17 22 38.40 -39 14 24.00 10.47 NVSS
19 NVSS J172138-392959 17 21 39.00 -39 29 58.92 10.72 NVSS
20 NVSS J172100-391405 17 21 00.70 -39 14 06.00 11.20 NVSS
21 NVSS J172249-391823 17 22 49.39 -39 18 24.12 11.31 NVSS
22 MGPS J172246-391445 17 22 46.10 -39 14 44.88 11.65 MGPS2
23 NVSS J172134-393104 17 21 34.39 -39 31 05.16 11.99 NVSS
MGPS J172246-392503 17 22 46.39 -39 25 04.08 12.00 MGPS2
TGSSADR J172246.6-392504 17 22 46.70 -39 25 04.08 12.06 GMRTAS150M
24 NVSS J172246-392507 17 22 46.61 -39 25 06.96 12.06 NVSS
25 NVSS J172101-391157 17 21 01.20 -39 11 57.12 12.30 NVSS
MGPS J172230-393109 17 22 30.50 -39 31 09.84 13.88 MGPS2
26 NVSS J172231-393113 17 22 31.80 -39 31 13.08 14.06 NVSS

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