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 J1721.7-3917

Field

Detected Excesses
Swift-XRT image of the field for 4FGL J1721.7-3917 Swift-XRT detections in the field for 4FGL J1721.7-3917

Detected Excesses (SNR(Sosta) > 3.0)

# R.A. (J2000) Dec. (J2000) Pos. Error (") Rate (cts/s) Counts SNR (Detect) SNR (Sosta)
1 17 21 42.20 -39 22 05.19 4.33 (1.3 ± 0.2) x 10-2 82 8.260 7.905
2 17 22 40.47 -39 15 34.27 4.81 (4.1 ± 0.9) x 10-3 37 4.803 4.517

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 27.23 -39 26 17.31 6.04 (1.2 ± 0.5) x 10-3 14 2.443 2.172
2 17 22 40.47 -39 15 34.27 4.81 (1.4 ± 0.7) x 10-3 37 2.818 2.014

X-Ray and Gamma Ray Catalogs

More Catalogs
Swift-XRT image with known X-ray and gamma ray sources for 4FGL J1721.7-3917 Swift-XRT image with known radio, optical and UV sources for 4FGL J1721.7-3917


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 HD 323164 17 21 49.61 -39 16 23.52 1.86 HDEC
2 NVSS J172153-391958 17 21 53.21 -39 19 58.08 2.81 NVSS
3 QORG J172135.8-392045 17 21 35.81 -39 20 44.88 3.27 QORGCAT
4 NVSS J172133-391320 17 21 33.50 -39 13 19.92 4.92 NVSS
5 NVSS J172121-391516 17 21 21.79 -39 15 15.84 4.95 NVSS
6 NVSS J172129-392219 17 21 29.40 -39 22 18.84 5.26 NVSS
7 NVSS J172124-391308 17 21 24.60 -39 13 09.12 5.98 NVSS
8 HD 323165 17 22 12.89 -39 21 13.32 6.59 HDEC
9 HD 323166 17 22 18.65 -39 16 34.32 6.90 HDEC
TGSSADR J172216.1-391448 17 22 16.20 -39 14 48.84 6.99 GMRTAS150M
MGPS J172216-391449 17 22 16.20 -39 14 48.84 7.00 MGPS2
10 NVSS J172216-391447 17 22 16.39 -39 14 47.04 7.06 NVSS
11 NVSS J172153-391041 17 21 53.11 -39 10 41.16 7.40 NVSS
12 PGCC G348.68-1.61 17 22 23.30 -39 19 09.12 7.78 PLANCKGCC
13 MGPS J172158-390959 17 21 58.61 -39 10 00.12 8.37 MGPS2
14 NVSS J172229-391725 17 22 29.59 -39 17 26.16 8.90 NVSS
15 NVSS J172100-391405 17 21 00.70 -39 14 06.00 9.12 NVSS
16 NVSS J172231-391545 17 22 31.80 -39 15 46.08 9.56 NVSS
17 QORG J172101.4-391242 17 21 01.39 -39 12 42.12 9.66 QORGCAT
18 HD 323163 17 21 11.74 -39 10 21.36 9.71 HDEC
19 NVSS J172101-391157 17 21 01.20 -39 11 57.12 10.11 NVSS
20 NVSS J172200-392731 17 22 00.10 -39 27 32.04 10.19 NVSS
21 NVSS J172207-392718 17 22 07.30 -39 27 18.00 10.51 NVSS
22 NVSS J172233-392255 17 22 33.70 -39 22 55.92 10.94 NVSS
23 NVSS J172238-391423 17 22 38.40 -39 14 24.00 11.15 NVSS
24 NVSS J172232-392403 17 22 32.90 -39 24 03.96 11.37 NVSS
25 NVSS J172157-392903 17 21 57.19 -39 29 03.12 11.51 NVSS
26 NVSS J172238-392228 17 22 38.71 -39 22 27.84 11.61 NVSS
27 QORG J172224.7-390715 17 22 24.70 -39 07 14.88 13.26 QORGCAT
28 NVSS J172225-390603 17 22 25.51 -39 06 03.96 14.31 NVSS
29 HD 323155 17 22 30.82 -39 06 37.08 14.48 HDEC

Penn State University Goddard Space Flight Center Swift