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 J1656.4-0410

Field

Detected Excesses
Swift-XRT image of the field for 4FGL J1656.4-0410 Swift-XRT detections in the field for 4FGL J1656.4-0410

Detected Excesses (SNR(Sosta) > 3.0)

# R.A. (J2000) Dec. (J2000) Pos. Error (") Rate (cts/s) Counts SNR (Detect) SNR (Sosta)
1 16 56 52.45 -04 14 46.56 4.54 (3.8 ± 0.7) x 10-3 48 5.854 5.562
2 16 56 15.42 -04 10 50.79 5.89 (1.5 ± 0.4) x 10-3 23 2.819 3.340

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 16 56 23.05 -04 01 30.30 5.17 (1.0 ± 0.4) x 10-3 26 2.719 2.682
2 16 56 43.80 -03 59 40.07 5.00 (1.2 ± 0.5) x 10-3 16 2.676 2.662
3 16 57 05.78 -04 01 21.55 5.08 (1.0 ± 0.4) x 10-3 18 2.688 2.606
4 16 57 26.56 -04 05 36.87 5.35 (10 ± 4) x 10-4 15 2.535 2.488

X-Ray and Gamma Ray Catalogs

More Catalogs
Swift-XRT image with known X-ray and gamma ray sources for 4FGL J1656.4-0410 Swift-XRT image with known radio, optical and UV sources for 4FGL J1656.4-0410

Known X-Ray and Gamma Ray Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Observatory/Database Table
1 2RXP J165652.4-041443 16 56 52.34 -04 14 43.08 7.43 ROSAT
1WGA J1656.8-0413 16 56 52.10 -04 14 48.12 7.43 ROSAT
1RXS J165653.0-041435 16 56 52.99 -04 14 35.52 7.48 ROSAT
2 1RXS J165707.7-041856 16 57 07.70 -04 18 56.16 13.07 ROSAT
MS1654.4-0415 16 57 04.42 -04 20 26.16 13.57 EINSTEIN
2E 1654.4-0415 16 57 04.66 -04 20 28.32 13.63 EINSTEIN
2E 1654.4-0415 16 57 04.73 -04 20 28.68 13.65 EINSTEIN
3 GJ 1207 16 57 04.99 -04 20 42.00 13.86 ROSAT
2RXP J165705.4-042047 16 57 05.35 -04 20 47.04 13.98 ROSAT
1WGA J1657.0-0419 16 57 04.90 -04 20 53.16 13.98 ROSAT
GJ 1207 16 57 05.69 -04 20 47.04 14.04 ROSAT
1RXS J165705.7-042047 16 57 05.69 -04 20 47.04 14.04 ROSAT
1RXS J165705.7-042047 16 57 05.69 -04 20 47.40 14.04 ROSAT
2RXS J165705.4-042051 16 57 05.45 -04 20 52.08 14.06 ROSAT
2RXS J165705.4-042051 16 57 05.45 -04 20 52.08 14.06 ROSAT
PMI J16570-0420 16 57 05.71 -04 20 56.04 14.15 ROSAT/XMM
4 1RXS J165715.9-041945 16 57 15.91 -04 19 45.12 15.16 ROSAT

Known Radio, Optical and UV Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Database Table
1 HIP 82905 16 56 30.19 -04 10 01.56 0.43 HIPPARCOS
PPM 200190 16 56 30.19 -04 10 01.56 0.43 PPM
BD -03 4029 16 56 30.19 -04 10 01.56 0.43 HIC
2 NVSS J165631-041452 16 56 31.80 -04 14 52.08 4.72 NVSS
3 QORG J165704.3-041105 16 57 04.30 -04 11 04.92 8.93 QORGCAT
4 SPASS J165703-040747 16 57 03.41 -04 07 48.00 8.98 SPASS2P3GH
5 WDS J16570-0405 16 57 00.00 -04 04 59.88 9.39 WDS
6 NVSS J165630-041945 16 56 30.50 -04 19 45.12 9.55 NVSS
7 NVSS J165708-040917 16 57 07.99 -04 09 16.92 9.85 NVSS
VLSSr J165707.5-040817 16 57 07.51 -04 08 17.88 9.87 VLSSR
TXS 1654-040 16 57 07.70 -04 08 21.12 9.91 TEXAS
8 NVSS J165707-040821 16 57 07.70 -04 08 21.84 9.92 NVSS
TGSSADR J165707.7-040822 16 57 07.70 -04 08 22.92 9.92 GMRTAS150M
GLEAM J165707-040818 16 57 07.80 -04 08 17.88 9.95 GLEAMEGCAT
TGSSADR J165627.0-040015 16 56 27.10 -04 00 15.12 9.97 GMRTAS150M
9 NVSS J165626-040015 16 56 26.81 -04 00 15.12 9.97 NVSS
1654-040 16 57 08.11 -04 08 15.00 10.03 MRC
10 1654-0402L 16 57 07.90 -04 07 33.96 10.13 NORTH20CM
11 M 10 16 57 05.95 -04 05 60.00 10.21 MESSIER
NGC 6254 16 57 06.00 -04 05 60.00 10.22 NGC2000
GLEAM J165554-041615 16 55 54.31 -04 16 15.96 10.49 GLEAMEGCAT
12 NVSS J165554-041626 16 55 54.41 -04 16 27.12 10.58 NVSS
TGSSADR J165554.4-041627 16 55 54.41 -04 16 27.84 10.58 GMRTAS150M
13 NVSS J165620-042053 16 56 20.30 -04 20 53.16 10.88 NVSS
14 NGC 6254 16 57 09.05 -04 06 01.08 10.91 GLOBCLUST
15 PMN J1657-0407 16 57 11.40 -04 07 49.08 10.92 PMN
16 NVSS J165715-040835 16 57 15.70 -04 08 35.16 11.85 NVSS
17 NVSS J165653-042052 16 56 54.00 -04 20 53.16 12.40 NVSS
18 OS-091 16 57 00.19 -04 00 38.16 12.41 DIXON
19 686- 27 16 57 04.51 -04 20 37.32 13.72 NLTT
GJ 1207 16 57 04.61 -04 20 37.32 13.74 CNS3
GJ 1207 16 57 05.40 -04 20 52.08 14.05 PMSUCAT
LHS 3255 16 57 05.81 -04 20 57.12 14.18 REVISEDLHS

Penn State University Goddard Space Flight Center Swift