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 J1657.4-3917c

Field

Detected Excesses
Swift-XRT image of the field for 4FGL J1657.4-3917c Swift-XRT detections in the field for 4FGL J1657.4-3917c

Detected Excesses (SNR(Sosta) > 3.0)

# R.A. (J2000) Dec. (J2000) Pos. Error (") Rate (cts/s) Counts SNR (Detect) SNR (Sosta)
1 16 56 42.57 -39 08 15.32 4.78 (4.0 ± 0.7) x 10-2 42 6.573 5.898

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 49.90 -39 05 37.73 7.48 (1.8 ± 0.6) x 10-2 10 2.958 2.992

X-Ray and Gamma Ray Catalogs

More Catalogs
Swift-XRT image with known X-ray and gamma ray sources for 4FGL J1657.4-3917c Swift-XRT image with known radio, optical and UV sources for 4FGL J1657.4-3917c

Known X-Ray and Gamma Ray Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Observatory/Database Table
1 1RXS J165643.3-390925 16 56 43.32 -39 09 24.84 11.35 ROSAT
2 1RXS J165633.9-390843 16 56 33.91 -39 08 43.08 13.15 ROSAT
3 2RXS J165648.9-390555 16 56 48.98 -39 05 55.68 13.46 ROSAT
1RXS J165649.0-390552 16 56 49.01 -39 05 52.44 13.50 ROSAT
1RXS J165649.0-390552 16 56 49.01 -39 05 52.08 13.50 ROSAT
V914 Sco 16 56 49.01 -39 05 48.12 13.56 ROSAT

Known Radio, Optical and UV Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Database Table
1 NVSS J165734-392000 16 57 34.20 -39 20 00.96 3.15 NVSS
2 PGCC G345.83+2.35 16 57 10.51 -39 15 10.08 3.56 PLANCKGCC
3 PGCC G345.71+2.24 16 57 12.91 -39 24 47.88 7.66 PLANCKGCC
4 HD 322376 16 57 13.06 -39 25 19.56 8.15 HDEC
MGPS J165640-391526 16 56 40.20 -39 15 25.92 8.82 MGPS2
5 NVSS J165640-391526 16 56 40.10 -39 15 25.92 8.84 NVSS
6 PPM 748183 16 58 03.17 -39 23 01.32 9.30 PPM
7 SCO 16 57 51.53 -39 09 25.92 9.60 WOODEBCAT
8 NVSS J165640-391226 16 56 40.80 -39 12 25.92 9.86 NVSS
9 NVSS J165710-390711 16 57 10.39 -39 07 12.00 10.65 NVSS
MGPS J165710-390711 16 57 10.20 -39 07 10.92 10.66 MGPS2
MGPS J165717-392803 16 57 17.50 -39 28 04.08 10.67 MGPS2
10 NVSS J165716-392811 16 57 16.99 -39 28 12.00 10.81 NVSS
11 GPA 345.65+2.34 16 56 37.90 -39 23 44.16 10.97 GPA
12 HD 322369 16 57 03.43 -39 06 46.80 11.46 HDEC
13 PPM 295714 16 57 50.23 -39 06 57.24 11.65 PPM
SAO 208237 16 57 50.14 -39 06 56.52 11.65 SAO
CD-3811363 16 57 50.23 -39 06 56.88 11.65 ACRS
HD 152885 16 57 50.23 -39 06 56.88 11.65 HIC
HIP 83014 16 57 50.23 -39 06 56.52 11.66 HIPPARCOS
V1071 Sco 16 57 50.23 -39 06 56.52 11.66 GCVS
14 PPM 748159 16 56 24.29 -39 18 05.40 11.67 PPM
CD-3910896 16 56 24.24 -39 18 05.40 11.68 ACRS
15 HD 322377 16 57 30.31 -39 29 27.60 12.03 HDEC
16 CD-3811340 16 56 42.60 -39 08 14.28 12.31 ACRS
PPM 295695 16 56 42.67 -39 08 13.20 12.31 PPM
SAO 208217 16 56 42.60 -39 08 12.84 12.33 SAO
WDS J16567-3908 16 56 42.00 -39 07 59.88 12.56 WDS
17 EUVE J1656-39.1 16 56 43.01 -39 07 37.92 12.72 EUVEBSL
2RE J1656-390 16 56 44.71 -39 07 18.84 12.76 ROSWFC2RE
18 NSV 8069 16 58 22.61 -39 23 49.92 12.90 GCVSNSVARS
19 NVSS J165823-392442 16 58 23.30 -39 24 42.84 13.46 NVSS
20 WDS J16568-3906 AC 16 56 48.00 -39 06 00.00 13.49 WDS
WDS J16568-3906 AB 16 56 48.00 -39 06 00.00 13.49 WDS
EUVE J1656-391 16 56 40.01 -39 07 05.88 13.50 EUVECAT2
EUVE J1656-391 16 56 40.01 -39 07 05.88 13.50 EUVECAT2
MGPS J165823-392440 16 58 23.69 -39 24 39.96 13.51 MGPS2
HD 322378 16 58 24.38 -39 24 49.68 13.71 HDEC
PPM 748187 16 58 24.38 -39 24 50.04 13.71 PPM
V914 Sco 16 56 48.46 -39 05 39.12 13.74 HIC
V914 Sco 16 56 48.58 -39 05 38.04 13.75 GCVS
PPM 748168 16 56 48.50 -39 05 38.04 13.75 PPM
HIP 82926 16 56 48.53 -39 05 37.32 13.76 HIPPARCOS
21 NVSS J165821-392618 16 58 21.89 -39 26 18.96 14.18 NVSS

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