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 J1656.9-3919c

Field

Detected Excesses
Swift-XRT image of the field for 3FGL J1656.9-3919c Swift-XRT detections in the field for 3FGL J1656.9-3919c

Detected Excesses (SNR(Sosta) > 3.0)

# R.A. (J2000) Dec. (J2000) Pos. Error (") Rate (cts/s) Counts SNR (Detect) SNR (Sosta)
1 16 56 42.99 -39 08 10.85 4.03 (7.3 ± 0.7) x 10-2 127 11.510 10.310
2 16 56 49.14 -39 05 33.53 4.44 (5.2 ± 0.7) x 10-2 67 8.355 7.493

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 57 50.11 -39 06 52.49 6.65 (3.4 ± 1.4) x 10-3 14 2.828 2.428

X-Ray and Gamma Ray Catalogs

More Catalogs
Swift-XRT image with known X-ray and gamma ray sources for 3FGL J1656.9-3919c Swift-XRT image with known radio, optical and UV sources for 3FGL J1656.9-3919c

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 10.66 ROSAT
2 1RXS J165633.9-390843 16 56 33.91 -39 08 43.08 11.94 ROSAT

Known Radio, Optical and UV Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Database Table
1 PGCC G345.83+2.35 16 57 10.51 -39 15 10.08 5.02 PLANCKGCC
MGPS J165640-391526 16 56 40.20 -39 15 25.92 5.53 MGPS2
2 NVSS J165640-391526 16 56 40.10 -39 15 25.92 5.55 NVSS
3 GPA 345.65+2.34 16 56 37.90 -39 23 44.16 5.75 GPA
4 PGCC G345.71+2.24 16 57 12.91 -39 24 47.88 5.84 PLANCKGCC
5 HD 322376 16 57 13.06 -39 25 19.56 6.32 HDEC
6 PPM 748159 16 56 24.29 -39 18 05.40 6.85 PPM
CD-3910896 16 56 24.24 -39 18 05.40 6.86 ACRS
7 NVSS J165734-392000 16 57 34.20 -39 20 00.96 6.86 NVSS
8 NVSS J165640-391226 16 56 40.80 -39 12 25.92 8.00 NVSS
9 HD 322375 16 56 15.84 -39 21 15.12 8.46 HDEC
10 HD 322374 16 56 13.56 -39 18 07.20 8.88 HDEC
MGPS J165717-392803 16 57 17.50 -39 28 04.08 9.16 MGPS2
11 NVSS J165716-392811 16 57 16.99 -39 28 12.00 9.25 NVSS
12 HD 322370 16 56 09.46 -39 14 52.80 10.67 HDEC
13 HD 322377 16 57 30.31 -39 29 27.60 11.55 HDEC
14 CD-3811340 16 56 42.60 -39 08 14.28 11.83 ACRS
PPM 295695 16 56 42.67 -39 08 13.20 11.84 PPM
SAO 208217 16 56 42.60 -39 08 12.84 11.85 SAO
15 HD 322373 16 56 02.50 -39 24 52.92 12.07 HDEC
WDS J16567-3908 16 56 42.00 -39 07 59.88 12.09 WDS
16 HD 322372 16 55 58.44 -39 24 51.12 12.77 HDEC
17 SCO 16 57 51.53 -39 09 25.92 14.44 WOODEBCAT

Penn State University Goddard Space Flight Center Swift