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 J2024.8-2331

Field

Detected Excesses
Swift-XRT image of the field for 3FGL J2024.8-2331 Swift-XRT detections in the field for 3FGL J2024.8-2331

Detected Excesses (SNR(Sosta) > 3.0)

# R.A. (J2000) Dec. (J2000) Pos. Error (") Rate (cts/s) Counts SNR (Detect) SNR (Sosta)
1 20 24 19.53 -23 28 31.49 4.48 (2.3 ± 0.3) x 10-2 69 7.892 7.825
2 20 24 51.58 -23 29 42.01 5.82 (6 ± 2) x 10-3 21 3.372 3.595
3 20 25 22.05 -23 33 06.28 6.52 (4.3 ± 1.3) x 10-3 14 3.359 3.309

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 20 24 38.30 -23 20 18.33 7.27 (2.9 ± 1.2) x 10-3 10 2.486 2.515
2 20 25 04.00 -23 30 40.26 6.52 (2.4 ± 1.1) x 10-3 15 2.339 2.283

X-Ray and Gamma Ray Catalogs

More Catalogs
Swift-XRT image with known X-ray and gamma ray sources for 3FGL J2024.8-2331 Swift-XRT image with known radio, optical and UV sources for 3FGL J2024.8-2331

Known X-Ray and Gamma Ray Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Observatory/Database Table
1 1RXS J202505.0-233245 20 25 04.99 -23 32 44.88 3.53 ROSAT
2 6dFGS J2024227-232903 20 24 22.68 -23 29 03.12 6.86 ROSAT
1RXS J202422.0-232847 20 24 22.01 -23 28 47.64 7.10 ROSAT
1RXS J202422.0-232847 20 24 22.01 -23 28 46.92 7.11 ROSAT
2RXS J202421.8-232843 20 24 21.84 -23 28 42.96 7.17 ROSAT
2RXS J202421.8-232843 20 24 21.84 -23 28 42.96 7.17 ROSAT
3 HD 194063 20 24 19.58 -23 28 32.88 7.71 ROSAT

Known Radio, Optical and UV Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Database Table
1 NVSS J202501-232936 20 25 01.10 -23 29 36.96 3.22 NVSS
2 NVSS J202442-232826 20 24 42.31 -23 28 26.04 3.72 NVSS
3 NVSS J202502-232314 20 25 02.90 -23 23 15.00 8.92 NVSS
4 NVSS J202408-232741 20 24 08.21 -23 27 41.04 10.44 NVSS
WISH B2021.1-2337 20 24 07.70 -23 27 50.04 10.49 WISH
5 NVSS J202457-231941 20 24 57.60 -23 19 41.16 12.11 NVSS

Penn State University Goddard Space Flight Center Swift