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 J0251.1-1830

Field

Detected Excesses

Swift-XRT image of the field for 4FGL J0251.1-1830 Swift-XRT detections in the field for 4FGL J0251.1-1830

Detected Excesses (SNR(Sosta) > 3.0)

# R.A. (J2000) Dec. (J2000) Pos. Error (") Rate (cts/s) Counts SNR (Detect) SNR (Sosta)
1 02 51 11.37 -18 31 14.26 4.17 (1.9 ± 0.2) x 10-2 117 10.010 10.040

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 02 50 59.86 -18 18 43.01 7.09 (1.6 ± 0.6) x 10-3 9 2.712 2.681
2 02 51 31.45 -18 22 03.03 7.71 (1.3 ± 0.5) x 10-3 10 2.435 2.609
3 02 50 56.37 -18 20 07.85 7.27 (1.4 ± 0.6) x 10-3 9 2.320 2.533

X-Ray and Gamma Ray Catalogs

More Catalogs

Swift-XRT image with known X-ray and gamma ray sources for 4FGL J0251.1-1830 Swift-XRT image with known radio, optical and UV sources for 4FGL J0251.1-1830

Known X-Ray and Gamma Ray Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Observatory/Database Table
1 2RXS J025100.2-181855 02 51 00.29 -18 18 55.80 11.77 ROSAT
2RXS J025100.2-181855 02 51 00.29 -18 18 55.80 11.77 ROSAT

Known Radio, Optical and UV Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Database Table
1 NVSS J025111-183112 02 51 11.40 -18 31 12.00 1.03 NVSS
QORG J025111.5-183112 02 51 11.50 -18 31 12.00 1.04 QORGCAT
TGSSADR J025111.4-183114 02 51 11.50 -18 31 14.16 1.06 GMRTAS150M
2 WISH B0248.8-1844 02 51 11.40 -18 32 13.92 1.86 WISH
3 PGC 866630 02 50 59.40 -18 33 38.16 3.70 PGC2003
PMN J0251-1834 02 51 21.70 -18 34 37.92 5.21 PMN
VLSSr J025123.6-183424 02 51 23.71 -18 34 23.88 5.34 VLSSR
QORG J025123.7-183442 02 51 23.71 -18 34 41.88 5.56 QORGCAT
4 NVSS J025123-183443 02 51 23.71 -18 34 42.96 5.57 NVSS
GLEAM J025123-183443 02 51 23.59 -18 34 44.04 5.58 GLEAMEGCAT
TGSSADR J025123.6-183445 02 51 23.59 -18 34 45.84 5.60 GMRTAS150M
WISH B0249.0-1847 02 51 23.71 -18 34 45.12 5.60 WISH
TGSSADR J025139.5-182817 02 51 39.50 -18 28 17.04 7.81 GMRTAS150M
WISH B0249.3-1840 02 51 39.50 -18 28 14.88 7.82 WISH
5 NVSS J025139-182813 02 51 39.60 -18 28 14.16 7.84 NVSS
GLEAM J025139-182808 02 51 39.79 -18 28 09.12 7.92 GLEAMEGCAT
6 PPM 212069 02 50 31.08 -18 30 05.40 8.78 PPM
7 PMN J0250-1820 02 50 56.81 -18 20 48.12 10.12 PMN
8 PPM 212100 02 51 58.25 -18 40 29.28 15.50 PPM

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