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 J0251.1-1829

Field

Detected Excesses
Swift-XRT image of the field for 3FGL J0251.1-1829 Swift-XRT detections in the field for 3FGL J0251.1-1829

Detected Excesses (SNR(Sosta) > 3.0)

# R.A. (J2000) Dec. (J2000) Pos. Error (") Rate (cts/s) Counts SNR (Detect) SNR (Sosta)
1 02 51 11.39 -18 31 15.15 4.14 (1.7 ± 0.2) x 10-2 121 10.230 10.130

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 59.80 -18 18 42.40 6.52 (1.5 ± 0.5) x 10-3 10 2.750 2.708
2 02 51 31.44 -18 22 03.55 7.48 (1.2 ± 0.5) x 10-3 10 2.363 2.560
3 02 50 56.41 -18 20 07.74 6.65 (1.1 ± 0.5) x 10-3 10 2.271 2.289

X-Ray and Gamma Ray Catalogs

More Catalogs
Swift-XRT image with known X-ray and gamma ray sources for 3FGL J0251.1-1829 Swift-XRT image with known radio, optical and UV sources for 3FGL J0251.1-1829

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 10.54 ROSAT
2RXS J025100.2-181855 02 51 00.29 -18 18 55.80 10.54 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 2.06 NVSS
TGSSADR J025111.4-183114 02 51 11.50 -18 31 14.16 2.10 GMRTAS150M
2 WISH B0248.8-1844 02 51 11.40 -18 32 13.92 3.10 WISH
PMN J0251-1834 02 51 21.70 -18 34 37.92 6.02 PMN
VLSSr J025123.6-183424 02 51 23.71 -18 34 23.88 6.02 VLSSR
3 NVSS J025123-183443 02 51 23.71 -18 34 42.96 6.30 NVSS
GLEAM J025123-183443 02 51 23.59 -18 34 44.04 6.31 GLEAMEGCAT
TGSSADR J025123.6-183445 02 51 23.59 -18 34 45.84 6.33 GMRTAS150M
WISH B0249.0-1847 02 51 23.71 -18 34 45.12 6.33 WISH
TGSSADR J025139.5-182817 02 51 39.50 -18 28 17.04 6.75 GMRTAS150M
WISH B0249.3-1840 02 51 39.50 -18 28 14.88 6.75 WISH
4 NVSS J025139-182813 02 51 39.60 -18 28 14.16 6.77 NVSS
GLEAM J025139-182808 02 51 39.79 -18 28 09.12 6.84 GLEAMEGCAT
5 PMN J0250-1820 02 50 56.81 -18 20 48.12 9.02 PMN

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