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.

2FGL J0251.0+2557

Field

Detected Excesses
Swift-XRT image of the field for 2FGL J0251.0+2557 Swift-XRT detections in the field for 2FGL J0251.0+2557


No detected excesses found.

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 51 36.83 +26 01 46.12 6.93 (2.0 ± 0.8) x 10-3 10 2.367 2.328
2 02 51 11.46 +25 53 36.74 8.27 (2.1 ± 0.9) x 10-3 7 2.277 2.315

X-Ray and Gamma Ray Catalogs

More Catalogs
Swift-XRT image with known X-ray and gamma ray sources for 2FGL J0251.0+2557 Swift-XRT image with known radio, optical and UV sources for 2FGL J0251.0+2557

Known X-Ray and Gamma Ray Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Observatory/Database Table
1 2RXS J025013.5+254653 02 50 13.54 +25 46 53.76 15.65 ROSAT
2RXS J025013.5+254653 02 50 13.54 +25 46 53.76 15.65 ROSAT

Known Radio, Optical and UV Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Database Table
TGSSADR J025034.9+260032 02 50 34.99 +26 00 33.12 6.75 GMRTAS150M
1 NVSS J025034+260032 02 50 34.80 +26 00 32.04 6.80 NVSS
2 PSR J0251+26 02 51 07.99 +26 04 59.88 7.14 ATNFPULSAR
3 NVSS J025024+255956 02 50 24.79 +25 59 57.12 8.75 NVSS
4 OD+281 02 50 22.61 +26 00 21.96 9.35 DIXON
GLEAM J025053+260955 02 50 53.59 +26 09 56.16 12.15 GLEAMEGCAT
5 NVSS J025028+260805 02 50 28.01 +26 08 04.92 12.79 NVSS
TGSSADR J025027.9+260805 02 50 27.91 +26 08 04.92 12.80 GMRTAS150M
6 NVSS J025152+254558 02 51 52.30 +25 45 59.04 16.36 NVSS

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