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 J1258.4+2123

Field

Detected Excesses
Swift-XRT image of the field for 3FGL J1258.4+2123 Swift-XRT detections in the field for 3FGL J1258.4+2123

Detected Excesses (SNR(Sosta) > 3.0)

# R.A. (J2000) Dec. (J2000) Pos. Error (") Rate (cts/s) Counts SNR (Detect) SNR (Sosta)
1 12 58 21.49 +21 23 51.73 4.47 (1.9 ± 0.2) x 10-2 74 7.794 7.816
2 12 58 04.60 +21 25 23.23 6.41 (3.3 ± 1.1) x 10-3 15 3.087 3.108

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 12 58 49.26 +21 18 02.80 6.12 (2.7 ± 1.0) x 10-3 17 2.821 2.810
2 12 57 45.33 +21 22 11.24 6.78 (2.3 ± 0.9) x 10-3 12 2.642 2.661
3 12 57 40.21 +21 30 30.83 5.89 (1.7 ± 0.9) x 10-3 9 2.319 1.921

X-Ray and Gamma Ray Catalogs

More Catalogs
Swift-XRT image with known X-ray and gamma ray sources for 3FGL J1258.4+2123 Swift-XRT image with known radio, optical and UV sources for 3FGL J1258.4+2123

Known X-Ray and Gamma Ray Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Observatory/Database Table
1 1RXS J125820.4+212700 12 58 20.40 +21 27 00.36 4.27 ROSAT
2 [GR2015] Com 135 12 58 59.30 +21 12 51.84 12.56 ROSAT
1RXS J125859.8+211256 12 58 59.81 +21 12 56.16 12.57 ROSAT
2RXS J125859.7+211254 12 58 59.78 +21 12 54.00 12.60 ROSAT
2RXS J125859.7+211254 12 58 59.78 +21 12 54.00 12.60 ROSAT

Known Radio, Optical and UV Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Database Table
1 FIRST J125832.5+212216 12 58 32.59 +21 22 17.04 1.31 FIRST
FIRST J125821.7+212359 12 58 21.70 +21 23 58.92 1.76 FIRST
FIRST J125821.4+212351 12 58 21.41 +21 23 51.00 1.76 FIRST
2 NVSS J125821+212352 12 58 21.41 +21 23 52.08 1.77 NVSS
GB6 J1258+2123 12 58 21.19 +21 23 51.00 1.81 GB6
3 4C+21.37 12 58 33.79 +21 21 30.96 2.08 DIXON
1256+2135 12 58 34.61 +21 19 15.96 4.15 NORTH6CM
1256+2135 12 58 34.61 +21 19 15.96 4.15 NORTH20CM
GB6 J1258+2119 12 58 34.51 +21 19 10.92 4.22 GB6
FIRST J125833.9+211907 12 58 33.91 +21 19 06.96 4.24 FIRST
4 NVSS J125834+211907 12 58 34.70 +21 19 08.04 4.29 NVSS
TGSSADR J125834.7+211907 12 58 34.70 +21 19 06.96 4.30 GMRTAS150M
TXS 1256+215 12 58 34.70 +21 19 06.96 4.30 TEXAS
VLSSr J125834.7+211906 12 58 34.70 +21 19 06.96 4.31 VLSSR
WE 1256+21W1 12 58 34.80 +21 19 06.96 4.31 DIXON
5 MITG J1258+2119 12 58 37.61 +21 19 24.96 4.31 MITGB6CM
GLEAM J125834+211904 12 58 34.99 +21 19 04.08 4.37 GLEAMEGCAT
7C 125607.7+213515 12 58 34.99 +21 19 04.08 4.37 LD7C151MHZ
FIRST J125835.5+211907 12 58 35.50 +21 19 06.96 4.37 FIRST
6 FIRST J125817.9+211918 12 58 18.00 +21 19 18.12 4.55 FIRST
FIRST J125839.0+211904 12 58 39.10 +21 19 05.16 4.78 FIRST
7 PKS J1258+2118 12 58 37.20 +21 18 42.84 4.89 PKSCAT90
PKS1256+21 12 58 37.30 +21 18 42.84 4.90 DIXON
8 FIRST J125842.3+211902 12 58 42.29 +21 19 03.00 5.24 FIRST
9 FIRST J125812.6+211923 12 58 12.60 +21 19 23.16 5.27 FIRST
FIRST J125811.2+211923 12 58 11.21 +21 19 23.16 5.49 FIRST
10 FIRST J125810.1+211924 12 58 10.10 +21 19 23.88 5.68 FIRST
11 FIRST J125836.6+211720 12 58 36.70 +21 17 21.12 6.13 FIRST
FIRST J125848.1+211804 12 58 48.10 +21 18 03.96 6.86 FIRST
12 NVSS J125848+211803 12 58 48.79 +21 18 02.88 6.97 NVSS
13 FIRST J125808.8+212832 12 58 08.81 +21 28 32.16 7.05 FIRST
14 FIRST J125838.7+211609 12 58 38.81 +21 16 09.12 7.41 FIRST
15 FIRST J125903.5+212324 12 59 03.60 +21 23 24.00 8.20 FIRST
16 FIRST J125748.9+211939 12 57 48.89 +21 19 39.00 9.83 FIRST
FIRST J125758.7+213054 12 57 58.70 +21 30 55.08 10.39 FIRST
17 NVSS J125758+213058 12 57 58.90 +21 30 57.96 10.40 NVSS
18 FIRST J125854.8+213225 12 58 54.91 +21 32 26.16 11.13 FIRST

Penn State University Goddard Space Flight Center Swift