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 J0656.5+4218

Field

Detected Excesses
Swift-XRT image of the field for 4FGL J0656.5+4218 Swift-XRT detections in the field for 4FGL J0656.5+4218

Detected Excesses (SNR(Sosta) > 3.0)

# R.A. (J2000) Dec. (J2000) Pos. Error (") Rate (cts/s) Counts SNR (Detect) SNR (Sosta)
1 06 56 35.45 +42 15 24.11 3.64 (9.0 ± 0.4) x 10-2 631 23.410 23.990
2 06 55 51.51 +42 21 53.09 6.78 (1.9 ± 0.6) x 10-3 14 3.287 3.310

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 06 57 09.58 +42 14 32.77 6.65 (1.4 ± 0.5) x 10-3 12 2.760 2.799
2 06 55 41.14 +42 21 11.86 7.09 (1.2 ± 0.5) x 10-3 9 2.501 2.515
3 06 56 24.13 +42 28 01.22 5.70 (1.2 ± 0.5) x 10-3 16 2.547 2.376
4 06 56 58.21 +42 07 59.99 5.76 (10 ± 5) x 10-4 11 2.485 1.886

X-Ray and Gamma Ray Catalogs

More Catalogs
Swift-XRT image with known X-ray and gamma ray sources for 4FGL J0656.5+4218 Swift-XRT image with known radio, optical and UV sources for 4FGL J0656.5+4218

Known X-Ray and Gamma Ray Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Observatory/Database Table
1 2RXS J065635.1+421511 06 56 35.14 +42 15 11.88 3.64 ROSAT
2RXS J065635.1+421511 06 56 35.14 +42 15 11.88 3.64 ROSAT
1RXS J065635.0+421511 06 56 34.99 +42 15 11.52 3.64 ROSAT
1RXS J065635.0+421511 06 56 34.99 +42 15 11.16 3.65 ROSAT

Known Radio, Optical and UV Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Database Table
1 PGC 2197104 06 56 44.30 +42 20 56.04 2.68 PGC2003
QORG J065635.6+421522 06 56 35.59 +42 15 21.96 3.47 QORGCAT
2 NVSS J065635+421520 06 56 35.81 +42 15 20.16 3.50 NVSS
QORG J065635.0+421507 06 56 34.99 +42 15 06.84 3.72 QORGCAT
3 NVSS J065615+421915 06 56 15.10 +42 19 14.88 3.75 NVSS
4 NVSS J065616+422309 06 56 16.70 +42 23 08.88 5.51 NVSS
5 PGC 2195788 06 55 52.51 +42 16 59.88 8.12 PGC2003
6 NVSS J065616+421101 06 56 16.51 +42 11 00.96 8.55 NVSS
7C 065346.8+422511 06 57 19.70 +42 21 10.08 8.55 UC7C151MHZ
7 NVSS J065719+422112 06 57 19.80 +42 21 12.96 8.57 NVSS
PGC 2197242 06 57 19.61 +42 21 21.96 8.58 PGC2003
WN 0653.7+4225 06 57 19.90 +42 21 11.16 8.58 WENSS
TGSSADR J065720.2+422109 06 57 20.30 +42 21 10.08 8.64 GMRTAS150M
GB6 J0657+4221 06 57 20.71 +42 21 09.00 8.71 GB6
8 0653+4225 06 57 22.20 +42 21 29.16 9.07 NORTH6CM
9 NVSS J065616+422717 06 56 16.30 +42 27 16.92 9.15 NVSS
10 205- 40 06 56 34.18 +42 28 44.76 9.91 NLTT
11 PGC 2199633 06 56 20.21 +42 28 32.88 10.11 PGC2003
12 PGC 2199709 06 56 16.90 +42 28 45.84 10.50 PGC2003
13 PGC 2199694 06 56 11.40 +42 28 44.04 10.84 PGC2003
14 PGC 2197476 06 57 33.79 +42 22 03.00 11.29 PGC2003
15 PGC 2196614 06 55 33.10 +42 19 21.00 11.50 PGC2003
16 PGC 2194419 06 57 34.51 +42 12 41.04 12.57 PGC2003
17 PGC 2198934 06 57 39.60 +42 26 22.92 14.08 PGC2003
18 PGC 2200127 06 57 28.30 +42 30 01.08 14.86 PGC2003
19 PGC 2193215 06 55 35.11 +42 08 40.92 15.07 PGC2003
20 ZW 0654+4213 06 57 38.40 +42 08 56.40 15.31 ZWCLUSTERS
21 PGC 2199958 06 57 37.30 +42 29 29.04 15.64 PGC2003

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