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 J1635.3+4257

Field

Detected Excesses
Swift-XRT image of the field for 3FGL J1635.3+4257 Swift-XRT detections in the field for 3FGL J1635.3+4257

Detected Excesses (SNR(Sosta) > 3.0)

# R.A. (J2000) Dec. (J2000) Pos. Error (") Rate (cts/s) Counts SNR (Detect) SNR (Sosta)
1 16 35 49.80 +43 00 19.85 5.82 (5.8 ± 1.4) x 10-3 24 4.204 4.046
2 16 35 42.72 +43 03 45.77 6.21 (4.9 ± 1.2) x 10-3 18 3.889 3.975

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 16 34 45.73 +43 01 29.52 6.65 (2.0 ± 0.9) x 10-3 7 2.324 2.192

X-Ray and Gamma Ray Catalogs

More Catalogs
Swift-XRT image with known X-ray and gamma ray sources for 3FGL J1635.3+4257 Swift-XRT image with known radio, optical and UV sources for 3FGL J1635.3+4257

Known X-Ray and Gamma Ray Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Observatory/Database Table
1 2RXS J163550.9+430007 16 35 50.90 +43 00 07.20 5.42 ROSAT
2RXS J163550.9+430007 16 35 50.90 +43 00 07.20 5.42 ROSAT
2 2RXS J163523.6+425035 16 35 23.62 +42 50 35.52 7.28 ROSAT
2RXS J163523.6+425035 16 35 23.62 +42 50 35.52 7.28 ROSAT
3 2RXS J163514.3+430627 16 35 14.30 +43 06 27.72 8.77 ROSAT
2RXS J163514.3+430627 16 35 14.30 +43 06 27.72 8.77 ROSAT
1RXS J163512.9+430625 16 35 12.91 +43 06 24.84 8.78 ROSAT
4 1RXS J163538.7+424746 16 35 38.71 +42 47 46.68 10.45 ROSAT
2RXS J163538.5+424745 16 35 38.57 +42 47 45.96 10.45 ROSAT
2RXS J163538.5+424745 16 35 38.57 +42 47 45.96 10.45 ROSAT

Known Radio, Optical and UV Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Database Table
FIRST J163534.4+430144 16 35 34.49 +43 01 44.04 4.32 FIRST
QORG J163534.5+430145 16 35 34.49 +43 01 45.12 4.33 QORGCAT
PGC 2211419 16 35 34.49 +43 01 45.84 4.35 PGC2003
1 NVSS J163534+430148 16 35 34.49 +43 01 48.00 4.38 NVSS
FIRST J163558.8+425604 16 35 58.80 +42 56 04.92 6.63 FIRST
2 NVSS J163559+425611 16 35 59.11 +42 56 11.04 6.64 NVSS
3 FIRST J163542.4+425133 16 35 42.50 +42 51 33.84 7.16 FIRST
QORG J163542.4+425133 16 35 42.41 +42 51 33.12 7.17 QORGCAT
GB6 J1634+4253 16 34 49.90 +42 53 39.12 7.53 GB6
4 PGC 2211987 16 35 52.30 +43 03 20.88 7.54 PGC2003
FIRST J163449.6+425329 16 34 49.61 +42 53 30.12 7.66 FIRST
5 NVSS J163449+425330 16 34 49.61 +42 53 30.12 7.66 NVSS
WN 1633.2+4259 16 34 49.80 +42 53 26.16 7.67 WENSS
TGSSADR J163449.2+425326 16 34 49.30 +42 53 26.88 7.74 GMRTAS150M
6 NVSS J163606+430141 16 36 06.60 +43 01 41.16 8.69 NVSS
FIRST J163606.8+430140 16 36 06.79 +43 01 41.16 8.72 FIRST
7 FIRST J163525.9+424901 16 35 25.99 +42 49 00.84 8.86 FIRST
8 ZW 1633+4256 16 35 00.00 +42 49 55.20 9.08 ZWCLUSTERS
9 FIRST J163434.3+425914 16 34 34.39 +42 59 13.92 9.17 FIRST
10 PGC 2209821 16 36 15.31 +42 57 27.00 9.40 PGC2003
11 NVSS J163443+430426 16 34 43.61 +43 04 26.04 9.88 NVSS
QORG J163443.2+430427 16 34 43.20 +43 04 27.12 9.94 QORGCAT
FIRST J163443.3+430429 16 34 43.30 +43 04 30.00 9.95 FIRST
TGSSADR J163507.1+424821 16 35 07.10 +42 48 20.88 10.01 GMRTAS150M
12 NVSS J163543+424831 16 35 43.70 +42 48 32.04 10.02 NVSS
FIRST J163507.1+424819 16 35 07.10 +42 48 19.08 10.03 FIRST
FIRST J163543.8+424828 16 35 43.90 +42 48 29.16 10.07 FIRST
WN 1633.5+4254 16 35 08.69 +42 48 06.12 10.17 WENSS
7C 163333.3+425407 16 35 09.41 +42 48 01.08 10.20 UC7C151MHZ
PGC 2206450 16 35 08.69 +42 47 60.00 10.26 PGC2003
FIRST J163508.5+424800 16 35 08.59 +42 47 60.00 10.26 FIRST
QORG J163508.5+424800 16 35 08.50 +42 47 60.00 10.27 QORGCAT
13 NVSS J163508+424759 16 35 08.59 +42 47 58.92 10.28 NVSS
14 PGC 2206670 16 34 58.61 +42 48 33.12 10.41 PGC2003
FIRST J163510.1+424742 16 35 10.20 +42 47 42.00 10.47 FIRST
FIRST J163509.3+424744 16 35 09.41 +42 47 44.16 10.48 FIRST
FIRST J163538.5+424733 16 35 38.50 +42 47 34.08 10.65 FIRST
15 NVSS J163538+424732 16 35 38.40 +42 47 33.00 10.66 NVSS
FIRST J163528.5+430913 16 35 28.61 +43 09 14.04 11.39 FIRST
16 NVSS J163528+430920 16 35 28.39 +43 09 20.16 11.49 NVSS
FIRST J163528.4+430923 16 35 28.39 +43 09 24.12 11.56 FIRST
17 V850 Her 16 35 11.21 +42 46 26.40 11.67 GCVS
WN 1633.4+4315 16 35 04.80 +43 09 09.00 11.81 WENSS
TGSSADR J163504.5+430910 16 35 04.49 +43 09 11.16 11.85 GMRTAS150M
18 NVSS J163504+430912 16 35 04.70 +43 09 11.88 11.87 NVSS
QORG J163504.6+430914 16 35 04.61 +43 09 14.04 11.90 QORGCAT
FIRST J163504.5+430914 16 35 04.61 +43 09 15.12 11.92 FIRST
19 PGC 2208895 16 36 28.01 +42 55 01.92 12.06 PGC2003
FIRST J163545.5+430930 16 35 45.50 +43 09 29.88 12.29 FIRST
20 NVSS J163545+430929 16 35 45.79 +43 09 29.88 12.29 NVSS
WN 1634.1+4315 16 35 46.20 +43 09 28.08 12.29 WENSS
QORG J163545.6+430931 16 35 45.60 +43 09 30.96 12.30 QORGCAT
21 PGC 2206117 16 34 45.91 +42 47 03.84 12.86 PGC2003
22 FIRST J163446.6+424627 16 34 46.61 +42 46 27.12 13.30 FIRST
QORG J163446.6+424627 16 34 46.61 +42 46 27.12 13.31 QORGCAT
23 NVSS J163619+430847 16 36 19.39 +43 08 48.12 14.90 NVSS
FIRST J163619.4+430847 16 36 19.39 +43 08 48.12 14.91 FIRST
WN 1634.7+4314 16 36 21.10 +43 08 36.96 14.98 WENSS

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