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 J1637.5+3005

Field

Detected Excesses
Swift-XRT image of the field for 4FGL J1637.5+3005 Swift-XRT detections in the field for 4FGL J1637.5+3005

Detected Excesses (SNR(Sosta) > 3.0)

# R.A. (J2000) Dec. (J2000) Pos. Error (") Rate (cts/s) Counts SNR (Detect) SNR (Sosta)
1 16 37 39.28 +30 10 12.16 4.09 (1.37 ± 0.14) x 10-2 120 10.330 9.885
2 16 37 38.45 +30 05 09.67 4.59 (6.1 ± 1.0) x 10-3 59 6.437 6.188
3 16 37 28.50 +30 09 54.55 5.05 (3.3 ± 0.7) x 10-3 32 4.493 4.496
4 16 36 47.17 +30 05 55.61 5.08 (2.6 ± 0.7) x 10-3 28 4.327 4.007
5 16 37 36.04 +30 13 11.99 5.14 (2.6 ± 0.7) x 10-3 31 4.525 3.895
6 16 37 13.87 +30 10 22.49 4.90 (2.3 ± 0.7) x 10-3 27 3.966 3.471

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 37 12.81 +30 09 17.45 5.11 (1.8 ± 0.7) x 10-3 20 2.991 2.832
2 16 37 31.03 +30 12 45.31 5.20 (1.8 ± 0.7) x 10-3 20 2.752 2.696
3 16 36 49.12 +30 15 10.15 6.31 (1.5 ± 0.6) x 10-3 9 2.481 2.638
4 16 37 08.86 +29 59 27.48 5.89 (1.0 ± 0.4) x 10-3 12 2.575 2.361
5 16 37 23.77 +30 09 06.18 5.02 (1.3 ± 0.6) x 10-3 20 2.734 2.312
6 16 37 44.72 +30 05 55.61 5.53 (1.2 ± 0.5) x 10-3 22 2.802 2.203
7 16 37 17.70 +30 09 41.43 4.78 (1.0 ± 0.5) x 10-3 23 2.907 1.936

X-Ray and Gamma Ray Catalogs

More Catalogs
Swift-XRT image with known X-ray and gamma ray sources for 4FGL J1637.5+3005 Swift-XRT image with known radio, optical and UV sources for 4FGL J1637.5+3005

Known X-Ray and Gamma Ray Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Observatory/Database Table
1 2CXO J163748.6+300332 16 37 48.67 +30 03 32.40 3.43 CHANDRA
2 2RXS J163728.3+300942 16 37 28.37 +30 09 42.84 4.69 ROSAT
2RXS J163728.3+300942 16 37 28.37 +30 09 42.84 4.69 ROSAT
3 2CXO J163742.0+300042 16 37 42.02 +30 00 42.48 4.79 CHANDRA
4 2CXO J163722.0+295936 16 37 22.01 +29 59 36.24 6.29 CHANDRA
SACSTP J163722.1+295930 16 37 22.01 +29 59 32.64 6.35 SWIFT
SACSSP J163722.2+295928 16 37 22.06 +29 59 30.84 6.37 SWIFT
5 2RXS J163713.1+301023 16 37 13.18 +30 10 23.88 6.97 ROSAT
2RXS J163713.1+301023 16 37 13.18 +30 10 23.88 6.97 ROSAT
6 2CXO J163729.6+295750 16 37 29.64 +29 57 50.76 7.49 CHANDRA
SACSSP J163729.7+295746 16 37 29.62 +29 57 49.32 7.51 SWIFT
SACSTP J163729.7+295744 16 37 29.62 +29 57 47.16 7.55 SWIFT
SACSHP J163729.5+295741 16 37 29.35 +29 57 43.56 7.61 SWIFT
7 2CXO J163752.0+295825 16 37 52.10 +29 58 25.32 7.77 CHANDRA
SACSTP J163752.3+295817 16 37 52.18 +29 58 20.64 7.85 SWIFT
8 2CXO J163709.1+295924 16 37 09.12 +29 59 24.00 8.08 CHANDRA
SWCL J163741.6+295700 16 37 41.52 +29 57 02.88 8.32 SWIFT
9 2CXO J163742.5+295700 16 37 42.50 +29 57 00.36 8.40 CHANDRA
10 SACSSP J163720.4+295645 16 37 20.30 +29 56 48.12 9.01 SWIFT
11 2CXO J163745.3+295609 16 37 45.36 +29 56 09.96 9.36 CHANDRA
12 SACSHP J163746.5+295535 16 37 46.39 +29 55 38.64 9.92 SWIFT
SACSTP J163746.4+295533 16 37 46.32 +29 55 36.12 9.95 SWIFT
SACSSP J163746.4+295531 16 37 46.30 +29 55 33.96 9.99 SWIFT
13 SACSSP J163722.5+295337 16 37 22.39 +29 53 40.20 11.89 SWIFT
SACSTP J163722.6+295335 16 37 22.51 +29 53 38.04 11.92 SWIFT
14 2CXO J163646.0+295942 16 36 46.06 +29 59 43.08 11.93 CHANDRA
15 2CXO J163652.1+295713 16 36 52.15 +29 57 13.68 12.24 CHANDRA
16 2CXO J163811.6+295418 16 38 11.71 +29 54 18.00 13.54 CHANDRA

Known Radio, Optical and UV Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Database Table
VLSSr J163737.9+300507 16 37 37.90 +30 05 08.16 0.66 VLSSR
QORG J163738.2+300507 16 37 38.21 +30 05 07.08 0.73 QORGCAT
FIRST J163738.2+300507 16 37 38.30 +30 05 07.08 0.75 FIRST
1 NVSS J163738+300507 16 37 38.30 +30 05 08.16 0.75 NVSS
TGSSADR J163738.3+300508 16 37 38.40 +30 05 08.88 0.76 GMRTAS150M
WN 1635.6+3011 16 37 38.40 +30 05 13.92 0.76 WENSS
1635+3010 16 37 38.59 +30 05 02.04 0.84 NORTH6CM
GB6 J1637+3005 16 37 38.81 +30 05 08.16 0.85 GB6
2 FIRST J163743.8+300349 16 37 43.80 +30 03 50.04 2.40 FIRST
WN 1635.8+3010 16 37 47.71 +30 04 48.00 2.80 WENSS
FIRST J163747.5+300436 16 37 47.50 +30 04 36.84 2.81 FIRST
TGSSADR J163747.5+300437 16 37 47.59 +30 04 37.92 2.81 GMRTAS150M
3 NVSS J163747+300435 16 37 47.71 +30 04 36.12 2.84 NVSS
4 FIRST J163739.2+301012 16 37 39.19 +30 10 12.00 5.05 FIRST
QORG J163739.1+301013 16 37 39.10 +30 10 13.08 5.06 QORGCAT
5 BD+30 2851 16 37 50.59 +30 00 41.76 5.68 ACRS
PPM 79499 16 37 50.64 +30 00 41.40 5.69 PPM
SAO 65440 16 37 50.71 +30 00 39.96 5.72 SAO
6 FIRST J163711.4+300121 16 37 11.50 +30 01 21.00 6.39 FIRST
FIRST J163709.2+300118 16 37 09.31 +30 01 18.12 6.80 FIRST
QORG J163708.9+300115 16 37 08.90 +30 01 14.88 6.90 QORGCAT
7 FIRST J163711.4+300029 16 37 11.50 +30 00 29.88 6.95 FIRST
8 NVSS J163708+300110 16 37 08.81 +30 01 10.92 6.95 NVSS
9 FIRST J163746.6+295819 16 37 46.70 +29 58 19.92 7.37 FIRST
FIRST J163704.2+301136 16 37 04.30 +30 11 35.88 9.18 FIRST
FIRST J163703.9+301146 16 37 04.01 +30 11 47.04 9.35 FIRST
10 NVSS J163703+301145 16 37 03.79 +30 11 44.88 9.35 NVSS
FIRST J163746.3+295539 16 37 46.30 +29 55 39.00 9.91 FIRST
QORG J163746.3+295537 16 37 46.30 +29 55 36.84 9.94 QORGCAT
11 SDSS J16371+2956 16 37 08.81 +29 56 58.92 10.01 VERONCAT
12 NVSS J163746+295525 16 37 46.30 +29 55 24.96 10.13 NVSS
FIRST J163824.7+300201 16 38 24.79 +30 02 00.96 11.26 FIRST
13 NVSS J163824+300201 16 38 24.79 +30 02 02.04 11.26 NVSS
14 B2 1634+30 16 36 46.70 +30 01 00.12 11.26 DIXON
15 PGC 1887613 16 36 44.30 +30 02 07.08 11.39 PGC2003
FIRST J163646.7+295956 16 36 46.70 +29 59 57.12 11.70 FIRST
7C 163448.4+300548 16 36 46.10 +29 59 48.12 11.88 UC7C151MHZ
TGSSADR J163646.1+295944 16 36 46.10 +29 59 44.88 11.90 GMRTAS150M
WN 1634.8+3005 16 36 46.10 +29 59 44.16 11.91 WENSS
16 NVSS J163645+295944 16 36 45.91 +29 59 44.16 11.94 NVSS
17 WDS J16385+3006 16 38 30.00 +30 06 00.00 11.94 WDS
VLSSr J163645.8+295943 16 36 45.79 +29 59 43.08 11.97 VLSSR
18 PGC 1885164 16 38 20.21 +29 58 21.00 11.99 PGC2003
19 GLEAM J163646+295912 16 36 46.61 +29 59 12.84 12.06 GLEAMEGCAT
FIRST J163645.3+295932 16 36 45.41 +29 59 31.92 12.14 FIRST
20 TXS 1634+300 16 36 41.81 +29 58 45.84 13.19 TEXAS
21 NVSS J163823+301531 16 38 23.21 +30 15 30.96 14.66 NVSS
FIRST J163823.6+301531 16 38 23.59 +30 15 32.04 14.72 FIRST

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