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 J1836.9+4439

Field

Detected Excesses
Swift-XRT image of the field for 4FGL J1836.9+4439 Swift-XRT detections in the field for 4FGL J1836.9+4439

Detected Excesses (SNR(Sosta) > 3.0)

# R.A. (J2000) Dec. (J2000) Pos. Error (") Rate (cts/s) Counts SNR (Detect) SNR (Sosta)
1 18 37 14.21 +44 51 35.76 4.74 (10 ± 2) x 10-3 42 5.945 5.426
2 18 37 03.50 +44 38 09.73 5.35 (7 ± 2) x 10-3 30 4.816 4.837

X-Ray and Gamma Ray Catalogs

More Catalogs
Swift-XRT image with known X-ray and gamma ray sources for 4FGL J1836.9+4439 Swift-XRT image with known radio, optical and UV sources for 4FGL J1836.9+4439

Known X-Ray and Gamma Ray Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Observatory/Database Table
1 2RXS J183656.6+443302 18 36 56.62 +44 33 02.88 6.58 ROSAT
2RXS J183656.6+443302 18 36 56.62 +44 33 02.88 6.58 ROSAT
2 2RXS J183707.3+444636 18 37 07.32 +44 46 36.48 7.20 ROSAT
2RXS J183707.3+444636 18 37 07.32 +44 46 36.48 7.20 ROSAT
3 2RXS J183712.4+445134 18 37 12.43 +44 51 34.92 12.25 ROSAT
2RXS J183712.4+445134 18 37 12.43 +44 51 34.92 12.25 ROSAT
1RXS J183712.3+445136 18 37 12.31 +44 51 36.36 12.28 ROSAT

Known Radio, Optical and UV Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Database Table
1 PPM 57316 18 36 54.94 +44 38 54.96 0.83 PPM
BD+44 2944 18 36 54.98 +44 38 54.60 0.83 ACRS
SAO 47653 18 36 54.67 +44 38 55.68 0.84 SAO
2 NVSS J183651+443926 18 36 51.10 +44 39 25.92 1.13 NVSS
3 PGC 2247058 18 37 05.90 +44 33 52.92 5.94 PGC2003
4 PGC 2246883 18 37 07.10 +44 33 20.88 6.51 PGC2003
5 NVSS J183730+444350 18 37 30.91 +44 43 50.88 7.32 NVSS
6 NVSS J183608+443612 18 36 08.81 +44 36 12.96 9.29 NVSS
7 VLSSr J183608.3+444351 18 36 08.40 +44 43 51.96 9.68 VLSSR
WN 1836.3+4433 18 37 51.50 +44 35 47.04 10.37 WENSS
8 NVSS J183751+443544 18 37 51.91 +44 35 44.16 10.46 NVSS
TGSSADR J183752.0+443543 18 37 52.01 +44 35 44.16 10.48 GMRTAS150M
GB6 J1836+4428 18 36 36.60 +44 28 42.96 11.52 GB6
1835+4425 18 36 37.51 +44 28 31.08 11.65 NORTH6CM
1835+4425 18 36 37.51 +44 28 31.08 11.65 NORTH20CM
TGSSADR J183635.0+442835 18 36 34.99 +44 28 35.04 11.73 GMRTAS150M
VLSSr J183635.0+442834 18 36 34.99 +44 28 35.04 11.74 VLSSR
9 NVSS J183634+442834 18 36 34.99 +44 28 33.96 11.75 NVSS
TXS 1835+444 18 36 34.90 +44 28 33.96 11.76 TEXAS
WN 1835.0+4425 18 36 34.90 +44 28 33.96 11.77 WENSS
10 NVSS J183731+445023 18 37 31.61 +44 50 24.00 12.37 NVSS
11 NVSS J183557+443236 18 35 57.19 +44 32 36.96 12.80 NVSS
12 NVSS J183553+444738 18 35 53.81 +44 47 39.12 13.84 NVSS
13 HIP 91178 18 36 03.65 +44 28 01.56 15.03 HIPPARCOS
PPM 57302 18 36 03.60 +44 28 01.20 15.04 PPM
HD 172084 18 36 03.60 +44 28 01.20 15.04 HIC
BD+44 2935 18 36 03.55 +44 28 01.20 15.05 ACRS
SAO 47637 18 36 03.70 +44 27 59.76 15.05 SAO

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