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 J1855.2+0756

Field

Detected Excesses
Swift-XRT image of the field for 4FGL J1855.2+0756 Swift-XRT detections in the field for 4FGL J1855.2+0756

Detected Excesses (SNR(Sosta) > 3.0)

# R.A. (J2000) Dec. (J2000) Pos. Error (") Rate (cts/s) Counts SNR (Detect) SNR (Sosta)
1 18 55 19.90 +07 51 39.93 5.14 (5.6 ± 1.1) x 10-3 34 5.073 4.929

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 18 55 06.23 +07 52 58.57 6.21 (1.4 ± 0.6) x 10-3 15 2.363 2.250

X-Ray and Gamma Ray Catalogs

More Catalogs
Swift-XRT image with known X-ray and gamma ray sources for 4FGL J1855.2+0756 Swift-XRT image with known radio, optical and UV sources for 4FGL J1855.2+0756

Known X-Ray and Gamma Ray Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Observatory/Database Table
1 2E 1852.3+0757 18 54 48.05 +08 01 29.28 8.14 EINSTEIN
2E 1852.3+0757 18 54 48.00 +08 01 29.28 8.15 EINSTEIN

Known Radio, Optical and UV Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Database Table
1 NVSS J185524+075448 18 55 24.60 +07 54 47.88 3.12 NVSS
2 NVSS J185527+075628 18 55 27.60 +07 56 27.96 3.15 NVSS
3 NVSS J185521+075339 18 55 21.41 +07 53 39.12 3.54 NVSS
4 NVSS J185520+075140 18 55 20.40 +07 51 39.96 5.32 NVSS
5 SAO 124040 18 54 46.58 +07 56 44.88 7.03 SAO
HIP 92821 18 54 46.54 +07 56 45.60 7.04 HIPPARCOS
BD+07 3893 18 54 46.51 +07 56 45.24 7.05 ACRS
HD 175372 18 54 46.51 +07 56 45.60 7.05 HIC
PPM 166787 18 54 46.51 +07 56 45.60 7.05 PPM
6 PGCC G40.39+2.90 18 54 42.10 +07 57 19.08 8.16 PLANCKGCC
7 NVSS J185457+080428 18 54 58.01 +08 04 28.92 8.74 NVSS
8 PGCC G40.32+2.69 18 55 20.21 +07 47 53.88 9.01 PLANCKGCC
9 NVSS J185528+080618 18 55 28.80 +08 06 19.08 10.09 NVSS
10 NVSS J185556+075602 18 55 56.71 +07 56 02.04 10.36 NVSS
TGSSADR J185556.8+075601 18 55 56.81 +07 56 02.04 10.40 GMRTAS150M
11 NVSS J185458+074557 18 54 58.70 +07 45 56.88 11.60 NVSS
12 BD+07 3890 18 54 30.10 +08 00 14.76 11.63 ACRS
PPM 166779 18 54 30.07 +08 00 14.40 11.63 PPM
SAO 124031 18 54 30.02 +08 00 13.32 11.64 SAO
13 SAO 124037 18 54 42.91 +08 05 57.48 12.10 SAO
PPM 166785 18 54 42.89 +08 05 57.84 12.11 PPM
BD+07 3892 18 54 42.86 +08 05 58.20 12.12 ACRS
14 NVSS J185602+080407 18 56 02.21 +08 04 06.96 13.77 NVSS
TGSSADR J185602.2+080406 18 56 02.21 +08 04 05.88 13.78 GMRTAS150M

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