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 J1856.1-1222

Field

Detected Excesses
Swift-XRT image of the field for 4FGL J1856.1-1222 Swift-XRT detections in the field for 4FGL J1856.1-1222

Detected Excesses (SNR(Sosta) > 3.0)

# R.A. (J2000) Dec. (J2000) Pos. Error (") Rate (cts/s) Counts SNR (Detect) SNR (Sosta)
1 18 56 06.65 -12 21 48.61 4.41 (3.1 ± 0.4) x 10-2 80 8.452 8.138

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 56 09.56 -12 27 35.63 7.97 (2.9 ± 1.2) x 10-3 8 2.410 2.423
2 18 56 25.46 -12 17 00.13 6.65 (2.2 ± 1.2) x 10-3 9 2.270 1.866
3 18 56 00.05 -12 20 31.31 6.93 (1.7 ± 1.1) x 10-3 11 2.272 1.464

X-Ray and Gamma Ray Catalogs

More Catalogs
Swift-XRT image with known X-ray and gamma ray sources for 4FGL J1856.1-1222 Swift-XRT image with known radio, optical and UV sources for 4FGL J1856.1-1222


No known X-ray or gamma ray sources found.

Known Radio, Optical and UV Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Database Table
1 NVSS J185606-122148 18 56 06.41 -12 21 47.88 0.80 NVSS
2 NVSS J185617-122305 18 56 17.81 -12 23 04.92 2.48 NVSS
3 NVSS J185554-122732 18 55 54.31 -12 27 33.12 6.03 NVSS
4 NVSS J185549-121730 18 55 49.51 -12 17 30.84 6.72 NVSS
5 NVSS J185617-122918 18 56 17.21 -12 29 18.96 7.18 NVSS
6 PPM 235241 18 55 38.74 -12 20 40.92 7.35 PPM
TGSSADR J185553.9-121557 18 55 54.00 -12 15 57.96 7.37 GMRTAS150M
7 NVSS J185553-121559 18 55 53.71 -12 16 00.12 7.38 NVSS
8 NVSS J185624-121503 18 56 24.31 -12 15 02.88 8.46 NVSS
TGSSADR J185624.4-121501 18 56 24.50 -12 15 01.08 8.51 GMRTAS150M
9 NVSS J185614-121237 18 56 14.81 -12 12 38.16 10.02 NVSS
10 NVSS J185545-121341 18 55 45.60 -12 13 41.16 10.37 NVSS
TGSSADR J185524.2-122405 18 55 24.19 -12 24 06.12 10.78 GMRTAS150M
11 NVSS J185524-122403 18 55 24.10 -12 24 02.88 10.80 NVSS
12 NVSS J185652-121653 18 56 52.51 -12 16 53.04 12.27 NVSS
13 NVSS J185650-122906 18 56 50.81 -12 29 07.08 12.38 NVSS
14 NVSS J185523-123204 18 55 23.11 -12 32 04.92 14.53 NVSS
TGSSADR J185656.7-121411 18 56 56.71 -12 14 11.04 14.54 GMRTAS150M
15 NVSS J185656-121410 18 56 56.71 -12 14 11.04 14.55 NVSS
16 NVSS J185528-123349 18 55 28.20 -12 33 48.96 14.90 NVSS
17 WISH B1854.1-1217 18 56 56.71 -12 13 08.04 15.17 WISH

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