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 J1856.1-1217

Field

Detected Excesses
Swift-XRT image of the field for 3FGL J1856.1-1217 Swift-XRT detections in the field for 3FGL J1856.1-1217

Detected Excesses (SNR(Sosta) > 3.0)

# R.A. (J2000) Dec. (J2000) Pos. Error (") Rate (cts/s) Counts SNR (Detect) SNR (Sosta)
1 18 56 06.61 -12 21 47.79 4.40 (3.0 ± 0.4) x 10-2 78 8.268 8.160

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 08.29 -12 18 37.02 6.52 (4 ± 2) x 10-3 17 2.885 2.587
2 18 56 09.56 -12 27 33.64 7.48 (3.3 ± 1.4) x 10-3 8 2.573 2.425

X-Ray and Gamma Ray Catalogs

More Catalogs
Swift-XRT image with known X-ray and gamma ray sources for 3FGL J1856.1-1217 Swift-XRT image with known radio, optical and UV sources for 3FGL J1856.1-1217


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 3.82 NVSS
TGSSADR J185553.9-121557 18 55 54.00 -12 15 57.96 3.93 GMRTAS150M
2 NVSS J185553-121559 18 55 53.71 -12 16 00.12 3.98 NVSS
3 NVSS J185549-121730 18 55 49.51 -12 17 30.84 4.48 NVSS
4 NVSS J185624-121503 18 56 24.31 -12 15 02.88 4.99 NVSS
TGSSADR J185624.4-121501 18 56 24.50 -12 15 01.08 5.05 GMRTAS150M
5 NVSS J185614-121237 18 56 14.81 -12 12 38.16 5.64 NVSS
6 NVSS J185617-122305 18 56 17.81 -12 23 04.92 5.65 NVSS
7 NVSS J185545-121341 18 55 45.60 -12 13 41.16 6.92 NVSS
8 NVSS J185554-120958 18 55 54.41 -12 09 57.96 8.66 NVSS
TGSSADR J185554.6-120956 18 55 54.60 -12 09 56.88 8.67 GMRTAS150M
PMN J1855-1210 18 55 52.90 -12 10 06.96 8.67 PMN
9 NVSS J185554-122732 18 55 54.31 -12 27 33.12 10.10 NVSS
10 NVSS J185652-121653 18 56 52.51 -12 16 53.04 11.00 NVSS
11 NVSS J185617-122918 18 56 17.21 -12 29 18.96 11.55 NVSS
TGSSADR J185524.2-122405 18 55 24.19 -12 24 06.12 12.26 GMRTAS150M
12 NVSS J185524-122403 18 55 24.10 -12 24 02.88 12.26 NVSS
TGSSADR J185656.7-121411 18 56 56.71 -12 14 11.04 12.56 GMRTAS150M
13 NVSS J185656-121410 18 56 56.71 -12 14 11.04 12.56 NVSS
14 WISH B1854.1-1217 18 56 56.71 -12 13 08.04 12.92 WISH
15 NVSS J185537-120649 18 55 37.20 -12 06 48.96 13.44 NVSS
16 NVSS J185650-122906 18 56 50.81 -12 29 07.08 15.30 NVSS

Penn State University Goddard Space Flight Center Swift