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 J1816.4-2727

Field

Detected Excesses
Swift-XRT image of the field for 4FGL J1816.4-2727 Swift-XRT detections in the field for 4FGL J1816.4-2727


No detected excesses found.

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 16 02.15 -27 15 39.85 8.62 (8 ± 3) x 10-3 7 2.226 2.475

X-Ray and Gamma Ray Catalogs

More Catalogs
Swift-XRT image with known X-ray and gamma ray sources for 4FGL J1816.4-2727 Swift-XRT image with known radio, optical and UV sources for 4FGL J1816.4-2727

Known X-Ray and Gamma Ray Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Observatory/Database Table
1 1RXS J181716.5-272921 18 17 16.51 -27 29 21.48 11.49 ROSAT
2 1RXS J181607.2-273908 18 16 07.20 -27 39 08.64 12.44 ROSAT

Known Radio, Optical and UV Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Database Table
1 HD 317279 18 16 29.95 -27 26 33.72 1.29 HDEC
2 HD 317278 18 16 31.03 -27 26 06.00 1.78 HDEC
3 SAO 186566 18 16 23.23 -27 24 50.04 2.59 SAO
CD-2712644 18 16 23.18 -27 24 48.24 2.62 ACRS
PPM 268157 18 16 23.18 -27 24 48.24 2.62 PPM
4 V1837 Sgr 18 16 16.94 -27 22 40.08 5.07 GCVS
5 NVSS J181556-272340 18 15 55.99 -27 23 40.92 7.51 NVSS
6 CGMW 4-384 18 16 14.21 -27 34 45.84 7.80 CGMW
7 HD 317280 18 16 16.13 -27 35 37.32 8.50 HDEC
8 HD 317277 18 16 03.55 -27 20 20.76 8.55 HDEC
9 HD 317281 18 16 00.10 -27 34 51.96 9.37 HDEC
10 V1957 Sgr 18 16 08.83 -27 18 37.08 9.51 GCVS
11 NSV 10458 18 16 32.40 -27 36 52.92 9.63 GCVSNSVARS
12 NVSS J181601-271859 18 16 01.10 -27 19 00.12 9.97 NVSS
MGPS J181601-271859 18 16 01.01 -27 19 00.12 9.99 MGPS2
13 V1955 Sgr 18 15 48.84 -27 33 24.48 10.12 GCVS
14 NVSS J181635-273717 18 16 35.11 -27 37 17.04 10.14 NVSS
15 NVSS J181554-271907 18 15 54.70 -27 19 06.96 10.72 NVSS
QORG J181554.6-271907 18 15 54.60 -27 19 06.96 10.73 QORGCAT
16 NVSS J181711-272351 18 17 12.00 -27 23 51.00 10.90 NVSS
17 CGMW 4-389 18 16 27.19 -27 15 50.04 11.55 CGMW
HD 317282 18 15 38.93 -27 32 51.72 11.69 HDEC
MGPS J181537-273303 18 15 37.99 -27 33 02.88 11.96 MGPS2
MGPS J181628-273920 18 16 28.80 -27 39 20.16 11.98 MGPS2
18 NVSS J181537-273259 18 15 37.51 -27 32 58.92 12.03 NVSS
TGSSADR J181533.2-272401 18 15 33.31 -27 24 01.08 12.06 GMRTAS150M
19 NVSS J181533-272359 18 15 33.31 -27 23 58.92 12.07 NVSS
TXS 1812-274 18 15 33.10 -27 24 02.16 12.09 TEXAS
MGPS J181533-272400 18 15 33.19 -27 23 60.00 12.09 MGPS2
20 HD 317276 18 15 37.34 -27 20 20.40 12.79 HDEC
21 WDS J18159-2716 AB 18 15 54.00 -27 16 00.12 13.35 WDS
WDS J18159-2716 AC 18 15 54.00 -27 16 00.12 13.35 WDS
22 HD 317363 18 17 15.07 -27 36 16.92 14.15 HDEC

Penn State University Goddard Space Flight Center Swift