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 J1740.1-1928

Field

Detected Excesses
Swift-XRT image of the field for 4FGL J1740.1-1928 Swift-XRT detections in the field for 4FGL J1740.1-1928


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 17 40 06.20 -19 36 39.76 5.31 (2.8 ± 1.2) x 10-3 13 2.616 2.320
2 17 40 12.42 -19 31 34.73 5.64 (2.5 ± 1.2) x 10-3 25 2.578 2.178
3 17 40 12.67 -19 33 04.98 5.14 (2.4 ± 1.2) x 10-3 23 2.572 1.972

X-Ray and Gamma Ray Catalogs

More Catalogs
Swift-XRT image with known X-ray and gamma ray sources for 4FGL J1740.1-1928 Swift-XRT image with known radio, optical and UV sources for 4FGL J1740.1-1928


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 LDN 229 17 40 09.29 -19 30 33.12 1.87 LDN
2 LDN 231 17 40 21.31 -19 31 32.16 4.32 LDN
3 NVSS J173948-193336 17 39 48.60 -19 33 37.08 6.57 NVSS
4 808- 13 17 40 18.36 -19 36 38.52 8.32 NLTT
5 PGCC G7.25+6.07 17 39 33.60 -19 35 21.84 10.35 PLANCKGCC
6 NVSS J174051-193011 17 40 51.79 -19 30 11.88 10.58 NVSS
7 NVSS J173958-194026 17 39 58.80 -19 40 27.12 11.88 NVSS
8 NVSS J173947-193943 17 39 47.81 -19 39 42.84 11.91 NVSS
9 LDN 226 17 40 33.48 -19 39 31.32 12.42 LDN
10 PGCC G7.35+5.82 17 40 42.41 -19 38 06.00 12.48 PLANCKGCC
11 LDN 228 17 40 45.43 -19 37 30.36 12.54 LDN

Penn State University Goddard Space Flight Center Swift