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.

1FGL J0439.8-1857

Field

Detected Excesses

Swift-XRT image of the field for 1FGL J0439.8-1857 Swift-XRT detections in the field for 1FGL J0439.8-1857

Detected Excesses (SNR(Sosta) > 3.0)

# R.A. (J2000) Dec. (J2000) Pos. Error (") Rate (cts/s) Counts SNR (Detect) SNR (Sosta)
1 04 39 49.86 -19 00 59.80 6.31 (6 ± 2) x 10-3 18 3.828 3.927
2 04 40 30.20 -19 04 35.40 7.09 (3.1 ± 1.0) x 10-3 12 3.121 3.048

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 04 40 09.17 -18 51 02.15 7.48 (2.6 ± 0.9) x 10-3 10 2.728 2.759
2 04 39 24.60 -19 01 00.11 6.78 (2.0 ± 0.9) x 10-3 10 2.513 2.205

X-Ray and Gamma Ray Catalogs

More Catalogs

Swift-XRT image with known X-ray and gamma ray sources for 1FGL J0439.8-1857 Swift-XRT image with known radio, optical and UV sources for 1FGL J0439.8-1857


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 J043956-190027 04 39 56.30 -19 00 28.08 2.78 NVSS
PMN J0439-1900 04 39 48.70 -19 00 52.92 3.03 PMN
WISH B0437.6-1906A 04 39 49.90 -19 00 57.96 3.06 WISH
WISH B0437.6-1906 04 39 51.10 -19 01 00.12 3.08 WISH
WISH B0437.6-1906B 04 39 56.11 -19 00 50.04 3.10 WISH
2 NVSS J043949-190059 04 39 49.90 -19 01 00.12 3.10 NVSS
QORG J043949.7-190101 04 39 49.70 -19 01 00.84 3.12 QORGCAT
WISH B0437.2-1904 04 39 27.10 -18 58 23.16 5.79 WISH
3 NVSS J043926-185830 04 39 26.90 -18 58 30.00 5.84 NVSS
4 PGC 862497 04 40 07.70 -18 53 22.92 5.94 PGC2003
5 NVSS J043930-185334 04 39 30.79 -18 53 34.08 6.55 NVSS
6 PGC 862847 04 40 15.31 -18 51 38.16 8.44 PGC2003
7 NVSS J043935-190656 04 39 35.40 -19 06 56.88 9.79 NVSS
QORG J043935.4-190659 04 39 35.40 -19 06 59.04 9.83 QORGCAT
8 NVSS J043939-184809 04 39 39.79 -18 48 09.00 10.15 NVSS
WISH B0437.4-1853 04 39 40.01 -18 48 00.00 10.29 WISH
9 PPM 710848 04 39 05.54 -18 58 32.88 10.88 PPM
10 NVSS J043911-185141 04 39 11.81 -18 51 41.04 11.27 NVSS
WISH B0436.9-1857 04 39 11.71 -18 51 36.00 11.35 WISH
11 NVSS J043905-190149 04 39 05.59 -19 01 49.08 11.53 NVSS
WISH B0436.8-1907 04 39 04.99 -19 01 33.96 11.59 WISH
12 NVSS J044012-190911 04 40 12.19 -19 09 11.88 12.29 NVSS
13 NVSS J044041-185335 04 40 41.11 -18 53 35.16 12.50 NVSS
WISH B0437.1-1853 04 39 22.20 -18 47 12.84 12.76 WISH
14 PPM 214633 04 39 20.83 -19 08 39.12 12.95 PPM
BD-19 985 04 39 20.86 -19 08 39.48 12.95 ACRS
15 NVSS J043922-184655 04 39 22.20 -18 46 55.92 13.00 NVSS
16 NVSS J043909-184737 04 39 09.41 -18 47 36.96 14.34 NVSS

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