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 J1539.4-3323

Field

Detected Excesses
Swift-XRT image of the field for 4FGL J1539.4-3323 Swift-XRT detections in the field for 4FGL J1539.4-3323

Detected Excesses (SNR(Sosta) > 3.0)

# R.A. (J2000) Dec. (J2000) Pos. Error (") Rate (cts/s) Counts SNR (Detect) SNR (Sosta)
1 15 39 51.82 -33 22 24.77 3.78 (2.3 ± 0.2) x 10-3 200 9.595 9.984
2 15 39 24.48 -33 28 37.97 3.89 (1.5 ± 0.2) x 10-3 137 8.107 8.044
3 15 39 48.90 -33 32 40.59 3.95 (9 ± 2) x 10-4 98 6.156 5.774
4 15 39 39.29 -33 25 29.23 3.91 (9 ± 2) x 10-4 120 5.335 5.437
5 15 38 54.09 -33 35 01.40 4.01 (6.3 ± 1.3) x 10-4 79 5.169 4.743
6 15 38 12.76 -33 23 00.57 4.11 (5.8 ± 1.2) x 10-4 53 4.506 4.672
7 15 39 00.79 -33 27 12.64 4.06 (5.6 ± 1.3) x 10-4 71 4.076 4.424
8 15 39 37.83 -33 19 42.26 3.91 (5.8 ± 1.4) x 10-4 110 4.116 4.282
9 15 38 47.81 -33 17 14.42 3.89 (5.2 ± 1.3) x 10-4 83 3.961 4.143
10 15 39 09.24 -33 30 20.89 4.07 (4.9 ± 1.2) x 10-4 67 4.055 4.082
11 15 40 00.05 -33 26 15.80 3.90 (4.6 ± 1.4) x 10-4 86 3.993 3.426
12 15 39 56.00 -33 30 15.85 3.99 (4.1 ± 1.3) x 10-4 64 3.585 3.126
13 15 38 17.02 -33 27 28.92 4.16 (3.1 ± 1.0) x 10-4 39 3.173 3.034

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 15 38 54.09 -33 35 01.40 4.01 (3.7 ± 1.1) x 10-4 79 3.990 3.536
2 15 39 50.73 -33 30 07.24 3.93 (3.4 ± 1.1) x 10-4 83 3.103 2.974
3 15 39 08.92 -33 13 57.91 3.90 (3.2 ± 1.1) x 10-4 67 2.925 2.838
4 15 39 31.93 -33 17 14.23 3.92 (3.4 ± 1.2) x 10-4 106 3.203 2.824
5 15 40 03.65 -33 24 06.02 3.99 (2.9 ± 1.1) x 10-4 74 2.922 2.691

X-Ray and Gamma Ray Catalogs

More Catalogs
Swift-XRT image with known X-ray and gamma ray sources for 4FGL J1539.4-3323 Swift-XRT image with known radio, optical and UV sources for 4FGL J1539.4-3323


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 J153929-332201 15 39 29.21 -33 22 00.84 2.16 NVSS
2 TGSSADR J153933.2-332540 15 39 33.31 -33 25 41.16 2.57 GMRTAS150M
3 NVSS J153911-332209 15 39 11.50 -33 22 09.12 3.19 NVSS
[SPT2015] ATCA J1539-3322 15 39 11.59 -33 22 05.88 3.22 FER2FUSRID
[PME2013] J1539-3322 15 39 11.59 -33 22 05.88 3.22 AT2FGLUS
GLEAM J153940-332216 15 39 40.39 -33 22 17.04 3.75 GLEAMEGCAT
4 NVSS J153941-332225 15 39 41.30 -33 22 26.04 3.85 NVSS
TGSSADR J153941.2-332222 15 39 41.21 -33 22 22.08 3.86 GMRTAS150M
SUMSS J153941-332215 15 39 41.30 -33 22 14.88 3.92 SUMSS
5 PGCC G338.71+17.54 15 39 05.11 -33 26 13.92 4.62 PLANCKGCC
6 NVSS J153916-331504 15 39 16.39 -33 15 03.96 9.00 NVSS
QORG J153949.2-333237 15 39 49.20 -33 32 36.96 10.13 QORGCAT
7 NVSS J153949-333240 15 39 49.20 -33 32 39.84 10.18 NVSS
8 PCCS2 030 G338.67+17.66 15 38 34.70 -33 22 06.96 10.50 PCCS030GHZ
9 PGC 3097178 15 40 20.90 -33 21 16.92 12.12 PGC2003
GLEAM J154021-333201 15 40 21.50 -33 32 02.04 14.43 GLEAMEGCAT

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