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 J1521.8-5734

Field

Detected Excesses
Swift-XRT image of the field for 1FGL J1521.8-5734 Swift-XRT detections in the field for 1FGL J1521.8-5734

Detected Excesses (SNR(Sosta) > 3.0)

# R.A. (J2000) Dec. (J2000) Pos. Error (") Rate (cts/s) Counts SNR (Detect) SNR (Sosta)
1 15 20 39.60 -57 28 40.41 3.94 (1.7 ± 0.2) x 10-2 158 12.280 11.310
2 15 21 12.52 -57 39 12.00 4.55 (5.4 ± 0.9) x 10-3 52 6.012 5.899

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 22 56.85 -57 37 03.99 4.44 (1.2 ± 0.6) x 10-3 31 2.868 2.154
2 15 22 56.07 -57 38 00.07 4.46 (1.3 ± 0.6) x 10-3 24 2.938 2.079
3 15 22 48.60 -57 39 10.34 4.56 (1.1 ± 0.5) x 10-3 35 3.662 2.033
4 15 22 33.84 -57 41 23.05 4.60 (1.1 ± 0.5) x 10-3 30 2.452 1.986

X-Ray and Gamma Ray Catalogs

More Catalogs
Swift-XRT image with known X-ray and gamma ray sources for 1FGL J1521.8-5734 Swift-XRT image with known radio, optical and UV sources for 1FGL J1521.8-5734

Known X-Ray and Gamma Ray Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Observatory/Database Table
1 2RXP J152042.3-572810 15 20 42.24 -57 28 10.92 10.67 ROSAT
2 1WGA J1520.6-5728 15 20 37.99 -57 28 27.48 11.01 ROSAT
3 3XMM J152102.0-572345 15 21 02.11 -57 23 45.96 12.03 XMM-NEWTON
4 3XMM J152106.4-572216 15 21 06.48 -57 22 16.68 13.06 XMM-NEWTON
5 3XMM J152051.2-572239 15 20 51.22 -57 22 39.36 13.75 XMM-NEWTON
3XMM J152031.3-572335 15 20 31.34 -57 23 35.52 14.73 XMM-NEWTON
6 X152030.44-572334.5 15 20 30.43 -57 23 34.44 14.83 CHANDRA

Known Radio, Optical and UV Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Database Table
1 PSR J1522-5735 15 22 05.30 -57 34 59.88 2.43 ATNFPULSAR
2 MGPS J152203-573052 15 22 03.79 -57 30 52.92 3.75 MGPS2
3 PMN J1521-5738 15 21 48.19 -57 38 02.04 4.00 PMN
4 MGPS J152118-573453 15 21 18.70 -57 34 53.04 4.12 MGPS2
5 SNR G321.9-00.3 15 20 40.01 -57 34 00.12 9.21 SNRGREEN
6 MSC 321.9-0.3 15 20 40.01 -57 36 00.00 9.41 MOSTSNRCAT
7 MGPS J152258-573000 15 22 58.70 -57 30 01.08 10.22 MGPS2
8 MGPS J152154-574429 15 21 54.79 -57 44 29.04 10.49 MGPS2
9 AJG 031 15 20 39.00 -57 39 43.92 10.94 DIXON
AG G321.9-0.3 15 20 37.01 -57 39 46.08 11.19 DIXON
10 PMN J1521-5745 15 21 12.60 -57 45 27.00 12.40 PMN
11 MGPS J152307-574118 15 23 07.39 -57 41 18.96 12.80 MGPS2
12 MGPS J152042-574550 15 20 42.70 -57 45 51.12 14.75 MGPS2

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