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 J1538.9+0425

Field

Detected Excesses
Swift-XRT image of the field for 4FGL J1538.9+0425 Swift-XRT detections in the field for 4FGL J1538.9+0425

Detected Excesses (SNR(Sosta) > 3.0)

# R.A. (J2000) Dec. (J2000) Pos. Error (") Rate (cts/s) Counts SNR (Detect) SNR (Sosta)
1 15 39 01.39 +04 27 50.53 5.96 (6 ± 2) x 10-3 22 3.857 3.852

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 52.22 +04 30 10.51 4.88 (4.0 ± 1.4) x 10-3 34 3.353 2.784
2 15 39 27.02 +04 25 17.70 6.52 (3.0 ± 1.1) x 10-3 12 2.906 2.665

X-Ray and Gamma Ray Catalogs

More Catalogs
Swift-XRT image with known X-ray and gamma ray sources for 4FGL J1538.9+0425 Swift-XRT image with known radio, optical and UV sources for 4FGL J1538.9+0425

Known X-Ray and Gamma Ray Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Observatory/Database Table
1 2RXS J153853.2+043025 15 38 53.21 +04 30 25.56 4.57 ROSAT
2RXS J153853.2+043025 15 38 53.21 +04 30 25.56 4.57 ROSAT
1RXS J153853.2+043028 15 38 53.21 +04 30 28.44 4.61 ROSAT
2 2RXS J153856.8+043206 15 38 56.83 +04 32 06.72 6.19 ROSAT
2RXS J153856.8+043206 15 38 56.83 +04 32 06.72 6.19 ROSAT

Known Radio, Optical and UV Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Database Table
QORG J153916.6+042653 15 39 16.61 +04 26 53.16 5.15 QORGCAT
1 NVSS J153916+042650 15 39 16.70 +04 26 49.92 5.16 NVSS
FIRST J153916.6+042652 15 39 16.61 +04 26 52.08 5.16 FIRST
TGSSADR J153916.6+042650 15 39 16.70 +04 26 51.00 5.16 GMRTAS150M
2 1536+0439B 15 39 09.70 +04 30 14.04 5.46 NORTH6CM
3 FIRST J153918.0+042424 15 39 18.00 +04 24 24.12 5.63 FIRST
4 FIRST J153833.6+042634 15 38 33.60 +04 26 34.08 5.68 FIRST
MITG J1539+0430 15 39 09.10 +04 30 38.88 5.70 MITGB6CM
GB6 J1539+0430 15 39 10.20 +04 30 30.96 5.75 GB6
5 PCCS2 217 G011.00+44.08 15 39 12.91 +04 30 06.84 5.88 PCCS217GHZ
TGSSADR J153909.9+043050 15 39 10.01 +04 30 50.04 5.98 GMRTAS150M
6 NVSS J153910+043051 15 39 10.10 +04 30 51.84 6.01 NVSS
CRATES J153910+043031 15 39 10.10 +04 30 51.12 6.01 CRATES
FIRST J153910.1+043051 15 39 10.10 +04 30 51.12 6.01 FIRST
QORG J153910.1+043052 15 39 10.10 +04 30 51.84 6.02 QORGCAT
PMN J1539+0430 15 39 10.70 +04 30 51.12 6.10 PMN
7 PGC 1266764 15 38 49.70 +04 19 54.84 6.23 PGC2003
8 NVSS J153836+043015 15 38 36.60 +04 30 15.84 6.54 NVSS
9 NVSS J153904+043207 15 39 04.90 +04 32 08.16 6.56 NVSS
10 PCCS2 143 G011.02+44.10 15 39 11.11 +04 31 22.08 6.57 PCCS143GHZ
FIRST J153924.2+042513 15 39 24.31 +04 25 14.16 7.02 FIRST
11 NVSS J153924+042508 15 39 24.70 +04 25 08.04 7.12 NVSS
FIRST J153919.4+042140 15 39 19.39 +04 21 41.04 7.17 FIRST
12 NVSS J153919+042139 15 39 19.61 +04 21 38.88 7.21 NVSS
TGSSADR J153919.6+042140 15 39 19.70 +04 21 41.04 7.21 GMRTAS150M
13 1536+0439A 15 38 30.31 +04 29 53.16 7.58 NORTH6CM
14 SDSS J15394+0425 15 39 27.10 +04 25 18.12 7.71 VERONCAT
GB6 J1538+0430 15 38 30.00 +04 30 03.96 7.75 GB6
PMN J1538+0430 15 38 30.79 +04 30 33.12 7.86 PMN
15 SDSS J15384+0423 15 38 25.80 +04 23 36.96 7.94 VERONCAT
FIRST J153830.5+043042 15 38 30.50 +04 30 42.12 8.00 FIRST
16 NVSS J153830+043041 15 38 30.50 +04 30 42.12 8.01 NVSS
17 NVSS J153928+042429 15 39 28.39 +04 24 29.16 8.13 NVSS
18 MITG J1538+0431 15 38 28.90 +04 31 09.12 8.59 MITGB6CM
19 PCCS2 857 G011.04+44.17 15 38 59.09 +04 34 31.08 8.62 PCCS857GHZ
20 1537+0436L 15 39 31.90 +04 26 30.12 8.89 NORTH20CM
21 NVSS J153855+043456 15 38 55.01 +04 34 57.00 9.02 NVSS
QORG J153855.0+043457 15 38 55.01 +04 34 57.00 9.03 QORGCAT
UZC J153854.9+043457 15 38 54.91 +04 34 57.00 9.03 UZC
PGC 55687 15 38 54.91 +04 34 58.08 9.05 PGC2003
15364+0445 15 38 54.24 +04 34 59.88 9.09 ZCAT
Unknown 15 38 54.31 +04 34 59.88 9.09 RC3
22 UGC 9945 15 38 53.28 +04 35 16.80 9.38 UGC
MCG+01-40-009 15 38 53.28 +04 35 16.80 9.38 MCG
23 FIRST J153822.4+043022 15 38 22.51 +04 30 23.04 9.53 FIRST
FIRST J153934.0+042407 15 39 34.01 +04 24 06.84 9.58 FIRST
24 NVSS J153934+042412 15 39 34.39 +04 24 12.96 9.66 NVSS
TGSSADR J153934.4+042409 15 39 34.39 +04 24 10.08 9.68 GMRTAS150M
FIRST J153934.6+042412 15 39 34.61 +04 24 11.88 9.71 FIRST
QORG J153816.2+042541 15 38 16.20 +04 25 41.16 9.99 QORGCAT
FIRST J153816.1+042540 15 38 16.20 +04 25 41.16 9.99 FIRST
25 NVSS J153816+042541 15 38 16.20 +04 25 41.16 10.00 NVSS
QORG J153841.2+043545 15 38 41.21 +04 35 44.88 10.52 QORGCAT
FIRST J153841.1+043545 15 38 41.21 +04 35 44.88 10.52 FIRST
26 NVSS J153841+043546 15 38 40.99 +04 35 45.96 10.55 NVSS
27 FIRST J153859.8+043646 15 38 59.90 +04 36 47.16 10.89 FIRST
QORG J153900.0+043648 15 39 00.00 +04 36 47.88 10.91 QORGCAT
28 NVSS J153916+041549 15 39 16.20 +04 15 50.04 11.26 NVSS
FIRST J153916.6+041542 15 39 16.61 +04 15 42.84 11.40 FIRST
FIRST J153809.0+042434 15 38 09.00 +04 24 33.84 11.86 FIRST
29 NVSS J153808+042435 15 38 08.71 +04 24 34.92 11.93 NVSS
30 FIRST J153832.1+041534 15 38 32.11 +04 15 33.84 11.99 FIRST
31 NVSS J153809+043350 15 38 09.60 +04 33 51.12 14.08 NVSS
FIRST J153809.6+043355 15 38 09.70 +04 33 55.08 14.10 FIRST
TGSSADR J153809.6+043355 15 38 09.60 +04 33 56.16 14.11 GMRTAS150M
GLEAM J153808+041618 15 38 08.40 +04 16 18.12 15.33 GLEAMEGCAT
32 NVSS J153808+041616 15 38 08.21 +04 16 15.96 15.39 NVSS
TGSSADR J153808.1+041617 15 38 08.21 +04 16 17.04 15.39 GMRTAS150M
FIRST J153808.3+041611 15 38 08.30 +04 16 12.00 15.42 FIRST

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