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 J0838.4-3952

Field

Detected Excesses

Swift-XRT image of the field for 4FGL J0838.4-3952 Swift-XRT detections in the field for 4FGL J0838.4-3952

Detected Excesses (SNR(Sosta) > 3.0)

# R.A. (J2000) Dec. (J2000) Pos. Error (") Rate (cts/s) Counts SNR (Detect) SNR (Sosta)
1 08 37 43.95 -39 53 20.24 4.72 (8.1 ± 1.4) x 10-3 45 6.169 5.663

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 08 38 03.86 -39 44 42.54 6.31 (2.5 ± 0.8) x 10-3 15 3.020 2.927
2 08 38 43.17 -39 40 56.36 6.93 (1.9 ± 0.7) x 10-3 11 2.676 2.760
3 08 38 02.54 -40 00 53.40 7.71 (1.6 ± 0.7) x 10-3 8 2.287 2.367
4 08 37 53.12 -39 57 32.21 6.41 (1.5 ± 0.7) x 10-3 10 2.271 2.210

X-Ray and Gamma Ray Catalogs

More Catalogs

Swift-XRT image with known X-ray and gamma ray sources for 4FGL J0838.4-3952 Swift-XRT image with known radio, optical and UV sources for 4FGL J0838.4-3952

Known X-Ray and Gamma Ray Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Observatory/Database Table
1 1RXH J083848.0-400234 08 38 48.07 -40 02 34.44 10.76 ROSAT
1BMW 083848.3-400238 08 38 48.31 -40 02 38.04 10.83 ROSAT
2 X083912.51-400128.9 08 39 12.50 -40 01 28.92 12.41 CHANDRA

Known Radio, Optical and UV Sources

# Source Name R.A. (J2000) Dec. (J2000) Offset (') Database Table
1 SAO 199450 08 38 10.32 -39 51 59.76 3.33 SAO
CD-39 4605 08 38 10.32 -39 51 59.40 3.33 ACRS
PPM 285471 08 38 10.27 -39 51 59.04 3.34 PPM
2 PSR J0838-3947 08 38 30.79 -39 47 21.84 5.25 ATNFPULSAR
PSR J0838-3947 08 38 30.79 -39 47 21.84 5.25 PMPULSAR
3 TGSSADR J083806.1-395701 08 38 06.10 -39 57 02.16 6.05 GMRTAS150M
4 PMN J0839-3952 08 39 00.79 -39 52 10.92 6.42 PMN
5 PPM 741375 08 38 18.55 -39 45 42.84 7.07 PPM
CD-39 4608 08 38 18.55 -39 45 42.84 7.07 ACRS
6 PPM 741366 08 37 59.16 -39 57 33.84 7.37 PPM
7 WDS J08390-3948 08 39 00.00 -39 47 60.00 7.75 WDS
8 NVSS J083746-395032 08 37 46.90 -39 50 33.00 8.04 NVSS
9 PPM 741373 08 38 15.41 -39 44 50.28 8.07 PPM
10 NVSS J083756-395837 08 37 56.90 -39 58 36.84 8.41 NVSS
TGSSADR J083756.9-395837 08 37 56.90 -39 58 37.92 8.42 GMRTAS150M
QORG J083842.9-400028 08 38 42.89 -40 00 28.08 8.44 QORGCAT
11 NVSS J083842-400030 08 38 42.79 -40 00 29.88 8.46 NVSS
MGPS J083756-395841 08 37 57.00 -39 58 41.88 8.46 MGPS2
12 V452 Vel 08 37 43.39 -39 53 35.52 8.50 GCVS
MGPS J083842-400034 08 38 42.50 -40 00 33.84 8.51 MGPS2
TGSSADR J083842.2-400037 08 38 42.29 -40 00 37.08 8.54 GMRTAS150M
13 NVSS J083745-394905 08 37 45.31 -39 49 05.88 8.79 NVSS
TGSSADR J083914.4-395022 08 39 14.50 -39 50 21.84 9.30 GMRTAS150M
MGPS J083914-395022 08 39 14.71 -39 50 21.84 9.33 MGPS2
14 NVSS J083914-395018 08 39 14.71 -39 50 18.96 9.36 NVSS
15 NVSS J083755-394525 08 37 55.80 -39 45 25.92 9.37 NVSS
16 Wray 16-24 08 38 00.00 -39 43 59.88 10.06 PLNEBULAE
17 TGSSADR J083918.6-395020 08 39 18.60 -39 50 21.12 10.08 GMRTAS150M
18 QORG J083847.8-400239 08 38 47.81 -40 02 39.12 10.81 QORGCAT
19 SAO 199474 08 39 18.89 -39 47 58.92 10.90 SAO
PPM 285497 08 39 18.91 -39 47 57.84 10.91 PPM
Rns 20600 08 39 18.91 -39 47 57.48 10.91 CPSTARS
HIP 42453 08 39 18.91 -39 47 57.48 10.91 HIPPARCOS
CD-39 4633 08 39 18.94 -39 47 57.48 10.91 ACRS
HD 73901 08 39 18.94 -39 47 57.84 10.91 HIC
20 PMN J0839-3950 08 39 24.31 -39 49 59.88 11.22 PMN
21 PPM 313366 08 38 44.86 -40 04 00.12 11.91 PPM
NSV 4170 08 38 44.90 -40 04 00.12 11.91 GCVSNSVARS
SAO 199465 08 38 44.93 -40 04 00.12 11.91 SAO
CD-39 4624 08 38 44.88 -40 04 00.12 11.91 ACRS
22 WDS J08379-4003 08 37 54.00 -40 02 60.00 12.24 WDS
PPM 756077 08 37 54.02 -40 03 02.88 12.28 PPM
CD-39 4595 08 37 54.07 -40 03 03.60 12.28 ACRS

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