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 J1808.4-3358

Field

Detected Excesses
Swift-XRT image of the field for 4FGL J1808.4-3358 Swift-XRT detections in the field for 4FGL J1808.4-3358

Detected Excesses (SNR(Sosta) > 3.0)

# R.A. (J2000) Dec. (J2000) Pos. Error (") Rate (cts/s) Counts SNR (Detect) SNR (Sosta)
1 18 08 52.68 -33 52 34.45 4.61 (1.8 ± 0.5) x 10-3 38 3.800 3.685
2 18 08 12.89 -33 57 29.20 4.46 (2.1 ± 0.6) x 10-3 52 3.552 3.354

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 18 08 51.36 -33 56 48.83 4.47 (1.5 ± 0.5) x 10-3 49 3.432 2.985
2 18 08 17.90 -33 51 50.07 4.86 (1.3 ± 0.5) x 10-3 32 3.392 2.871
3 18 08 25.35 -33 56 10.13 4.51 (1.4 ± 0.5) x 10-3 43 3.690 2.819
4 18 08 20.12 -33 57 55.31 4.19 (1.1 ± 0.5) x 10-3 74 3.165 2.325
5 18 08 31.87 -34 00 39.07 4.44 (10 ± 4) x 10-4 53 2.610 2.241

X-Ray and Gamma Ray Catalogs

More Catalogs
Swift-XRT image with known X-ray and gamma ray sources for 4FGL J1808.4-3358 Swift-XRT image with known radio, optical and UV sources for 4FGL J1808.4-3358


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 J180823-335946 18 08 23.71 -33 59 47.04 0.88 NVSS
2 V1278 Sgr 18 08 39.55 -34 01 42.96 4.21 GCVS
3 [PME2013] J1808-3355 18 08 14.59 -33 55 03.00 4.36 AT2FGLUS
[SPT2015] ATCA J1808-3355 18 08 14.59 -33 55 03.00 4.37 FER2FUSRID
4 HD 321336 18 08 47.66 -33 54 56.52 6.24 HDEC
PPM 749421 18 08 47.66 -33 54 55.80 6.24 PPM
5 HD 321337 18 08 58.03 -33 58 13.44 7.00 HDEC
6 CGMW 4-192 18 08 37.70 -33 52 05.16 7.35 CGMW
PGC 205636 18 08 37.70 -33 52 05.16 7.35 PGC2003
7 HD 321351 18 08 47.86 -34 04 43.32 7.58 HDEC
[PME2013] J1807-3355 18 07 51.31 -33 55 32.88 7.65 AT2FGLUS
[SPT2015] ATCA J1807-3355 18 07 51.19 -33 55 31.08 7.68 FER2FUSRID
8 NVSS J180751-335529 18 07 51.31 -33 55 30.00 7.68 NVSS
TGSSADR J180750.7-335535 18 07 50.81 -33 55 36.12 7.73 GMRTAS150M
MGPS J180751-335524 18 07 51.10 -33 55 23.88 7.74 MGPS2
9 NVSS J180841-335103 18 08 41.21 -33 51 03.96 8.58 NVSS
10 PGC 205628 18 08 24.10 -34 08 02.04 9.13 PGC2003
CGMW 4-184 18 08 24.10 -34 08 02.04 9.13 CGMW
11 HD 321338 18 09 04.10 -33 54 34.56 9.30 HDEC
12 HD 321259 18 08 03.07 -34 07 56.64 10.07 HDEC
PPM 749411 18 08 03.12 -34 07 57.00 10.07 PPM
13 HD 321258 18 07 55.25 -34 07 05.88 10.18 HDEC
14 PPM 297312 18 09 13.39 -34 00 28.44 10.27 PPM
CD-3412522 18 09 13.44 -34 00 28.08 10.28 ACRS
SAO 209777 18 09 13.63 -34 00 28.80 10.32 SAO
15 PPM 749406 18 07 35.59 -34 03 29.88 11.12 PPM
16 NVSS J180914-335415 18 09 14.71 -33 54 15.12 11.41 NVSS
17 HD 321350 18 09 10.22 -34 05 55.68 11.81 HDEC
18 NVSS J180751-334827 18 07 51.91 -33 48 28.08 12.44 NVSS
MGPS J180751-334825 18 07 51.79 -33 48 25.92 12.47 MGPS2
TGSSADR J180751.8-334825 18 07 51.91 -33 48 24.84 12.47 GMRTAS150M
19 NSV 10257 18 09 16.01 -34 06 27.00 13.08 GCVSNSVARS
20 HD 321240 18 07 27.60 -33 53 03.12 13.16 HDEC
21 SAO 209740 18 07 37.94 -34 07 56.64 13.21 SAO
HD 321256 18 07 37.99 -34 07 58.44 13.22 HIC
HIP 88800 18 07 38.04 -34 07 59.16 13.23 HIPPARCOS
CD-3412485 18 07 38.02 -34 07 59.16 13.23 ACRS
PPM 297272 18 07 38.04 -34 07 59.52 13.23 PPM
HD 321256 18 07 38.04 -34 07 59.52 13.23 HDEC
22 V1820 Sgr 18 07 30.96 -33 51 38.16 13.26 GCVS
23 NVSS J180727-334903 18 07 27.60 -33 49 04.08 15.36 NVSS
TGSSADR J180727.6-334903 18 07 27.60 -33 49 03.00 15.36 GMRTAS150M
MGPS J180727-334903 18 07 27.50 -33 49 03.00 15.38 MGPS2

Penn State University Goddard Space Flight Center Swift