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.

4FGL J1855.2+0456

Field

Detected Excesses

Swift-XRT detections in the field for 4FGL J1855.2+0456

Detected Excesses (SNR(Sosta) > 3.0)

#	R.A. (J2000)	Dec. (J2000)	Pos. Error (")	Rate (cts/s)	Counts	SNR (Detect)	SNR (Sosta)
1	18 55 02.90	+04 59 44.82	4.50	(2.0 ± 0.3) x 10^-2	70	8.125	7.724

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 55 24.68	+05 03 52.05	7.97	(2.9 ± 1.0) x 10^-3	9	2.214	2.881
2	18 54 58.38	+05 03 32.13	7.71	(2.3 ± 1.0) x 10^-3	9	2.425	2.388
3	18 55 09.59	+04 57 22.99	6.78	(2.5 ± 1.1) x 10^-3	13	2.602	2.376

X-Ray and Gamma Ray Catalogs

More Catalogs

Swift-XRT image with known radio, optical and UV sources for 4FGL J1855.2+0456

Known X-Ray and Gamma Ray Sources

#	Source Name	R.A. (J2000)	Dec. (J2000)	Offset (')	Observatory/Database Table
1	4XMM J185531.4+045432	18 55 31.44	+04 54 32.76	4.38	XMM-NEWTON
2	4XMM J185520.8+045203	18 55 20.86	+04 52 03.72	4.67	XMM-NEWTON
3	4XMM J185538.7+045510	18 55 38.78	+04 55 10.56	5.89	XMM-NEWTON
4	4XMM J185541.9+045523	18 55 41.93	+04 55 23.52	6.61	XMM-NEWTON
5	4XMM J185547.1+045647	18 55 47.11	+04 56 47.76	7.80	XMM-NEWTON
6	4XMM J185545.6+045323	18 55 45.70	+04 53 23.64	8.09	XMM-NEWTON
7	4XMM J185546.0+045129	18 55 46.08	+04 51 29.52	9.08	XMM-NEWTON
8	4XMM J185556.9+045750	18 55 56.95	+04 57 50.40	10.33	XMM-NEWTON

Known Radio, Optical and UV Sources

#	Source Name	R.A. (J2000)	Dec. (J2000)	Offset (')	Database Table
1	NVSS J185508+045504	18 55 08.59	+04 55 05.16	2.34	NVSS
2	NVSS J185516+045159	18 55 16.70	+04 52 00.12	4.57	NVSS
3	NVSS J185444+045724	18 54 44.40	+04 57 24.84	7.87	NVSS
	TGSSADR J185443.8+045716	18 54 43.80	+04 57 16.92	8.00	GMRTAS150M
4	VLSSr J185534.7+050314	18 55 34.70	+05 03 14.04	8.17	VLSSR
5	SAO 124059	18 55 47.40	+04 59 38.76	8.45	SAO
	PPM 166820	18 55 47.42	+04 59 39.12	8.46	PPM
6	NVSS J185452+050239	18 54 52.20	+05 02 39.84	8.46	NVSS
	BD+04 3912	18 55 47.45	+04 59 39.48	8.46	ACRS
7	NVSS J185442+050144	18 54 42.91	+05 01 45.12	9.70	NVSS
8	NVSS J185542+050430	18 55 42.00	+05 04 30.00	10.28	NVSS
	[WBH2005] G37.935+1.368	18 55 41.90	+05 04 33.96	10.31	WBHGP20CM
	[WBH2005] G37.812+1.584	18 54 41.90	+05 03 54.00	11.19	WBHGP20CM
9	NVSS J185441+050354	18 54 41.81	+05 03 54.00	11.22	NVSS
10	[SPT2015] VLA J1855+0450	18 55 54.60	+04 50 34.08	11.37	FER2FUSRID
	[PME2013] J1855+0450	18 55 54.70	+04 50 35.16	11.38	AT2FGLUS
	QORG J185500.0+050754	18 55 00.00	+05 07 54.12	12.00	QORGCAT
11	NVSS J185459+050757	18 54 59.71	+05 07 58.08	12.08	NVSS
	[WBH2005] G37.908+1.548	18 55 00.31	+05 08 02.04	12.10	WBHGP20CM
12	TXS 1852+050	18 55 25.61	+05 08 29.04	12.17	TEXAS
	[WBH2005] G37.562+1.439	18 54 45.70	+04 46 36.84	12.47	WBHGP20CM
13	NVSS J185445+044633	18 54 45.79	+04 46 32.88	12.50	NVSS
14	ADG037.6+01.5	18 54 32.30	+04 50 08.88	12.59	DIXON
15	VLSSr J185544.5+050734	18 55 44.50	+05 07 35.04	13.14	VLSSR