EP#01709179435: Swift observation summary

Mission:	Einstein Probe/WXT
Einstein Probe RA:	325.668°
Einstein Probe Dec:	+43.576°
Einstein Probe Err:	3.0 arcmin
T0:	2025-06-27 03:38:47 UT
Galactic:	90.55° -7.11°
Galactic N_H:	2.55× 10²¹ cm^-2

Sun distance:	99.01°
Sun angle:	8.69 [hr] (West of Sun)
Moon distance:	108.38°
Visibility of this field.

Data analysed so far:

ObsID: 00019898001 with 1.7 ks exposure.

About tiled field analysis.

So far 1 fields have been scheduled for observations. Data are available and processed for 1 of these.

1 fields were processed but not included in the analysis. This is because, after standard processing and the removal of times contaminated by light reflected off the bright Earth, there was too little data (<100 s) for source detection to be performed.

Details of afterglow candidates

1 sources were found which matches the afterglow criteria.

#	RA (J2000)	Dec (J2000)	Err₉₀¹	Detection Flag²	Rank³	Dist from Einstein Probe/WXT pos	Exposure	Notes	Vizier
1 [details]	21h 42m 43.02s325.67927°	+43° 35′ 09.8″43.58606°	2.5′′ ^*	Good	2 (O)	0.8′	1.7 ks	This source may be affected by optical loading Matches SIMBAD source: V* SS Cyg, 1.9″ away. Matches known X-ray source: LSXPS J214243.0+433511 (from LSXPS), 0.7″ away.
Mean XRT rate: 12.48 (±0.29) ct s^-1 Peak XRT rate: 25 (±5) ct s^-1 -4.83 σ above the catalogued flux from LSXPS. RASS PSPC 3-σ upper limit: 0.0×10⁰ ct s^-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 12.29 (±0.29) ct s^-1 Peak XRT rate converted to PSPC: 25 (±5) ct s^-1 Mean XRT flux: 5.85 (±0.14) ×10^-10 erg cm^-1s^-1 Peak XRT flux: 1.19 (±0.22) ×10^-9 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position

¹ Radius, 90% confidence.
² Indicates how likely the source is to be real. See the LSXPS documentation.
³ T=Transient Source, O=Outbursting known source, U=Uncatalogued X-ray source, K=Known X-ray source.
^* The position was enhanced using astrometry derived from the Swift UVOT.
^† The position was astrometrically corrected using the XRT sources and the 2MASS catalogue.

Find an upper limit.

Sources found so far

So far 3 sources have been found in the XRT data. 3 sources match catalogued sources.

#	RA (J2000)	Dec (J2000)	Err₉₀¹	Detection Flag²	Rank³	Dist from Einstein Probe/WXT pos	Exposure	Notes
1 [details]	21h 42m 43.02s325.67927°	+43° 35′ 09.8″43.58606°	2.5′′ ^*	Good	2 (O)	0.8′	1.7 ks	This source may be affected by optical loading Matches SIMBAD source: V* SS Cyg, 1.9″ away. Matches known X-ray source: LSXPS J214243.0+433511 (from LSXPS), 0.7″ away.
Mean XRT rate: 12.48 (±0.29) ct s^-1 Peak XRT rate: 25 (±5) ct s^-1 -4.83 σ above the catalogued flux from LSXPS. RASS PSPC 3-σ upper limit: 0.0×10⁰ ct s^-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 12.29 (±0.29) ct s^-1 Peak XRT rate converted to PSPC: 25 (±5) ct s^-1 Mean XRT flux: 5.85 (±0.14) ×10^-10 erg cm^-1s^-1 Peak XRT flux: 1.19 (±0.22) ×10^-9 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position
2 [details]	21h 43m 45.59s325.93997°	+43° 35′ 02.3″43.58398°	11.4′′ ^*	Good	4 (K)	11.8′	1.7 ks	Matches SIMBAD source: ZTF J214344.14+433506.5, 21.9″ away. Matches known X-ray source: LSXPS J214346.5+433458 (from LSXPS), 5.7″ away.
Mean XRT rate: 7.3 (+3.4, -2.6) ×10^-3 ct s^-1 Peak XRT rate: 7.3 (+3.4, -2.6) ×10^-3 ct s^-1 -1.41 σ above the catalogued flux from LSXPS. RASS PSPC 3-σ upper limit: 0.0×10⁰ ct s^-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 6.2 (+2.9, -2.3) ×10^-3 ct s^-1 Peak XRT rate converted to PSPC: 6.2 (+2.9, -2.3) ×10^-3 ct s^-1 Mean XRT flux: 1.9 (+0.9, -0.7) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 1.9 (+0.9, -0.7) ×10^-13 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position
3 [details]	21h 42m 54.43s325.72679°	+43° 41′ 52.0″43.69779°	6.0′′ ^*	Good	4 (K)	7.7′	1.7 ks	Matches SIMBAD source: Gaia DR3 1972982463963913344, 4.7″ away. Matches known X-ray source: LSXPS J214254.8+434152 (from LSXPS), 3.2″ away.
Mean XRT rate: undetermined ct s^-1 Peak XRT rate: undetermined ct s^-1 -2.24 σ above the catalogued flux from LSXPS. RASS PSPC 3-σ upper limit: 0.0×10⁰ ct s^-1 (PSPC count-rate) Mean XRT rate converted to PSPC: undetermined ct s^-1 Peak XRT rate converted to PSPC: undetermined ct s^-1 Mean XRT flux: undetermined erg cm^-1s^-1 Peak XRT flux: undetermined erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position

Image

Select image style: Draggable PNG | JS9.

Magnify image and make scrollable?

FITS image.

Exposure map

Magnify exposure map and make scrollable?

FITS exposure map.