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.

19898 — 1.7 ks of cleaned data taken between 2025-06-27 04:21:18 and 2025-06-27 06:09:40

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

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FITS exposure map.