EP#01709177873: Swift observation summary

Mission:	Einstein Probe/WXT
Einstein Probe RA:	238.239°
Einstein Probe Dec:	+44.957°
Einstein Probe Err:	3.1 arcmin
T0:	2025-06-05 18:51:47 UT
Galactic:	71.54° +49.87°
Galactic N_H:	1.30× 10²⁰ cm^-2

Sun distance:	110.99°
Sun angle:	10.96 [hr] (East of Sun)
Moon distance:	66.45°
Visibility of this field.

Data analysed so far:

ObsID: 00019855001 with 2.0 ks exposure.

About tiled field analysis.

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

19855 — 2.0 ks of cleaned data taken between 2025-06-05 20:25:31 and 2025-06-05 22:17:50

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]	15h 53m 04.55s238.26897°	+44° 57′ 46.8″44.96301°	2.5′′ ^*	Good	2 (O)	1.3′	2.0 ks	Matches SIMBAD source: RX J1553.0+4457, 3.1″ away. Matches known X-ray source: XMMSL3 J155304.3+445748 (from XMM-NEWTON/XMMSLEWCLN), 3.3593357439391″ away.
Mean XRT rate: 1.04 (±0.03) ct s^-1 Peak XRT rate: 1.8 (±0.4) ct s^-1 -4.20 σ above the catalogued flux from XMM-NEWTON/XMMSLEWCLN. RASS PSPC 3-σ upper limit: 0.0×10⁰ ct s^-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 1.40 (±0.05) ct s^-1 Peak XRT rate converted to PSPC: 2.4 (±0.5) ct s^-1 Mean XRT flux: 3.46 (±0.11) ×10^-11 erg cm^-1s^-1 Peak XRT flux: 5.9 (±1.3) ×10^-11 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 2 sources have been found in the XRT data. 2 sources match catalogued sources.

#	RA (J2000)	Dec (J2000)	Err₉₀¹	Detection Flag²	Rank³	Dist from Einstein Probe/WXT pos	Exposure	Notes
1 [details]	15h 53m 04.55s238.26897°	+44° 57′ 46.8″44.96301°	2.5′′ ^*	Good	2 (O)	1.3′	2.0 ks	Matches SIMBAD source: RX J1553.0+4457, 3.1″ away. Matches known X-ray source: XMMSL3 J155304.3+445748 (from XMM-NEWTON/XMMSLEWCLN), 3.3593357439391″ away.
Mean XRT rate: 1.04 (±0.03) ct s^-1 Peak XRT rate: 1.8 (±0.4) ct s^-1 -4.20 σ above the catalogued flux from XMM-NEWTON/XMMSLEWCLN. RASS PSPC 3-σ upper limit: 0.0×10⁰ ct s^-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 1.40 (±0.05) ct s^-1 Peak XRT rate converted to PSPC: 2.4 (±0.5) ct s^-1 Mean XRT flux: 3.46 (±0.11) ×10^-11 erg cm^-1s^-1 Peak XRT flux: 5.9 (±1.3) ×10^-11 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position
2 [details]	15h 53m 58.53s238.49386°	+44° 59′ 23.7″44.98991°	6.2′′	Good	3 (U)	11.0′	2.0 ks	Matches SIMBAD source: SDSS J155358.58+445923.6, 0.6″ away.
Mean XRT rate: 8.4 (+3.4, -2.7) ×10^-3 ct s^-1 Peak XRT rate: 8.4 (+3.4, -2.7) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.27 ct s^-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 1.0 (+0.4, -0.3) ×10^-3 ct s^-1 Peak XRT rate converted to PSPC: 1.0 (+0.4, -0.3) ×10^-3 ct s^-1 Mean XRT flux: 3.05 (+1.25, -0.99) ×10^-11 erg cm^-1s^-1 Peak XRT flux: 3.05 (+1.25, -0.99) ×10^-11 erg cm^-1s^-1 Products: Light curve \| Spectrum

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Exposure map

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FITS exposure map.