EP250903a: Swift observation summary

Mission:	Einstein Probe/WXT
Einstein Probe RA:	339.120°
Einstein Probe Dec:	-49.863°
Einstein Probe Err:	3.1 arcmin
T0:	2025-09-03 14:03:01 UT
Galactic:	342.33° -55.66°
Galactic N_H:	1.13× 10²⁰ cm^-2

Sun distance:	137.50°
Sun angle:	11.78 [hr] (East of Sun)
Moon distance:	43.42°
Visibility of this field.

Data analysed so far:

ObsID: 03000069001 with 1.7 ks exposure.
ObsID: 03000069002 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.

3000069 — 3.7 ks of cleaned data taken between 2025-09-03 14:24:58 and 2025-09-03 23:54:02

Find an upper limit.

Sources found so far

So far 4 sources have been found in the XRT data. 1 sources match catalogued sources.

#	RA (J2000)	Dec (J2000)	Err₉₀¹	Detection Flag²	Rank³	Dist from Einstein Probe/WXT pos	Exposure	Notes
1 [details]	22h 35m 22.73s338.84473°	-49° 52′ 42.6″-49.87849°	5.4′′	Good	4 (K)	10.7′	7.4 ks	Matches SIMBAD source: 2MASS J22352261-4952413, 1.8″ away. Matches known X-ray source: XMMSL3 J223522.9-495238 (from XMM-NEWTON/XMMSLEWCLN), 4.709522812676″ away.
Mean XRT rate: 1.16 (±0.18) ×10^-2 ct s^-1 Peak XRT rate: 1.46 (±0.30) ×10^-2 ct s^-1 1.66 σ below 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: 0.022 (±0.003) ct s^-1 Peak XRT rate converted to PSPC: 0.028 (±0.006) ×10^-2 ct s^-1 Mean XRT flux: 1.83 (±0.28) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 2.3 (±0.5) ×10^-13 erg cm^-1s^-1 Products: Light curve \| Spectrum
2 [details]	22h 36m 27.22s339.11342°	-49° 51′ 15.2″-49.85422°	6.7′′ ^*	Good	3 (U)	0.6′	7.4 ks
Mean XRT rate: 3.8 (+1.4, -1.2) ×10^-3 ct s^-1 Peak XRT rate: 3.8 (+1.4, -1.2) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.05 ct s^-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 4.6 (+1.7, -1.4) ×10^-3 ct s^-1 Peak XRT rate converted to PSPC: 4.6 (+1.7, -1.4) ×10^-3 ct s^-1 Mean XRT flux: 2.3 (+0.9, -0.7) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 2.3 (+0.9, -0.7) ×10^-13 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position
3 [details]	22h 37m 38.30s339.40957°	-49° 47′ 59.0″-49.79973°	7.0′′	Good	3 (U)	11.8′	3.5 ks
Mean XRT rate: 6.3 (+2.4, -1.7) ×10^-3 ct s^-1 Peak XRT rate: 7.0 (+3.1, -2.4) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.05 ct s^-1 (PSPC count-rate) Products: Light curve \| Spectrum
4 [details]	22h 36m 03.21s339.01339°	-49° 48′ 52.3″-49.81453°	7.5′′	Poor	3 (U)	5.0′	7.4 ks
Mean XRT rate: undetermined ct s^-1 Peak XRT rate: undetermined ct s^-1 RASS PSPC 3-σ upper limit: 0.02 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

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.

Image

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FITS image.

Exposure map

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FITS exposure map.