EP250901a: Swift observation summary

Mission:	Einstein Probe/WXT
Einstein Probe RA:	273.025°
Einstein Probe Dec:	+18.676°
Einstein Probe Err:	3.2 arcmin
T0:	2025-09-01 12:05:03 UT
Galactic:	45.68° +16.86°
Galactic N_H:	8.08× 10²⁰ cm^-2

Sun distance:	108.22°
Sun angle:	7.49 [hr] (East of Sun)
Moon distance:	48.42°
Visibility of this field.

Data analysed so far:

ObsID: 03000063001 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.

3000063 — 2.0 ks of cleaned data taken between 2025-09-01 13:47:44 and 2025-09-01 15:30:34

Find an upper limit.

Sources found so far

So far 3 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]	18h 12m 10.86s273.04527°	+18° 42′ 17.2″18.70477°	5.0′′ ^*	Good	4 (K)	2.1′	2.0 ks	Matches SIMBAD source: 1RXS J181210.7+184228, 12.4″ away. Matches known X-ray source: 1RXS J181210.7+184228 (from ROSAT/RASSFSC), 12.368249383193″ away.
Mean XRT rate: 5.7 (±1.0) ×10^-2 ct s^-1 Peak XRT rate: 6.1 (±1.5) ×10^-2 ct s^-1 -2.51 σ above the catalogued flux from ROSAT/RASSFSC. RASS PSPC 3-σ upper limit: 0.0×10⁰ ct s^-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 0.068 (±0.012) ct s^-1 Peak XRT rate converted to PSPC: 0.073 (±0.018) ×10^-2 ct s^-1 Mean XRT flux: 2.1 (+0.4, -0.3) ×10^-12 erg cm^-1s^-1 Peak XRT flux: 2.2 (±0.5) ×10^-12 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position
2 [details]	18h 11m 47.61s272.94839°	+18° 50′ 26.9″18.84081°	6.8′′	Good	3 (U)	10.8′	2.0 ks
Mean XRT rate: 4.7 (+2.5, -1.9) ×10^-3 ct s^-1 Peak XRT rate: 4.7 (+2.5, -1.9) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 8 (+4, -3) ×10^-3 ct s^-1 Peak XRT rate converted to PSPC: 8 (+4, -3) ×10^-3 ct s^-1 Mean XRT flux: 8 (+4, -3) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 8 (+4, -3) ×10^-14 erg cm^-1s^-1 Products: Light curve \| Spectrum
3 [details]	18h 12m 42.41s273.17671°	+18° 41′ 46.2″18.69616°	6.2′′	Poor	3 (U)	8.7′	2.0 ks
Mean XRT rate: 4.2 (+2.3, -1.7) ×10^-3 ct s^-1 Peak XRT rate: 4.2 (+2.3, -1.7) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 4.2 (+2.3, -1.7) ×10^-3 ct s^-1 Peak XRT rate converted to PSPC: 4.2 (+2.3, -1.7) ×10^-3 ct s^-1 Mean XRT flux: 9 (+5, -4) ×10^-14 erg cm^-1s^-1 Peak XRT flux: 9 (+5, -4) ×10^-14 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.