EP250223a: Swift observation summary

Mission:	Einstein Probe/WXT
Einstein Probe RA:	98.258°
Einstein Probe Dec:	-22.432°
Einstein Probe Err:	3.1 arcmin
T0:	2025-02-23 15:04:35 UT
Galactic:	231.29° -13.89°
Galactic N_H:	1.02× 10²¹ cm^-2

Sun distance:	114.32°
Sun angle:	8.1 [hr](East of Sun)
Moon distance:	129.23°
Visibility of this field.
First slew:	2025-02-23 16:36:15 UT
First observation:	2025-02-23 16:35:43 UT
First analysis:	2025-02-23 21:12:14 UT

Data analysed so far:

ObsID: 00019570001 with 1.5 ks exposure.

About tiled field analysis.

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

19570 — 1.5 ks of cleaned data taken between 2025-02-23 16:36:13 and 2025-02-23 17:02:33

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]	06h 33m 05.50s98.27293°	-22° 26′ 46.6″-22.44627°	6.8′′ ^*	Good	2 (O)	1.2′	6.0 ks	The source is fading with 4.0-σ significance. The source is 4.3-σ above the LSPXS limit.
Mean XRT rate: 2.97 (+0.26, -0.25) ×10^-2 ct s^-1 Peak XRT rate: 0.14 (±0.03) ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 0.039 (±0.003) ct s^-1 Peak XRT rate converted to PSPC: 0.19 (±0.04) ct s^-1 Mean XRT flux: 9.5 (±0.8) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 4.6 (±1.0) ×10^-12 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. 1 sources match catalogued sources.

#	RA (J2000)	Dec (J2000)	Err₉₀¹	Detection Flag²	Rank³	Dist from Einstein Probe/WXT pos	Exposure	Notes
1 [details]	06h 33m 05.50s98.27293°	-22° 26′ 46.6″-22.44627°	6.8′′ ^*	Good	2 (O)	1.2′	6.0 ks	The source is fading with 4.0-σ significance. The source is 4.3-σ above the LSPXS limit.
Mean XRT rate: 2.97 (+0.26, -0.25) ×10^-2 ct s^-1 Peak XRT rate: 0.14 (±0.03) ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 0.039 (±0.003) ct s^-1 Peak XRT rate converted to PSPC: 0.19 (±0.04) ct s^-1 Mean XRT flux: 9.5 (±0.8) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 4.6 (±1.0) ×10^-12 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position
2 [details]	06h 33m 26.94s98.36223°	-22° 23′ 24.7″-22.39020°	4.7′′ ^*	Good	3 (U)	6.3′	6.0 ks	Matches SIMBAD source: ICRF J063326.7-222322, 3.2″ away.
Mean XRT rate: 9.2 (+1.8, -1.5) ×10^-3 ct s^-1 Peak XRT rate: 1.13 (±0.28) ×10^-2 ct s^-1 RASS PSPC 3-σ upper limit: 0.04 ct s^-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 0.0103 (+0.0020, -0.0017) ×10^-2 ct s^-1 Peak XRT rate converted to PSPC: 0.013 (±0.003) ×10^-2 ct s^-1 Mean XRT flux: 2.5 (+0.5, -0.4) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 3.1 (±0.8) ×10^-13 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position

Image

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Exposure map

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FITS exposure map.