EP250302a: Swift observation summary

Mission:	Einstein Probe/WXT
Einstein Probe RA:	169.508°
Einstein Probe Dec:	+33.557°
Einstein Probe Err:	3.0 arcmin
T0:	2025-03-02 15:36:04 UT
Galactic:	189.51° +68.90°
Galactic N_H:	2.31× 10²⁰ cm^-2

Sun distance:	152.92°
Sun angle:	11.59 [hr](West of Sun)
Moon distance:	130.80°
Visibility of this field.
First slew:	2025-03-02 16:34:35 UT
First observation:	2025-03-02 16:34:00 UT
First analysis:	2025-03-02 18:36:45 UT

Data analysed so far:

ObsID: 00019585001 with 1.0 ks exposure.
ObsID: 00019585002 with 2.3 ks exposure.
ObsID: 00019585003 with 1.2 ks exposure.

About tiled field analysis.

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

19585 — 4.5 ks of cleaned data taken between 2025-03-02 16:34:29 and 2025-03-04 10:28:26

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]	11h 18m 03.62s169.51508°	+33° 35′ 09.0″33.58584°	2.5′′ ^*	Good	2 (O)	1.8′	13.5 ks	The source is fading with 4.4-σ significance. The source is 4.4-σ above the LSPXS limit.
Mean XRT rate: 8.1 (±0.5) ×10^-2 ct s^-1 Peak XRT rate: 1.7 (±0.4) ct s^-1 RASS PSPC 3-σ upper limit: 0.07 ct s^-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 0.108 (±0.006) ct s^-1 Peak XRT rate converted to PSPC: 2.3 (±0.5) ct s^-1 Mean XRT flux: 2.96 (±0.17) ×10^-12 erg cm^-1s^-1 Peak XRT flux: 6.4 (±1.4) ×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 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]	11h 18m 03.62s169.51508°	+33° 35′ 09.0″33.58584°	2.5′′ ^*	Good	2 (O)	1.8′	13.5 ks	The source is fading with 4.4-σ significance. The source is 4.4-σ above the LSPXS limit.
Mean XRT rate: 8.1 (±0.5) ×10^-2 ct s^-1 Peak XRT rate: 1.7 (±0.4) ct s^-1 RASS PSPC 3-σ upper limit: 0.07 ct s^-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 0.108 (±0.006) ct s^-1 Peak XRT rate converted to PSPC: 2.3 (±0.5) ct s^-1 Mean XRT flux: 2.96 (±0.17) ×10^-12 erg cm^-1s^-1 Peak XRT flux: 6.4 (±1.4) ×10^-11 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position
2 [details]	11h 18m 20.90s169.58708°	+33° 33′ 53.9″33.56498°	5.4′′ ^*	Good	3 (U)	4.0′	13.5 ks	Matches SIMBAD source: SDSS J111820.60+333355.3, 4.1″ away.
Mean XRT rate: 3.3 (+0.9, -0.7) ×10^-3 ct s^-1 Peak XRT rate: 5.3 (+1.9, -1.5) ×10^-3 ct s^-1 RASS PSPC 3-σ upper limit: 0.09 ct s^-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 3.86 (+1.09, -0.87) ×10^-3 ct s^-1 Peak XRT rate converted to PSPC: 6.2 (+2.2, -1.8) ×10^-3 ct s^-1 Mean XRT flux: 1.23 (+0.35, -0.28) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 2.0 (+0.7, -0.6) ×10^-13 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position
3 [details]	11h 18m 01.07s169.50448°	+33° 23′ 14.9″33.38747°	6.0′′	Good	3 (U)	10.2′	11.5 ks
Mean XRT rate: 3.3 (+0.9, -0.6) ×10^-3 ct s^-1 Peak XRT rate: 6.4 (+4.0, -2.8) ×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: 4.27 (+1.14, -0.83) ×10^-3 ct s^-1 Peak XRT rate converted to PSPC: 8 (+5, -4) ×10^-3 ct s^-1 Mean XRT flux: 1.30 (+0.35, -0.25) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 2.5 (+1.6, -1.1) ×10^-13 erg cm^-1s^-1 Products: Light curve \| Spectrum
4 [details]	11h 18m 11.60s169.54833°	+33° 45′ 10.6″33.75294°	4.2′′ ^*	Good	3 (U)	11.9′	11.6 ks
Mean XRT rate: 5.15 (+1.15, -0.92) ×10^-3 ct s^-1 Peak XRT rate: 6.2 (+2.0, -1.7) ×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: 7.4 (+1.6, -1.3) ×10^-3 ct s^-1 Peak XRT rate converted to PSPC: 8.9 (+2.9, -2.4) ×10^-3 ct s^-1 Mean XRT flux: 1.9 (+0.4, -0.3) ×10^-13 erg cm^-1s^-1 Peak XRT flux: 2.3 (+0.8, -0.6) ×10^-13 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position

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FITS exposure map.