EP#01709177494: Swift observation summary

Mission:	Einstein Probe/WXT
Einstein Probe RA:	257.382°
Einstein Probe Dec:	-26.652°
Einstein Probe Err:	3.0 arcmin
T0:	2025-05-31 01:46:22 UT
Galactic:	357.48° +7.91°
Galactic N_H:	2.07× 10²¹ cm^-2

Sun distance:	170.10°
Sun angle:	11.36 [hr] (West of Sun)
Moon distance:	136.05°
Visibility of this field.
First slew:	2025-05-31 01:52:52 UT
First observation:	2025-05-31 01:52:20 UT
First analysis:	2025-05-31 06:26:05 UT

Data analysed so far:

ObsID: 00019841001 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.

1 fields were processed but not included in the analysis. This is because, after standard processing and the removal of times contaminated by light reflected off the bright Earth, there was too little data (<100 s) for source detection to be performed.

Details of afterglow candidates

1 sources were found which matches the afterglow criteria.

#	RA (J2000)	Dec (J2000)	Err₉₀¹	Detection Flag²	Rank³	Exposure	Notes	Vizier
1 [details]	17h 09m 30.30s257.37624°	-26° 39′ 19.1″-26.65531°	2.5′′ ^*	Good	2 (O)	0.4′	2.0 ks	Matches SIMBAD source: RX J1709.5-2639, 8.3″ away. Matches known X-ray source: LSXPS J170930.1-263918 (from LSXPS), 3.2″ away.
Mean XRT rate: 11.35 (±0.22) ct s^-1 Peak XRT rate: 19 (±3) ct s^-1 -5.73 σ above the catalogued flux from LSXPS. RASS PSPC 3-σ upper limit: 0.0×10⁰ ct s^-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 12.34 (±0.23) ct s^-1 Peak XRT rate converted to PSPC: 20 (±3) ct s^-1 Mean XRT flux: 4.66 (±0.09) ×10^-10 erg cm^-1s^-1 Peak XRT flux: 7.7 (±1.3) ×10^-10 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]	17h 09m 30.30s257.37624°	-26° 39′ 19.1″-26.65531°	2.5′′ ^*	Good	2 (O)	0.4′	2.0 ks	Matches SIMBAD source: RX J1709.5-2639, 8.3″ away. Matches known X-ray source: LSXPS J170930.1-263918 (from LSXPS), 3.2″ away.
Mean XRT rate: 11.35 (±0.22) ct s^-1 Peak XRT rate: 19 (±3) ct s^-1 -5.73 σ above the catalogued flux from LSXPS. RASS PSPC 3-σ upper limit: 0.0×10⁰ ct s^-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 12.34 (±0.23) ct s^-1 Peak XRT rate converted to PSPC: 20 (±3) ct s^-1 Mean XRT flux: 4.66 (±0.09) ×10^-10 erg cm^-1s^-1 Peak XRT flux: 7.7 (±1.3) ×10^-10 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position
2 [details]	17h 09m 09.08s257.28782°	-26° 42′ 15.9″-26.70442°	6.7′′	Poor	4 (K)	5.9′	2.0 ks	Matches SIMBAD source: AT20G J170909-264219, 3.3″ away. Matches known X-ray source: LSXPS J170909.1-264216 (from LSXPS), 0.9″ away.
Mean XRT rate: undetermined ct s^-1 Peak XRT rate: undetermined ct s^-1 0.71 σ below the catalogued flux from LSXPS. RASS PSPC 3-σ upper limit: 0.0×10⁰ ct s^-1 (PSPC count-rate) Products: Light curve

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Exposure map

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FITS exposure map.