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Home > Einstein Probe follow up > EP#01709177494

EP_FIELD00040

EP

40

/EP

EP#01709177494: Swift observation summary

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.

• 19841 — 2.0 ks of cleaned data taken between 2025-05-31 01:52:50 and 2025-05-31 03:30:31

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]	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	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
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

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.

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Exposure map

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FITS exposure map.