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Home > Einstein Probe follow up > EP#01709319842

EP_FIELD00090

EP

90

/EP

EP#01709319842: Swift observation summary

Data analysed so far:

• ObsID: 00021914001 with 1.9 ks exposure.

About tiled field analysis.

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

• 21914 — 1.9 ks of cleaned data taken between 2026-09-23 21:19:37 and 2026-09-23 23:04:57

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]	04h 42m 28.85s70.62022°	-26° 13′ 47.0″-26.22973°	2.6′′ *	Good	2 (O)	3.0′	1.9 ks	Matches SIMBAD source: UNSW-V 022, 5.6″ away. Matches known X-ray source: 1RXS J044229.1-261341 (from ROSAT/RASSFSC), 9.901056321778″ away.
Mean XRT rate: 0.292 (±0.014) ct s-1 Peak XRT rate: 0.55 (±0.12) ct s-1 -4.07 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: 0.467 (±0.023) ct s-1 Peak XRT rate converted to PSPC: 0.88 (±0.20) ct s-1 Mean XRT flux: 7.0 (±0.3) ×10-12 erg cm-1s-1 Peak XRT flux: 1.32 (±0.30) ×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 3 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]	04h 42m 28.85s70.62022°	-26° 13′ 47.0″-26.22973°	2.6′′ *	Good	2 (O)	3.0′	1.9 ks	Matches SIMBAD source: UNSW-V 022, 5.6″ away. Matches known X-ray source: 1RXS J044229.1-261341 (from ROSAT/RASSFSC), 9.901056321778″ away.
Mean XRT rate: 0.292 (±0.014) ct s-1 Peak XRT rate: 0.55 (±0.12) ct s-1 -4.07 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: 0.467 (±0.023) ct s-1 Peak XRT rate converted to PSPC: 0.88 (±0.20) ct s-1 Mean XRT flux: 7.0 (±0.3) ×10-12 erg cm-1s-1 Peak XRT flux: 1.32 (±0.30) ×10-11 erg cm-1s-1 Products: Light curve | Spectrum | Enhanced position
2 [details]	04h 43m 16.83s70.82012°	-26° 18′ 51.3″-26.31424°	7.3′′	Good	3 (U)	10.5′	1.9 ks	Matches SIMBAD source: LEDA 769185, 7.7″ away.
Mean XRT rate: 6.1 (+2.8, -2.2) ×10-3 ct s-1 Peak XRT rate: 6.1 (+2.8, -2.2) ×10-3 ct s-1 RASS PSPC 3-σ upper limit: 0.14 ct s-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 3.9 (+1.8, -1.4) ×10-3 ct s-1 Peak XRT rate converted to PSPC: 3.9 (+1.8, -1.4) ×10-3 ct s-1 Mean XRT flux: 7.0 (+3.2, -2.5) ×10-13 erg cm-1s-1 Peak XRT flux: 7.0 (+3.2, -2.5) ×10-13 erg cm-1s-1 Products: Light curve | Spectrum
3 [details]	04h 42m 34.32s70.64299°	-26° 10′ 52.0″-26.18112°	6.6′′	Poor	3 (U)	2.0′	0 s
Mean XRT rate: undetermined ct s-1 Peak XRT rate: undetermined ct s-1 RASS PSPC 3-σ upper limit: 0.04 ct s-1 (PSPC count-rate)

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.