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Home > Einstein Probe follow up > EP#01709179071

EP_FIELD00049

EP

49

/EP

EP#01709179071: Swift observation summary

Data analysed so far:

• ObsID: 00019887001 with 2.3 ks exposure.

About tiled field analysis.

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

• 19887 — 2.3 ks of cleaned data taken between 2025-06-20 20:49:24 and 2025-06-20 22:40:09

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]	21h 37m 08.85s324.28686°	-60° 36′ 06.5″-60.60180°	3.0′′ *	Good	2 (O)	0.6′	2.3 ks	Matches SIMBAD source: 2MASS J21370885-6036054, 2″ away. Matches known X-ray source: LSXPS J213708.3-603607 (from LSXPS), 2.3″ away.
Mean XRT rate: 9.7 (+0.9, -0.8) ×10-2 ct s-1 Peak XRT rate: 0.123 (±0.028) ct s-1 -3.25 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: 0.160 (±0.014) ct s-1 Peak XRT rate converted to PSPC: 0.20 (±0.05) ct s-1 Mean XRT flux: 2.27 (±0.20) ×10-12 erg cm-1s-1 Peak XRT flux: 2.9 (±0.6) ×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. 2 sources match catalogued sources.

#	RA (J2000)	Dec (J2000)	Err901	Detection Flag2	Rank3	Dist from Einstein Probe/WXT pos	Exposure	Notes	Vizier
1 [details]	21h 37m 08.85s324.28686°	-60° 36′ 06.5″-60.60180°	3.0′′ *	Good	2 (O)	0.6′	2.3 ks	Matches SIMBAD source: 2MASS J21370885-6036054, 2″ away. Matches known X-ray source: LSXPS J213708.3-603607 (from LSXPS), 2.3″ away.
Mean XRT rate: 9.7 (+0.9, -0.8) ×10-2 ct s-1 Peak XRT rate: 0.123 (±0.028) ct s-1 -3.25 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: 0.160 (±0.014) ct s-1 Peak XRT rate converted to PSPC: 0.20 (±0.05) ct s-1 Mean XRT flux: 2.27 (±0.20) ×10-12 erg cm-1s-1 Peak XRT flux: 2.9 (±0.6) ×10-12 erg cm-1s-1 Products: Light curve | Spectrum | Enhanced position
2 [details]	21h 35m 49.87s323.95781°	-60° 41′ 41.9″-60.69496°	5.3′′ *	Good	4 (K)	11.1′	2.3 ks	Matches known X-ray source: LSXPS J213549.5-604140 (from LSXPS), 2.7″ away.
Mean XRT rate: 7.4 (+3.2, -2.5) ×10-3 ct s-1 Peak XRT rate: 7.4 (+3.2, -2.5) ×10-3 ct s-1 -1.64 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: 3.7 (+1.6, -1.2) ×10-3 ct s-1 Peak XRT rate converted to PSPC: 3.7 (+1.6, -1.2) ×10-3 ct s-1 Mean XRT flux: 5.2 (+2.2, -1.8) ×10-13 erg cm-1s-1 Peak XRT flux: 5.2 (+2.2, -1.8) ×10-13 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.

Image

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FITS image.

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Exposure map

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FITS exposure map.