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Home > Einstein Probe follow up > EP250228a

EP_FIELD00021

EP

21

/EP

EP250228a: Swift observation summary

Data analysed so far:

• ObsID: 00019581001 with 0.4 ks exposure.

About tiled field analysis.

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

• 19581 — 353 s of cleaned data taken between 2025-02-28 05:50:41 and 2025-02-28 05:58:29

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]	06h 54m 25.33s103.60555°	-41° 34′ 18.7″-41.57187°	3.6′′ *	Good	2 (O)	0.6′	353 s	The source is 3.9-σ above the RASS limit.
Mean XRT rate: 0.179 (±0.028) ct s-1 Peak XRT rate: 0.23 (±0.05) ct s-1 RASS PSPC 3-σ upper limit: 0.04 ct s-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 0.25 (±0.04) ct s-1 Peak XRT rate converted to PSPC: 0.32 (±0.07) ct s-1 Mean XRT flux: 5.4 (±0.8) ×10-12 erg cm-1s-1 Peak XRT flux: 7.0 (±1.5) ×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 1 sources have been found in the XRT data. 0 sources match catalogued sources.

#	RA (J2000)	Dec (J2000)	Err901	Detection Flag2	Rank3	Dist from Einstein Probe/WXT pos	Exposure	Notes	Vizier
1 [details]	06h 54m 25.33s103.60555°	-41° 34′ 18.7″-41.57187°	3.6′′ *	Good	2 (O)	0.6′	353 s	The source is 3.9-σ above the RASS limit.
Mean XRT rate: 0.179 (±0.028) ct s-1 Peak XRT rate: 0.23 (±0.05) ct s-1 RASS PSPC 3-σ upper limit: 0.04 ct s-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 0.25 (±0.04) ct s-1 Peak XRT rate converted to PSPC: 0.32 (±0.07) ct s-1 Mean XRT flux: 5.4 (±0.8) ×10-12 erg cm-1s-1 Peak XRT flux: 7.0 (±1.5) ×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.

Image

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FITS image.

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Exposure map

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FITS exposure map.