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Home > Einstein Probe follow up > EP250610a

EP_FIELD00045

EP

45

/EP

EP250610a: Swift observation summary

Data analysed so far:

• ObsID: 00019862001 with 2.1 ks exposure.
• ObsID: 00019862002 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.

• 19862 — 4.0 ks of cleaned data taken between 2025-06-10 05:12:43 and 2025-06-10 15:53:27

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]	16h 33m 25.36s248.35565°	+38° 32′ 01.1″38.53363°	4.1′′ *	Good	2 (O)	2.2′	4.0 ks	The source is 3.1-σ above the LSPXS limit.
Mean XRT rate: 8.3 (+2.2, -1.9) ×10-3 ct s-1 Peak XRT rate: 1.11 (±0.27) ×10-2 ct s-1 RASS PSPC 3-σ upper limit: 0.01 ct s-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 0.016 (±0.004) ×10-2 ct s-1 Peak XRT rate converted to PSPC: 0.021 (±0.005) ×10-2 ct s-1 Mean XRT flux: 3.7 (+1.0, -0.8) ×10-13 erg cm-1s-1 Peak XRT flux: 4.9 (±1.2) ×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.

Find an upper limit.

Sources found so far

So far 4 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]	16h 33m 25.36s248.35565°	+38° 32′ 01.1″38.53363°	4.1′′ *	Good	2 (O)	2.2′	4.0 ks	The source is 3.1-σ above the LSPXS limit.
Mean XRT rate: 8.3 (+2.2, -1.9) ×10-3 ct s-1 Peak XRT rate: 1.11 (±0.27) ×10-2 ct s-1 RASS PSPC 3-σ upper limit: 0.01 ct s-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 0.016 (±0.004) ×10-2 ct s-1 Peak XRT rate converted to PSPC: 0.021 (±0.005) ×10-2 ct s-1 Mean XRT flux: 3.7 (+1.0, -0.8) ×10-13 erg cm-1s-1 Peak XRT flux: 4.9 (±1.2) ×10-13 erg cm-1s-1 Products: Light curve | Spectrum | Enhanced position
2 [details]	16h 33m 09.19s248.28830°	+38° 32′ 26.2″38.54061°	7.1′′	Reasonable	3 (U)	1.3′	4.0 ks
Mean XRT rate: 2.06 (+1.10, -0.84) ×10-3 ct s-1 Peak XRT rate: 2.06 (+1.10, -0.84) ×10-3 ct s-1 RASS PSPC 3-σ upper limit: 0.15 ct s-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 6.3 (+3.3, -2.5) ×10-4 ct s-1 Peak XRT rate converted to PSPC: 6.3 (+3.3, -2.5) ×10-4 ct s-1 Mean XRT flux: 7.2 (+3.9, -2.9) ×10-13 erg cm-1s-1 Peak XRT flux: 7.2 (+3.9, -2.9) ×10-13 erg cm-1s-1 Products: Light curve | Spectrum
3 [details]	16h 33m 55.66s248.48192°	+38° 24′ 48.6″38.41350°	7.2′′	Good	3 (U)	10.6′	4.0 ks
Mean XRT rate: 4.6 (+1.8, -1.4) ×10-3 ct s-1 Peak XRT rate: 4.6 (+1.8, -1.4) ×10-3 ct s-1 RASS PSPC 3-σ upper limit: 0.04 ct s-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 4.3 (+1.7, -1.3) ×10-3 ct s-1 Peak XRT rate converted to PSPC: 4.3 (+1.7, -1.3) ×10-3 ct s-1 Mean XRT flux: 3.03 (+1.19, -0.95) ×10-13 erg cm-1s-1 Peak XRT flux: 3.03 (+1.19, -0.95) ×10-13 erg cm-1s-1 Products: Light curve | Spectrum
4 [details]	16h 33m 02.05s248.25854°	+38° 31′ 34.4″38.52624°	6.2′′	Poor	3 (U)	2.4′	4.0 ks
Mean XRT rate: 1.75 (+1.02, -0.75) ×10-3 ct s-1 Peak XRT rate: 1.75 (+1.02, -0.75) ×10-3 ct s-1 RASS PSPC 3-σ upper limit: 0.02 ct s-1 (PSPC count-rate) Products: Light curve | Spectrum

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.