EP#01709175213: Swift observation summary

Mission:	Einstein Probe/WXT
Einstein Probe RA:	299.150°
Einstein Probe Dec:	+3.460°
Einstein Probe Err:	3.1 arcmin
T0:	2025-05-06 21:07:59 UT
Galactic:	43.65° -12.81°
Galactic N_H:	9.55× 10²⁰ cm^-2

Sun distance:	102.94°
Sun angle:	6.98 [hr] (West of Sun)
Moon distance:	133.38°
Visibility of this field.
First slew:	2025-05-06 21:54:47 UT
First observation:	2025-05-06 21:54:15 UT
First analysis:	2025-05-07 00:47:13 UT

Data analysed so far:

ObsID: 00019768001 with 1.1 ks exposure.

About tiled field analysis.

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

19768 — 1.1 ks of cleaned data taken between 2025-05-06 21:54:44 and 2025-05-06 23:39:46

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]	19h 56m 39.02s299.16259°	+03° 26′ 43.8″3.44549°	2.5′′ ^*	Good	2 (O)	1.2′	1.1 ks	Matches SIMBAD source: IGR J19566+0326, 1.2″ away. Matches known X-ray source: LSXPS J195639.1+032642 (from LSXPS), 2.4″ away.
Mean XRT rate: 15.2 (±0.4) ct s^-1 Peak XRT rate: 21 (±4) ct s^-1 -5.40 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: 17.9 (±0.5) ct s^-1 Peak XRT rate converted to PSPC: 25 (±5) ct s^-1 Mean XRT flux: 6.15 (±0.16) ×10^-10 erg cm^-1s^-1 Peak XRT flux: 8.7 (±1.6) ×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. There are also 6 sources marked as spurious.

#	RA (J2000)	Dec (J2000)	Err₉₀¹	Detection Flag²	Rank³	Dist from Einstein Probe/WXT pos	Exposure	Notes
1 [details]	19h 56m 39.02s299.16259°	+03° 26′ 43.8″3.44549°	2.5′′ ^*	Good	2 (O)	1.2′	1.1 ks	Matches SIMBAD source: IGR J19566+0326, 1.2″ away. Matches known X-ray source: LSXPS J195639.1+032642 (from LSXPS), 2.4″ away.
Mean XRT rate: 15.2 (±0.4) ct s^-1 Peak XRT rate: 21 (±4) ct s^-1 -5.40 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: 17.9 (±0.5) ct s^-1 Peak XRT rate converted to PSPC: 25 (±5) ct s^-1 Mean XRT flux: 6.15 (±0.16) ×10^-10 erg cm^-1s^-1 Peak XRT flux: 8.7 (±1.6) ×10^-10 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position
2 [details]	19h 56m 30.87s299.12863°	+03° 39′ 09.2″3.65255°	6.6′′ ^*	Good	4 (K)	11.6′	1.1 ks	Matches known X-ray source: LSXPS J195631.0+033908 (from LSXPS), 2.2″ away.
Mean XRT rate: undetermined ct s^-1 Peak XRT rate: undetermined ct s^-1 0.03 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 \| Enhanced position
3 [details]	19h 56m 38.95s299.16231°	+03° 27′ 09.1″3.45254°	4.0′′ ^*	Reasonable	2 (O)	0.9′	930 s	The source is 4.9-σ above the LSPXS limit. This source is extended or caused by diffuse emission.
Mean XRT rate: 1.65 (±0.06) ct s^-1 Peak XRT rate: 2.7 (±0.6) ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 1.52 (±0.05) ct s^-1 Peak XRT rate converted to PSPC: 2.5 (±0.5) ct s^-1 Mean XRT flux: 9.2 (±0.3) ×10^-11 erg cm^-1s^-1 Peak XRT flux: 1.5 (±0.3) ×10^-10 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position
4 [details]	19h 56m 34.18s299.14241°	+03° 26′ 11.6″3.43655°	5.9′′ ^*	Poor	3 (U)	1.5′	1.1 ks	The source is 5.6-σ above the LSPXS limit. This source is extended or caused by diffuse emission.
Mean XRT rate: 11.0 (±0.3) ct s^-1 Peak XRT rate: 17 (±3) ct s^-1 RASS PSPC 3-σ upper limit: 0.04 ct s^-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 13.0 (±0.4) ct s^-1 Peak XRT rate converted to PSPC: 21 (±4) ct s^-1 Mean XRT flux: 4.42 (±0.12) ×10^-10 erg cm^-1s^-1 Peak XRT flux: 7.0 (±1.3) ×10^-10 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position
5 [details]	19h 56m 39.27s299.16361°	+03° 27′ 49.8″3.46384°	4.6′′ ^*	Poor	3 (U)	0.8′	1.1 ks	The source is 5.0-σ above the LSPXS limit. This source is extended or caused by diffuse emission.
Mean XRT rate: 1.02 (±0.12) ct s^-1 Peak XRT rate: 4.9 (±1.0) ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 1.35 (±0.16) ct s^-1 Peak XRT rate converted to PSPC: 6.5 (±1.3) ct s^-1 Mean XRT flux: 3.4 (±0.4) ×10^-11 erg cm^-1s^-1 Peak XRT flux: 1.6 (±0.3) ×10^-10 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position
6 [details]	19h 56m 30.41s299.12671°	+03° 27′ 18.9″3.45525°	6.3′′ ^*	Poor	3 (U)	1.4′	1.1 ks	This source is extended or caused by diffuse emission.
Mean XRT rate: 2.9 (±0.8) ×10^-2 ct s^-1 Peak XRT rate: 3.2 (±1.2) ×10^-2 ct s^-1 RASS PSPC 3-σ upper limit: 0.02 ct s^-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 0.038 (±0.010) ct s^-1 Peak XRT rate converted to PSPC: 0.042 (±0.015) ×10^-2 ct s^-1 Mean XRT flux: 1.03 (±0.28) ×10^-12 erg cm^-1s^-1 Peak XRT flux: 1.1 (±0.4) ×10^-12 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position
7 [details]	19h 56m 37.78s299.15741°	+03° 27′ 28.2″3.45784°	6.6′′ ^*	Poor	3 (U)	0.5′	1.1 ks	The source is fading with 4.0-σ significance. The source is 4.4-σ above the LSPXS limit. This source is affected by optical loading. This source is extended or caused by diffuse emission.
Mean XRT rate: 2.51 (±0.22) ct s^-1 Peak XRT rate: 4.0 (±0.9) ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 2.82 (±0.25) ct s^-1 Peak XRT rate converted to PSPC: 4.5 (±1.0) ct s^-1 Mean XRT flux: 1.07 (±0.10) ×10^-10 erg cm^-1s^-1 Peak XRT flux: 1.7 (±0.4) ×10^-10 erg cm^-1s^-1 Products: Light curve \| Spectrum \| Enhanced position
8 [details]	19h 56m 42.18s299.17576°	+03° 27′ 53.0″3.46472°	6.1′′	Poor	3 (U)	1.6′	1.1 ks	The source is 4.4-σ above the LSPXS limit. This source is extended or caused by diffuse emission.
Mean XRT rate: 3.13 (±0.16) ct s^-1 Peak XRT rate: 5.2 (±1.2) ct s^-1 RASS PSPC 3-σ upper limit: 0.03 ct s^-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 3.50 (±0.18) ct s^-1 Peak XRT rate converted to PSPC: 5.8 (±1.3) ct s^-1 Mean XRT flux: 1.30 (±0.07) ×10^-10 erg cm^-1s^-1 Peak XRT flux: 2.2 (±0.5) ×10^-10 erg cm^-1s^-1 Products: Light curve \| Spectrum

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