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Home > Einstein Probe follow up > EP#01709175213

EP_FIELD00037

EP

37

/EP

EP#01709175213: Swift observation summary

About tiled field analysis.

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

1 fields were processed but not included in the analysis. This is because, after standard processing and the removal of times contaminated by light reflected off the bright Earth, there was too little data (<100 s) for source detection to be performed.

Details of afterglow candidates

1 sources were found which matches the afterglow criteria.

#	RA (J2000)	Dec (J2000)	Err901	Detection Flag2	Rank3	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 6 sources have been found in the XRT data. 2 sources match catalogued sources. There are also 2 sources marked as spurious.

#	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
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	4 (K)	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	4 (K)	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 may be affected by optical loading
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
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 may be affected by optical loading This source may be affected by optical loading
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 may be affected by optical loading
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

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.