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Home > Einstein Probe follow up > EP250304a

EP_FIELD00025

EP

25

/EP

EP250304a: 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]	13h 53m 34.58s208.39408°	-42° 48′ 16.7″-42.80464°	4.1′′	Good	2 (O)	0.8′	28.0 ks	The source is fading with 4.4-σ significance. Matches known X-ray source: LSXPS J135334.6-424816 (from LSXPS), 1″ away.
Mean XRT rate: 1.01 (±0.08) ×10-2 ct s-1 Peak XRT rate: 0.21 (±0.05) ct s-1 -4.14 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: 0.0126 (±0.0010) ct s-1 Peak XRT rate converted to PSPC: 0.26 (±0.06) ct s-1 Mean XRT flux: 3.9 (±0.3) ×10-13 erg cm-1s-1 Peak XRT flux: 8.1 (±1.8) ×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 10 sources have been found in the XRT data. 6 sources match catalogued sources.

#	RA (J2000)	Dec (J2000)	Err901	Detection Flag2	Rank3	Dist from Einstein Probe/WXT pos	Exposure	Notes	Vizier
1 [details]	13h 53m 34.58s208.39408°	-42° 48′ 16.7″-42.80464°	4.1′′	Good	2 (O)	0.8′	28.0 ks	The source is fading with 4.4-σ significance. Matches known X-ray source: LSXPS J135334.6-424816 (from LSXPS), 1″ away.
Mean XRT rate: 1.01 (±0.08) ×10-2 ct s-1 Peak XRT rate: 0.21 (±0.05) ct s-1 -4.14 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: 0.0126 (±0.0010) ct s-1 Peak XRT rate converted to PSPC: 0.26 (±0.06) ct s-1 Mean XRT flux: 3.9 (±0.3) ×10-13 erg cm-1s-1 Peak XRT flux: 8.1 (±1.8) ×10-12 erg cm-1s-1 Products: Light curve | Spectrum | Enhanced position
2 [details]	13h 53m 05.72s208.27384°	-42° 44′ 48.2″-42.74671°	7.1′′	Reasonable	4 (K)	6.8′	28.0 ks	Matches known X-ray source: LSXPS J135305.5-424449 (from LSXPS), 2.1″ away.
Mean XRT rate: 2.5 (±0.5) ×10-3 ct s-1 Peak XRT rate: 2.6 (±0.7) ×10-3 ct s-1 -0.33 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: 2.1 (±0.4) ×10-3 ct s-1 Peak XRT rate converted to PSPC: 2.2 (±0.6) ×10-3 ct s-1 Mean XRT flux: 1.40 (±0.29) ×10-13 erg cm-1s-1 Peak XRT flux: 1.4 (±0.4) ×10-13 erg cm-1s-1 Products: Light curve | Spectrum
3 [details]	13h 53m 16.57s208.31906°	-42° 50′ 23.1″-42.83975°	7.5′′	Poor	4 (K)	3.5′	28.0 ks	Matches known X-ray source: LSXPS J135316.5-425019 (from LSXPS), 3.4″ away.
Mean XRT rate: 1.4 (±0.4) ×10-3 ct s-1 Peak XRT rate: 1.4 (±0.4) ×10-3 ct s-1 -0.39 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: 1.9 (±0.5) ×10-3 ct s-1 Peak XRT rate converted to PSPC: 1.9 (±0.5) ×10-3 ct s-1 Mean XRT flux: 4.8 (±1.4) ×10-14 erg cm-1s-1 Peak XRT flux: 4.8 (±1.4) ×10-14 erg cm-1s-1 Products: Light curve | Spectrum
4 [details]	13h 53m 55.03s208.47931°	-42° 40′ 25.8″-42.67384°	7.1′′	Poor	4 (K)	9.4′	28.0 ks	Matches known X-ray source: LSXPS J135355.0-424022 (from LSXPS), 3.6″ away.
Mean XRT rate: undetermined ct s-1 Peak XRT rate: undetermined ct s-1 -1.25 σ above the catalogued flux from LSXPS. RASS PSPC 3-σ upper limit: 0.0×100 ct s-1 (PSPC count-rate) Products: Light curve
5 [details]	13h 53m 03.33s208.26387°	-42° 41′ 39.1″-42.69420°	8.0′′	Poor	4 (K)	9.4′	28.0 ks	Matches known X-ray source: LSXPS J135303.4-424141 (from LSXPS), 2.8″ away.
Mean XRT rate: 6.4 (+3.0, -2.5) ×10-4 ct s-1 Peak XRT rate: 6.4 (+3.0, -2.5) ×10-4 ct s-1 0.26 σ below 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: 9 (±4) ×10-4 ct s-1 Peak XRT rate converted to PSPC: 9 (±4) ×10-4 ct s-1 Products: Light curve
6 [details]	13h 53m 10.68s208.29448°	-42° 49′ 25.7″-42.82381°	6.0′′	Poor	3 (U)	4.4′	28.0 ks
Mean XRT rate: undetermined ct s-1 Peak XRT rate: undetermined ct s-1 RASS PSPC 3-σ upper limit: 0.02 ct s-1 (PSPC count-rate) Mean XRT rate converted to PSPC: undetermined ct s-1 Peak XRT rate converted to PSPC: undetermined ct s-1 Products: Light curve
7 [details]	13h 54m 28.54s208.61890°	-42° 51′ 52.8″-42.86468°	12.2′′	Good	3 (U)	10.3′	28.0 ks
Mean XRT rate: 7.8 (+3.4, -2.8) ×10-4 ct s-1 Peak XRT rate: 7.8 (+3.4, -2.8) ×10-4 ct s-1 RASS PSPC 3-σ upper limit: 0.05 ct s-1 (PSPC count-rate) Products: Light curve | Spectrum
8 [details]	13h 53m 13.09s208.30456°	-42° 40′ 09.4″-42.66927°	6.6′′	Poor	3 (U)	9.8′	28.0 ks
Mean XRT rate: undetermined ct s-1 Peak XRT rate: undetermined ct s-1 RASS PSPC 3-σ upper limit: 0.05 ct s-1 (PSPC count-rate) Mean XRT rate converted to PSPC: undetermined ct s-1 Peak XRT rate converted to PSPC: undetermined ct s-1 Products: Light curve
9 [details]	13h 53m 18.94s208.32893°	-42° 47′ 30.3″-42.79176°	7.7′′	Poor	4 (K)	3.3′	28.0 ks	Matches known X-ray source: LSXPS J135319.3-424724 (from LSXPS), 6.9″ away.
Mean XRT rate: 1.0 (±0.3) ×10-3 ct s-1 Peak XRT rate: 1.0 (±0.3) ×10-3 ct s-1 -0.50 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: 4.2 (±1.4) ×10-4 ct s-1 Peak XRT rate converted to PSPC: 4.2 (±1.4) ×10-4 ct s-1 Mean XRT flux: 1.2 (±0.4) ×10-13 erg cm-1s-1 Peak XRT flux: 1.2 (±0.4) ×10-13 erg cm-1s-1 Products: Light curve | Spectrum
10 [details]	13h 53m 53.48s208.47285°	-42° 58′ 43.6″-42.97877°	5.9′′	Poor	3 (U)	10.2′	26.7 ks
Mean XRT rate: undetermined ct s-1 Peak XRT rate: undetermined ct s-1 RASS PSPC 3-σ upper limit: 0.03 ct s-1 (PSPC count-rate) Mean XRT rate converted to PSPC: undetermined ct s-1 Peak XRT rate converted to PSPC: undetermined ct s-1 Products: Light curve

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.

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Exposure map

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FITS exposure map.