Skip banner and navigation tools.

School of Physics & Astronomy

US Site | Italian Site | UK site

Home > Einstein Probe follow up > EP250421a

EP_FIELD00035

EP

35

/EP

EP250421a: Swift observation summary

Data analysed so far:

• ObsID: 00019726001 with 1.8 ks exposure.

About tiled field analysis.

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

• 19726 — 1.8 ks of cleaned data taken between 2025-04-21 17:51:19 and 2025-04-21 19:31:32

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]	11h 29m 40.80s172.42000°	-24° 40′ 32.4″-24.67568°	2.7′′ *	Good	2 (O)	0.6′	1.8 ks	The source is 4.0-σ above the RASS limit.
Mean XRT rate: 0.272 (±0.017) ct s-1 Peak XRT rate: 0.39 (±0.09) ct s-1 RASS PSPC 3-σ upper limit: 0.04 ct s-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 0.320 (±0.020) ct s-1 Peak XRT rate converted to PSPC: 0.46 (±0.10) ct s-1 Mean XRT flux: 1.05 (±0.07) ×10-11 erg cm-1s-1 Peak XRT flux: 1.5 (±0.3) ×10-11 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]	11h 29m 40.80s172.42000°	-24° 40′ 32.4″-24.67568°	2.7′′ *	Good	2 (O)	0.6′	1.8 ks	The source is 4.0-σ above the RASS limit.
Mean XRT rate: 0.272 (±0.017) ct s-1 Peak XRT rate: 0.39 (±0.09) ct s-1 RASS PSPC 3-σ upper limit: 0.04 ct s-1 (PSPC count-rate) Mean XRT rate converted to PSPC: 0.320 (±0.020) ct s-1 Peak XRT rate converted to PSPC: 0.46 (±0.10) ct s-1 Mean XRT flux: 1.05 (±0.07) ×10-11 erg cm-1s-1 Peak XRT flux: 1.5 (±0.3) ×10-11 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

Select image style: Draggable PNG | JS9.

Magnify image and make scrollable?

FITS image.

---

Exposure map

Magnify exposure map and make scrollable?

FITS exposure map.