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EP250427a / GRB 250427A: Swift observation summary

This is a confirmed GRB (GRB 250427A), the afterglow is source 1 -- please see the GRB results at https://www.swift.ac.uk/xrt_products/00019750 for updated analysis

.
Mission:Einstein Probe/WXT
Einstein Probe RA:277.281°
Einstein Probe Dec:+7.570°
Einstein Probe Err:2.0 arcmin
T0:2025-04-27 03:38:24 UT
Galactic:37.18° +8.39°
Galactic NH:1.76× 1021 cm-2
Sun distance:114.10°
Sun angle:7.81 [hr] (West of Sun)
Moon distance:104.75°
Visibility of this field.
Data analysed so far:
  • ObsID: 00019750001 with 1.7 ks exposure.

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.

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]		 18h 29m 05.47s +07° 33′ 47.6″ 3.9′′ Good 3 (U) 0.6′ 1.7 ks Vizier logo

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.

FITS image.

Image of all observations processed so far

Exposure map

FITS exposure map.

Exposure map of all observations processed so far