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GRB 250727A: Swift observation summary

This is a confirmed GRB (GRB 250727A), the afterglow is source 1 -- please see the GRB results at https://www.swift.ac.uk/xrt_products/00019965 for updated analysis

.
Mission:SVOM/ECLAIRs
SVOM RA:355.799°
SVOM Dec:-81.127°
SVOM Err:9.3 arcmin
T0:2025-07-27 10:53:39 UT
Galactic:306.12° -35.57°
Galactic NH:6.65× 1020 cm-2
Sun distance:114.83°
Sun angle:8.72 [hr] (West of Sun)
Moon distance:108.32°
Visibility of this field.
Data analysed so far:
  • ObsID: 00019965001 with 1.6 ks exposure.

About tiled field analysis.

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

Details of afterglow candidates

1 sources were found which matches the afterglow criteria.

:

# RA (J2000) Dec (J2000) Err901 Detection
Flag2
Rank3 Dist from
SVOM/ECLAIRs pos
Exposure Notes Vizier
1
[details]
23h 45m 39.52s -81° 12′ 50.4″ 4.2′′ * Good 2 (O) 7.7′ 5.9 ks The source is fading with 3.7-σ significance. 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.


Find an upper limit.

Sources found so far

So far 2 sources have been found in the XRT data. 0 sources match catalogued sources.

:

# RA (J2000) Dec (J2000) Err901 Detection
Flag2
Rank3 Dist from
SVOM/ECLAIRs pos
Exposure Notes Vizier
1
[details]
23h 45m 39.52s -81° 12′ 50.4″ 4.2′′ * Good 2 (O) 7.7′ 5.9 ks The source is fading with 3.7-σ significance. Vizier logo
2
[details]
23h 44m 06.83s -81° 03′ 15.6″ 8.5′′ Good 3 (U) 4.9′ 5.9 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