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GRB 250311A: Swift observation summary

Mission:MAXI
GRB RA:224.318°
GRB Dec:-2.613°
GRB Err:20.0 arcmin
T0:2025-03-11 01:55:22 UT
Galactic:353.47° +47.53°
Galactic NH:6.08× 1020 cm-2
Galactic E(B-V):0.103787
Sun distance:126.50°
Sun angle:8.46 [hr](West of Sun)
Moon distance:87.85°
Visibility of this field.
First slew:2025-03-11 11:29:28 UT
First observation:2025-03-11 11:28:56 UT
First analysis: UT

About tiled field analysis.

So far 4 fields have been scheduled for observations. Data are available and processed for 4 of these. The list gives the exposure time used in source detection. If any individual sources were selected for follow-up observations, the source detection is not repeated for the follow up observations and the table below is not updated.

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		 Dist from
MAXI pos		 Exposure Notes Vizier
1
[details]		 14h 57m 47.43s -02° 47′ 09.2″ 9.8′′ Poor 13.0′ 681 s This source may be affected by optical loading Vizier logo
2
[details]		 14h 57m 45.15s -02° 46′ 52.7″ 8.7′′ Poor 12.4′ 681 s This source may be affected by optical loading Vizier logo

1 Radius, 90% confidence.
2 Indicates how likely the source is to be real. See the 1SXPS documentation.
* 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