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Swift Trigger: 1044426

Presumed name: GRB 210421A

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BAT 06h 59m 37.92s, +04° 56′ 02.4″
position:(104.908, +4.934 ± 180″)
XRT 06h 59m 30.17s, +04° 55′ 18.0″
position:(104.87569, 4.92168 ± 3.7″)
UVOT No position available.
Galactic NHI:3.21×1021 cm-2
Galactic E(B-V):0.402 mag
Best RA:06h 59m 30.17s= 104.87569 d
Best Dec:+04° 55′ 18.0″= 4.92168 d
Gal Lat:4.03
Gal Long:209.46
Sun angle:75.50°, -5.1 hr East of Sun

GCN Notices for this burst.

View this region in Aladin.

Observability of this burst for Swift.

Sun angle for this burst.

UVOT data

No UVOT images are currently available.


SPER results page for this trigger.

Image of the SPER data

There are 2 SPER messages, and 1 objects have been found

See the SPER page for details of how this position was produced.

Known transients within 5′ of the GRB

Click on the offset to view the transient announcement.

Offset (′′)RA DecDate reportedSource MiscQuery
0.1′′104.875714.92167GCN #29849GRB 210421A: Swift detection of a burstVizier logo
5.1′′104.874434.92232GCN #29865GRB 210421A: Enhanced Swift-XRT positionVizier logo
32.1′′104.882004.92800GCN #29893GRB 210421A: Swift-BAT refined analysisVizier logo

Catalogue Searches. Searched 0′ around XRT position

Click on the distance to view the full details (not available for sources from the SSS catalogue). Click on the column headers to sort the table on that column (click again to invert sort order).


RA*Dec*SIMBAD name Query

* RA/Dec in equinox J2000

X-ray sources

RA*Dec* Source table2Observatory Query

Queried the X-ray MASTER catalogue.

* RA/Dec in equinox J2000

1Energy band for count-rate is mission specific.