Skip banner and navigation tools.

 |  site map

Sky images|
UVOT images|
SPER data|

[Hide] [Trigger list]

Swift Trigger: 1069551

Presumed name: GRB 210820A

Back to trigger list.

BAT 01h 22m 30.96s, +04° 37′ 55.2″
position:(20.629, +4.632 ± 180″)
XRT 01h 22m 33.48s, +04° 36′ 28.8″
position:(20.6395, 4.6080 ± 1.9″)
UVOT 01h 22m 33.48s, +04° 36′ 28.1″
position:(20.6395, +4.6078 ± 0.8″)
Galactic NHI:3.27×1020 cm-2
Galactic E(B-V):0.029 mag
Best RA:01h 22m 33.48s= 20.6395 d
Best Dec:+04° 36′ 28.1″= +4.6078 d
Gal Lat:-57.39
Gal Long:137.43
Sun angle:126.73°, 8.6 hr West

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 8 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′′20.639504.60783GCN #30664GRB 210820A: Swift detection of a burst with an optical counterpartVizier logo
0.2′′20.639464.60781GCN #30672GRB 210820A: RATIR Optical DetectionsVizier logo
0.2′′20.639504.60786GCN #30686GRB 210820A: Swift/UVOT DetectionVizier logo
0.7′′20.639624.60764GCN #30667GRB 210820A: Enhanced Swift-XRT positionVizier logo
136.9′′20.622504.64183GCN #30675GRB 210820A: Swift-BAT refined analysisVizier logo

There are 11 matches in total. See the full table for details.

Catalogue Searches. Searched 200′ 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.


RA*Dec*Redshift CatalogueQuery
2.620.64004.6075NEDQuery vizier around this object
15.520.64124.6039NEDQuery vizier around this object
18.520.63884.6028NEDQuery vizier around this object
34.420.64754.6128NEDQuery vizier around this object
39.020.64124.5972NEDQuery vizier around this object
43.620.63834.5958NEDQuery vizier around this object
44.320.63254.5975NEDQuery vizier around this object
44.520.63174.6175NEDQuery vizier around this object
44.720.63214.5975NEDQuery vizier around this object
46.420.62964.5994NEDQuery vizier around this object


There are 194 galaxies within the position error. The full list is here.

* RA/Dec in equinox J2000

Magnitudes depend on the catalogue. e.g. For Sloan, R is the Sloan r mag, not the Johnson R from APM, for example


RA*Dec* CatalogueQuery
39.620.64144.5972B1=18.6, B2=19.0, I=17.2, R1=17.4, R2=18.0USNO-B1Query vizier around this object
39.720.64134.5971h=15.8, j=16.2, k=15.42MASSQuery vizier around this object
44.220.63824.5958B1=15.1, B2=16.2, I=13.9, R1=14.1, R2=14.5USNO-B1Query vizier around this object
44.420.63824.5957h=13.4, j=13.7, k=13.32MASSQuery vizier around this object
45.020.63244.5977B1=20.1, B2=20.3, I=16.1, R1=17.6, R2=18.1USNO-B1Query vizier around this object
45.320.63244.5976h=14.4, j=15.0, k=14.22MASSQuery vizier around this object
46.720.62974.5995B2=21.2, I=16.9, R1=18.9, R2=19.1USNO-B1Query vizier around this object
46.920.62974.5994h=15.2, j=15.8, k=14.92MASSQuery vizier around this object
49.620.64304.6213B1=19.9, B2=21.2, R2=20.1USNO-B1Query vizier around this object
54.720.62854.5975B2=21.3, R1=19.7, R2=20.0USNO-B1Query vizier around this object

Queried USNO-B1, SDSS, 2MASS.

There are 71 stars within the position error. The full list is here.

* RA/Dec in equinox J2000

Magnitudes depend on the catalogue. e.g. For Sloan, R is the Sloan r mag, not the Johnson R from APM, for example.