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Swift Trigger: 1069169

Presumed name: GRB 210818A

Back to trigger list.

BAT 09h 56m 31.44s, -87° 01′ 51.6″
position:(149.131, -87.031 ± 180″)
XRT 09h 55m 26.52s, -87° 01′ 29.6″
position:(148.8605, -87.0249 ± 1.9″)
UVOT 09h 55m 28.13s, -87° 01′ 28.6″
position:(148.8672, -87.0246 ± 0.6″)
Galactic NHI:1.04×1021 cm-2
Galactic E(B-V):0.212 mag
Best RA:09h 55m 28.13s= 148.8672 d
Best Dec:-87° 01′ 28.6″= -87.0246 d
Gal Lat:-24.97
Gal Long:300.65
Sun angle:not found

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 11 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
0.2′′148.86729-87.02467GCN #30652GRB 210818A: Swift detection of a burst with an optical counterpartVizier logo
2.3′′148.86763-87.02525GCN #30653GRB 210818A: Enhanced Swift-XRT positionVizier logo
22.0′′148.94900-87.02900GCN #30659GRB 210818A: Swift-BAT refined analysisVizier logo

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
150.9148.1810-87.0024TYC 9514-366-1B=12.49, G=11.5060, H=10.051, J=10.372, K=10.001, V=11.79Query vizier around this object

* RA/Dec in equinox J2000

X-ray sources

RA*Dec* Source table2Observatory Query
180.3149.7502-87.04470 +/- 0ROSATQuery vizier around this object
180.3149.7502-87.04470.0369 +/- 0.0154ROSATQuery vizier around this object

Queried the X-ray MASTER catalogue.

* RA/Dec in equinox J2000

1Energy band for count-rate is mission specific.


RA*Dec*Redshift CatalogueQuery
4.3148.8558-87.0236NEDQuery vizier around this object
19.3148.8629-87.0300NEDQuery vizier around this object
31.4148.7021-87.0231NEDQuery vizier around this object
33.3148.8350-87.0336NEDQuery vizier around this object
33.8149.0346-87.0211NEDQuery vizier around this object
34.2149.0500-87.0242NEDQuery vizier around this object
34.7149.0333-87.0214I=17.9, R2=19.9USNO-B1Query vizier around this object
40.0148.8346-87.0136NEDQuery vizier around this object
40.1148.6529-87.0236NEDQuery vizier around this object
43.4148.6413-87.0275NEDQuery vizier around this object


There are 231 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
30.1148.7035-87.0230R1=20.3, R2=19.6USNO-B1Query vizier around this object
32.0148.8351-87.0337h=15.3, j=16.0, k=15.22MASSQuery vizier around this object
32.5148.8354-87.0338B2=18.4, I=17.1, R1=17.4, R2=17.5USNO-B1Query vizier around this object
35.9149.0377-87.0211B2=19.4, I=18.9, R1=18.7, R2=18.3USNO-B1Query vizier around this object
41.1148.6463-87.0276B2=16.1, I=14.4, R1=15.2, R2=15.0USNO-B1Query vizier around this object
41.3148.6449-87.0275h=13.3, j=13.9, k=13.22MASSQuery vizier around this object
44.9148.9655-87.0361h=13.9, j=14.3, k=13.92MASSQuery vizier around this object
45.8148.9646-87.0364B2=16.0, I=13.9, R1=15.2, R2=14.5USNO-B1Query vizier around this object
46.9148.9641-87.0368B2=16.0, I=14.2, R2=13.9USNO-B1Query vizier around this object
50.9148.9588-87.0381B2=16.7, I=15.4, R1=15.4, R2=15.1USNO-B1Query vizier around this object

Queried USNO-B1, SDSS, 2MASS.

There are 186 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.