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Swift Trigger: 652847

Presumed name: GRB 150821A

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BAT 22h 47m 37.44s, -57° 52′ 30.0″
position:(341.906, -57.875 ± 180″)
XRT 22h 47m 39.12s, -57° 53′ 36.9″
position:(341.91301, -57.89357 ± 3.6″)
UVOT 22h 47m 39.17s, -57° 53′ 38.0″
position:(341.9132, -57.8939 ± 0.6″)
Galactic NHI:1.69×100 cm-2
Galactic E(B-V):0.017 mag
Best RA:22h 47m 39.17s= 341.9132 d
Best Dec:-57° 53′ 38.0″= -57.8939 d
Gal Lat:-52.37
Gal Long:329.52
Sun angle:133.47°, 11.2 hr West

1Sper #3 auto processing.

GCN Notices for this burst.

View this region in Aladin.

Observability of this burst for Swift.

Sun angle for this burst.

UVOT data

UVOT white image

white image

UVOT white image

white image

Blink images with DSS (link via GSFC)


SPER results page for this trigger.

Image of the SPER data

There are 5 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′′341.91325-57.89392GCN #18186GRB 150821A: Swift detection of a burst with an optical afterglowVizier logo
0.3′′341.91332-57.89384GCN #18191GRB 150821A: Enhanced Swift-XRT positionVizier logo
39.2′′341.91300-57.88300GCN #18196GRB 150821A� Swift-BAT refined analysisVizier logo

Catalogue Searches. Searched 3.33′ 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
159.4341.9756-57.9228TYC 8829-70-1B=12.57, H=10.688, J=10.976, K=10.62, V=12.34Query vizier around this object

* 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
12.7341.9104-57.8903B=21.5, R2=20.9SSSQuery vizier around this object
16.0341.9108-57.8897NEDQuery vizier around this object
26.8341.9203-57.8872B=21.8, R2=20.8SSSQuery vizier around this object
28.0341.9204-57.8872NEDQuery vizier around this object
32.1341.8983-57.8897NEDQuery vizier around this object
38.3341.9300-57.8992B=21.9, R2=20.3SSSQuery vizier around this object
42.8341.8938-57.8878NEDQuery vizier around this object
44.7341.9104-57.8817NEDQuery vizier around this object
48.2341.9233-57.9061Mag=19.6NEDQuery vizier around this object
50.2341.9230-57.9065B=21.5, R2=20.1SSSQuery vizier around this object


There are 85 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
26.2341.9005-57.8906h=16.0, j=16.6, k=17.12MASSQuery vizier around this object
26.5341.9003-57.8907B2=17.9, I=17.6, R1=16.9, R2=16.7USNO-B1Query vizier around this object
29.0341.9029-57.8875B2=20.5, I=18.9USNO-B1Query vizier around this object
30.2341.9149-57.9019B2=20.7, R1=19.4, R2=19.4USNO-B1Query vizier around this object
38.0341.9300-57.8990B2=20.6, R1=19.4, R2=19.4USNO-B1Query vizier around this object
40.4341.9286-57.8860B2=20.6, R1=19.4USNO-B1Query vizier around this object
42.1341.8938-57.8879h=16.5, j=16.6, k=16.42MASSQuery vizier around this object
42.5341.8937-57.8878B2=18.0, I=18.1, R1=17.0, R2=16.9USNO-B1Query vizier around this object
49.9341.9230-57.9064B2=20.6, R1=19.3, R2=19.3USNO-B1Query vizier around this object
50.9341.8888-57.8994B2=19.0, I=18.5, R1=18.0, R2=17.8USNO-B1Query vizier around this object

Queried USNO-B1, SDSS, 2MASS.

There are 104 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.