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Swift Trigger: 1223470

Presumed name: GRB 240421B

Back to trigger list.

BAT 19h 58m 44.64s, -14° 52′ 44.4″
position:(299.686, -14.879 ± 180″)
XRT 19h 58m 48.17s, -14° 51′ 34.6″
position:(299.70069, -14.85962 ± 1.9″)
UVOT No position available.
Galactic NHI:7.40×1020 cm-2
Galactic E(B-V):0.197 mag
Best RA:19h 58m 48.17s= 299.70069 d
Best Dec:-14° 51′ 34.6″= -14.85962 d
Gal Lat:-21.48
Gal Long:26.73
Sun angle:92.68°, 6.0 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 12 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

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
161.1299.7467-14.8649ATO J299.7466-14.8648B=15.776, G=15.024942, H=13.260, J=13.526, K=13.167, R=14.805, V=15.052, g=15.354, i=14.402, r=14.775Query 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
13.9299.7008-14.8636NEDQuery vizier around this object
18.8299.6967-14.8561NEDQuery vizier around this object
21.2299.6948-14.8580B1=18.6, B2=18.4, I=17.6, R1=17.3, R2=17.6USNO-B1Query vizier around this object
21.4299.6946-14.8581NEDQuery vizier around this object
27.4299.7067-14.8547NEDQuery vizier around this object
28.8299.7013-14.8517NEDQuery vizier around this object
29.5299.7045-14.8669B=20.2, R2=19.0, i=18.5SSSQuery vizier around this object
30.9299.7011-14.8510B=21.2, R2=19.3, i=18.4SSSQuery vizier around this object
31.3299.7071-14.8658NEDQuery vizier around this object
31.9299.7072-14.8659B=18.5, R2=16.9, i=16.6SSSQuery vizier around this object


There are 298 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
14.2299.6993-14.8633B2=20.0, R2=20.3USNO-B1Query vizier around this object
14.5299.6986-14.8631B2=20.6, I=18.7, R1=19.0, R2=19.4USNO-B1Query vizier around this object
18.8299.6968-14.8560B1=18.5, B2=18.2, I=17.2, R1=16.7, R2=17.3USNO-B1Query vizier around this object
18.8299.6968-14.8560h=15.5, j=16.1, k=15.42MASSQuery vizier around this object
21.4299.6948-14.8580h=16.0, j=16.3, k=15.72MASSQuery vizier around this object
28.8299.7012-14.8516B2=20.7, I=18.4, R2=18.6USNO-B1Query vizier around this object
29.0299.7045-14.8668B1=20.6, B2=19.9, I=18.3, R1=18.6, R2=18.8USNO-B1Query vizier around this object
29.9299.7085-14.8562B1=20.1, B2=21.1, R2=20.1USNO-B1Query vizier around this object
31.3299.7070-14.8658h=15.1, j=15.9, k=15.02MASSQuery vizier around this object
31.5299.6953-14.8667B1=20.5, B2=20.5, R2=19.6USNO-B1Query vizier around this object

Queried USNO-B1, SDSS, 2MASS.

There are 342 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.