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Swift Trigger: 380311

Presumed name: GRB 091221

Back to trigger list.

BAT 03h 43m 00.96s, +23° 12′ 43.2″
position:(55.754, 23.212 ± 180″)
XRT 03h 43m 11.59s, +23° 14′ 25.1″
position:(55.79829, 23.24031 ± 4.2″)
UVOT No position available.
Galactic NHI:0.00×100 cm-2
Galactic E(B-V):0.216 mag
Best RA:03h 43m 11.59s= 55.79829 d
Best Dec:+23° 14′ 25.1″= 23.24031 d
Gal Lat:
Gal Long:
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

UVOT unknown image

unknown image

UVOT unknown image

unknown image

Blink images with DSS (link via GSFC)


SPER results page for this trigger.

No SPER data received yet. Refresh this page to check again.

Known transients within 5′ of the GRB

Click on the offset to view the transient announcement.

Offset (′′)RA DecDate reportedSource MiscQuery
0.0′′55.7982923.24031GCN #10283GRB 091221: Swift detection of a burstVizier logo
4.1′′55.7975023.24119GCN #10289GRB 091221: Swift/UVOT refined analysisVizier logo
4.1′′55.7975023.24119GCN #10287GRB 091221: Enhanced Swift-XRT positionVizier logo
4.1′′55.7977923.24136GCN #10285GRB 091221: UVOT Confirmation of an Optical AfterglowVizier logo
4.6′′55.7977923.24149GCN #10284GRB 091221: ROTSE-III Detection of Optical CounterpartVizier logo
9.7′′55.7980023.24300GCN #10291GRB 091221 Swift-BAT refined analysisVizier logo

There are 12 matches in total. See the full table for details.

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
3.955.797523.2411GRB 091221Query vizier around this object
57.755.786423.2521Cl* Melotte 22 SK 655H=11.668, J=12.368, K=11.518, V=14.85Query vizier around this object
78.255.820923.2466GSC 01799-01116B=13.300, H=8.466, J=9.135, K=8.277, R=11.000, V=11.09Query vizier around this object
185.855.852223.2259Cl* Melotte 22 TRU 34B=11.2, H=8.722, I=9.68, J=9.101, K=8.655, R=9.90, U=11.39, V=10.7Query vizier around this object

There are 4 SIMBAD objects within the position error. The full list is here.

* 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
4.155.797523.2411NEDQuery vizier around this object
10.355.800223.2381B2=21.8, I=18.7, R1=19.4USNO-B1Query vizier around this object
25.955.793623.2345B2=21.9, I=18.8, R2=21.0USNO-B1Query vizier around this object
26.655.793923.2465B2=21.2, R1=19.8, R2=19.4USNO-B1Query vizier around this object
52.655.808823.2512B=20.6, R=18.4APM-NQuery vizier around this object
59.455.801023.2240I=17.0, R1=19.9USNO-B1Query vizier around this object
60.855.815623.2459B=21.1, R=19.9APM-NQuery vizier around this object
63.855.779023.2397B=20.8, R=20.0APM-NQuery vizier around this object
65.455.816723.2470B=21.1, R=19.8APM-NQuery vizier around this object
68.855.799123.2594B=21.1, R=20.0APM-NQuery vizier around this object


There are 82 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
10.355.800423.2382B2=21.1, I=18.8, R1=19.4, R2=19.9USNO-B1Query vizier around this object
33.355.808123.2423B1=18.7, B2=18.0, I=17.0, R1=16.9, R2=17.1USNO-B1Query vizier around this object
33.455.808223.2423h=15.7, j=15.9, k=15.42MASSQuery vizier around this object
36.755.788723.2353I=18.9, R1=19.4USNO-B1Query vizier around this object
41.855.788423.2330B1=20.5, B2=20.4, I=18.4, R1=19.5, R2=19.1USNO-B1Query vizier around this object
52.255.808723.2512B2=20.6, I=18.4, R1=18.9, R2=19.5USNO-B1Query vizier around this object
57.755.786423.2521h=11.7, j=12.4, k=11.52MASSQuery vizier around this object
58.055.786423.2521B1=17.1, B2=16.1, I=13.0, R1=13.9, R2=14.2USNO-B1Query vizier around this object
61.255.793923.2568h=12.2, j=12.7, k=12.12MASSQuery vizier around this object
61.455.793823.2569B1=16.0, B2=15.3, I=13.2, R1=13.6, R2=14.1USNO-B1Query vizier around this object

Queried USNO-B1, SDSS, 2MASS.

There are 101 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.