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Swift Trigger: 1002158

Presumed name: GRB 201027A

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BAT 10h 23m 53.76s, -05° 30′ 53.6″
position:(155.974, -5.5149 ± 180″)
XRT 10h 23m 52.80s, -05° 30′ 36.4″
position:(155.9700, -5.5101 ± 2.3″)
UVOT No position available.
Galactic NHI:4.06×100 cm-2
Galactic E(B-V):0.043 mag
Best RA:10h 23m 52.80s= 155.9700 d
Best Dec:-05° 30′ 36.4″= -5.5101 d
Gal Lat:41.66
Gal Long:249.82
Sun angle:55.52°, 3.72 hr West

1Sper #4 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

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
0.0′′155.97000-5.51010GCN #28788GRB 201027A: Swift detection of a burstVizier logo
0.9′′155.96975-5.51003GCN #28792GRB 201027A: Enhanced Swift-XRT positionVizier logo
22.7′′155.97400-5.51500GCN #28787Swift GRB201027.05: Global MASTER-Net observations report Vizier logo
69.2′′155.95417-5.49911GCN #28801GRB 201027A: 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
136.3155.9850-5.47532dFGRS TGN098Z007B=18.503, R=17.348Query vizier around this object
170.4156.0162-5.4990TYC 4911-891-1B=12.03, G=11.3348, H=10.401, J=10.594, K=10.424, V=11.68Query vizier around this object
179.6156.0187-5.5218LCRS B102133.3-051605Query vizier around this object

There are 3 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
14.3155.9658-5.5094NEDQuery vizier around this object
14.4155.9660-5.5094R1=19.7, R2=20.0USNO-B1Query vizier around this object
27.8155.9621-5.5108NEDQuery vizier around this object
29.8155.9646-5.5039NEDQuery vizier around this object
30.6155.9646-5.5167NEDQuery vizier around this object
31.9155.9696-5.5011NEDQuery vizier around this object
34.6155.9746-5.5186NEDQuery vizier around this object
36.5155.9738-5.5007B1=20.7, B2=20.8, R1=20.0USNO-B1Query vizier around this object
36.7155.9733-5.5003NEDQuery vizier around this object
41.0155.9733-5.5208NEDQuery vizier around this object


There are 180 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
22.6155.9650-5.5139B1=20.5, B2=20.4, I=18.6, R1=19.9, R2=19.7USNO-B1Query vizier around this object
41.1155.9735-5.5210h=13.4, j=14.1, k=13.22MASSQuery vizier around this object
41.1155.9735-5.5210B1=18.2, B2=18.0, I=15.0, R1=15.8, R2=16.1USNO-B1Query vizier around this object
48.6155.9610-5.5202B1=20.1, B2=19.4, I=18.4, R1=18.7, R2=18.6USNO-B1Query vizier around this object
50.1155.9662-5.4967I=18.4, R1=19.5, R2=19.2USNO-B1Query vizier around this object
53.9155.9722-5.5249h=13.6, j=13.8, k=13.32MASSQuery vizier around this object
54.0155.9723-5.5249B1=15.5, B2=15.7, I=14.2, R1=14.1, R2=14.6USNO-B1Query vizier around this object
68.5155.9528-5.5183B1=20.5, B2=20.8, R1=20.0, R2=19.7USNO-B1Query vizier around this object
69.2155.9887-5.5053B1=20.2, B2=19.4, I=18.1, R1=18.2, R2=18.5USNO-B1Query vizier around this object
72.4155.9899-5.5065B1=20.9, B2=20.7, I=18.7, R2=19.4USNO-B1Query vizier around this object

Queried USNO-B1, SDSS, 2MASS.

There are 78 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.