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Swift Trigger: 755354

Presumed name: GRB 170531B

Back to trigger list.

BAT 19h 07m 34.80s, -16° 25′ 33.6″
position:(286.895, -16.426 ± 180″)
XRT 19h 07m 32.02s, -16° 25′ 08.0″
position:(286.8834, -16.4189 ± 2.1″)
UVOT No position available.
Galactic NHI:8.87×100 cm-2
Galactic E(B-V):0.171 mag
Best RA:19h 07m 32.02s= 286.8834 d
Best Dec:-16° 25′ 08.0″= -16.4189 d
Gal Lat:-10.88
Gal Long:19.93
Sun angle:143.68°, 9.5 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

UVOT u image

u image

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 8 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
1.3′′286.88369-16.41911GCN #21175GRB 170531B: Enhanced Swift-XRT positionVizier logo
2.4′′286.88346-16.41956GCN #21171GRB 170531B: Swift detection of a burstVizier logo
2.4′′286.88346-16.41956GCN #21173GRB 170531B: MASTER Net OT detection Vizier logo
2.4′′286.88375-16.41833GCN #21210GRB 170531B: Zeiss-1000/CrAO optical observationsVizier logo
2.5′′286.88371-16.41828GCN #21177GRB 170531B: Redshift from GTC/OSIRISVizier logo
2.5′′286.88375-16.41828GCN #21188GRB 170531B: Swift/UVOT DetectionVizier logo
2.8′′286.88412-16.41858GCN #21179GRB 170531B: MASTER Net optical counterpart refind position and magnitudeVizier logo
5.1′′286.88196-16.41925GCN #21174GRB 170531B: CrAO confirmation of the afterglowVizier logo
63.3′′286.90100-16.41400GCN #21186GRB 170531B: Swift-BAT refined analysisVizier logo

There are 16 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
131.6286.8480-16.4053TYC 6283-655-1B=12.71, H=8.841, J=9.563, K=8.714, V=12.19Query 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
13.2286.8797-16.4182B1=18.0, I=16.4USNO-B1Query vizier around this object
13.8286.8807-16.4217I=16.3, R1=17.8USNO-B1Query vizier around this object
21.5286.8772-16.4186B=18.3, R2=16.8, i=16.4SSSQuery vizier around this object
21.8286.8776-16.4214B=20.0, R2=18.4, i=17.5SSSQuery vizier around this object
22.5286.8769-16.4185B1=18.2, I=15.8, R1=16.2, R2=16.2USNO-B1Query vizier around this object
31.3286.8891-16.4121B1=18.2, B2=17.9, I=16.8, R1=16.8, R2=17.0USNO-B1Query vizier around this object
32.4286.8843-16.4099B1=18.9, B2=18.3, I=17.6, R1=18.2, R2=17.8USNO-B1Query vizier around this object
39.1286.8750-16.4262B=19.4, R2=18.2, i=17.7SSSQuery vizier around this object
40.1286.8921-16.4115B1=18.5, B2=17.9, R1=17.3, R2=17.4USNO-B1Query vizier around this object
40.4286.8768-16.4282B=20.4, R2=19.2, i=18.7SSSQuery vizier around this object


There are 253 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
10.1286.8860-16.4177B1=19.1, B2=17.9, I=17.5, R1=17.7, R2=17.2USNO-B1Query vizier around this object
12.0286.8801-16.4178h=14.6, j=16.4, k=14.42MASSQuery vizier around this object
14.1286.8807-16.4219h=14.0, j=14.6, k=13.82MASSQuery vizier around this object
14.4286.8811-16.4156B1=19.3, B2=18.3, R1=17.8, R2=17.7USNO-B1Query vizier around this object
15.2286.8790-16.4188B1=16.2, B2=15.5, I=14.2, R1=14.6, R2=14.6USNO-B1Query vizier around this object
15.2286.8790-16.4190h=12.3, j=12.9, k=12.22MASSQuery vizier around this object
15.3286.8855-16.4152B1=18.8, B2=18.1, I=17.1, R1=17.5, R2=17.1USNO-B1Query vizier around this object
16.1286.8881-16.4191B1=19.7, B2=18.9, R1=18.7, R2=18.4USNO-B1Query vizier around this object
17.1286.8822-16.4143B1=19.5, B2=19.2, R2=18.5USNO-B1Query vizier around this object
18.3286.8841-16.4239B1=19.7, I=17.2, R1=17.8, R2=17.4USNO-B1Query vizier around this object

Queried USNO-B1, SDSS, 2MASS.

There are 926 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.