Swift Trigger: 1348587

Presumed name: GRB 250911A

BAT	17^h 35^m 02.88^s, -16° 50′ 38.4″
position:	(263.762, -16.844 ± 180″)
XRT	17^h 35^m 00.24^s, -16° 51′ 16.1″
position:	(263.75102, -16.85448 ± 3.7″)
UVOT	No position available.
Galactic N_HI:	2.08×10²¹ cm^-2
Galactic E(B-V):	0.446 mag

Best RA:	17^h 35^m 00.24^s	= 263.75102 d
Best Dec:	-16° 51′ 16.1″	= -16.85448 d

Gal Lat:	8.43
Gal Long:	9.02

Sun angle:	95.74°, -6.3 hr East of Sun

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.

XRT SPER data

SPER results page for this trigger.

There are 2 SPER messages, and 1 objects have been found

- Object 1
- RA (J2000) : 17 35 00.24 ( 263.75102)
- Dec (J2000): -16 51 16.1 ( -16.85448)
- Error (90%): 3.659"
- Counts in Source: 265

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	Dec	Date reported	Source	Misc	Query

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).

SIMBAD

	RA*	Dec*	SIMBAD name
53.4	263.7391	-16.8640	Gaia DR3 4124418439649582464	G=19.033192
55.0	263.7535	-16.8696	Gaia DR3 4124419852744076672	G=20.004831
67.0	263.7662	-16.8428	Gaia DR3 4124420058902690816	G=19.817190
96.7	263.7709	-16.8734	OGLE BLG-RRLYR-51541	G=16.254175, I=15.422
97.0	263.7326	-16.8341	Gaia DR3 4124420230719879552	G=17.854713
104.2	263.7337	-16.8782	Gaia DR3 4124418409635125376	G=20.403421
115.8	263.7220	-16.8707	Gaia DR3 4124418615819265664	G=18.294907
137.0	263.7907	-16.8521	TYC 6235-2995-1	B=12.31, G=11.505169, H=9.751, J=10.109, K=9.603, V=11.68
141.9	263.7099	-16.8570	2MASS J17345037-1651253	G=13.006173, H=8.399, J=9.440, K=8.050
158.2	263.7485	-16.8106	Gaia DR3 4124421124073088000	G=18.694368

There are 12 SIMBAD objects within the position error. The full list is here.

* RA/Dec in equinox J2000

X-ray sources

	RA*	Dec*		Source table²	Observatory	Query

Queried the X-ray MASTER catalogue.

* RA/Dec in equinox J2000

¹Energy band for count-rate is mission specific.

Galaxies

	RA*	Dec*		Catalogue
5.0	263.7524	-16.8547	B2=21.1, R2=18.5	USNO-B1
8.2	263.7524	-16.8526	B=19.5, R2=18.3, i=17.8	SSS
9.8	263.7532	-16.8563	B=21.9, R2=19.8	SSS
10.5	263.7531	-16.8523	B2=19.5, R2=17.9	USNO-B1
13.3	263.7517	-16.8581		NED
13.9	263.7542	-16.8522		NED
14.2	263.7483	-16.8575		NED
14.4	263.7544	-16.8521	B=19.1	SSS
14.4	263.7547	-16.8526	B1=16.8, B2=16.4, I=15.3, R1=15.7, R2=14.8	USNO-B1
14.6	263.7470	-16.8558	B2=18.5, R1=17.3, R2=17.7	USNO-B1

Queried APM-N, SDSS, PSCz, SSS, NED, 2MASSX, USNO-B1.

There are 1920 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

Stars

	RA*	Dec*		Catalogue
2.5	263.7516	-16.8540	B2=20.4, R1=20.4, R2=16.5	USNO-B1
4.6	263.7508	-16.8558	B2=18.8, R2=17.6	USNO-B1
7.6	263.7522	-16.8527	B2=18.9, R1=17.4, R2=18.1	USNO-B1
12.7	263.7488	-16.8573	B2=19.1, R1=16.5, R2=17.7	USNO-B1
13.4	263.7517	-16.8581	B1=14.8, B2=15.1, I=13.9, R1=14.0, R2=13.9	USNO-B1
13.4	263.7517	-16.8581	h=12.6, j=13.0, k=12.5	2MASS
13.4	263.7488	-16.8576	B2=19.1, R1=17.0, R2=17.8	USNO-B1
13.9	263.7542	-16.8521	h=14.3, j=15.1, k=14.4	2MASS
14.2	263.7485	-16.8576	h=15.3, j=16.3, k=15.1	2MASS
14.7	263.7545	-16.8522	B1=17.4, I=15.3, R2=15.7	USNO-B1

Queried USNO-B1, SDSS, 2MASS.

There are 1954 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.