Swift Trigger: 1280056

Presumed name: GRB 250108B

BAT	13^h 25^m 11.28^s, +25° 36′ 46.8″
position:	(201.297, +25.613 ± 180″)
XRT	13^h 25^m 18.45^s, +25° 36′ 55.5″
position:	(201.32686, 25.61541 ± 2.0″)
UVOT	No position available.
Galactic N_HI:	1.11×10²⁰ cm^-2
Galactic E(B-V):	0.013 mag

Best RA:	13^h 25^m 18.45^s	= 201.32686 d
Best Dec:	+25° 36′ 55.5″	= 25.61541 d

Gal Lat:	82.27
Gal Long:	23.56

Sun angle:	97.93°, 5.9 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.

XRT SPER data

SPER results page for this trigger.

There are 4 SPER messages, and 1 objects have been found

- Object 1 - enhanced position.
- RA (J2000) : 13 25 18.40 (25.61471)
- Dec (J2000): +25 36 53.0 ( 25.61588)
- Error (90%): 2.0
- Counts in Source: 280

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
43.0	201.3144	25.6195	Gaia DR2 1446758707161310848	G=16.1120
87.2	201.3106	25.6347	H-ATLAS J132514.6+253805
169.2	201.2954	25.5779	2MASX J13251095+2534407	G=19.941425, H=13.274, J=14.297, K=12.871, g=17.328, i=15.995, r=16.491, u=19.009, z=15.638
187.5	201.2918	25.5740	SDSS J132510.03+253426.6	G=21.358942, g=17.882, i=17.331, r=17.680, u=18.603, z=17.339
189.1	201.3040	25.6637	Gaia DR3 1446762143135149312	G=17.853497
198.8	201.2883	25.5725	SDSSCGA 562

There are 6 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
10.4	201.3262	25.6125		NED
17.6	201.3280	25.6202	B2=20.8, I=18.9, R1=19.5, R2=19.6	USNO-B1
17.6	201.3280	25.6202	R=19.7, g=20.8, i=19.2, u=22.4, z=18.7	SDSS
17.6	201.3279	25.6203	Mag=20.7	NED
25.4	201.3325	25.6203	R=21.8, g=24.9, i=21.3, u=24.1, z=24.2	SDSS
25.4	201.3325	25.6203	Mag=23.1	NED
26.5	201.3321	25.6097	Mag=23.0	NED
29.1	201.3342	25.6108		NED
30.4	201.3281	25.6238	R=23.9, g=23.9, i=22.1, u=24.0, z=23.2	SDSS
32.5	201.3196	25.6089	Mag=21.7	NED

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

There are 484 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
26.5	201.3320	25.6097	I=24.2, R=22.3, g=23.0, u=22.9, z=22.6	SDSS
27.0	201.3190	25.6178	I=23.9, R=23.5, g=24.9, u=22.1, z=22.9	SDSS
38.6	201.3332	25.6063	I=20.9, R=21.0, g=21.8, u=24.1, z=20.8	SDSS
43.0	201.3144	25.6195	B1=16.6, B2=17.2, I=14.5, R1=15.9, R2=16.3	USNO-B1
43.0	201.3144	25.6195	I=16.0, R=16.1, g=16.3, u=17.2, z=16.0	SDSS
43.1	201.3144	25.6196	h=15.1, j=15.3, k=15.0	2MASS
47.4	201.3312	25.6028	I=22.0, R=22.5, g=23.4, u=25.6, z=21.8	SDSS
48.9	201.3279	25.6290	I=22.4, R=22.6, g=23.8, u=24.4, z=21.8	SDSS
49.8	201.3216	25.6024	I=22.8, R=22.8, g=23.5, u=23.2, z=21.4	SDSS
55.2	201.3318	25.6008	B1=20.1, B2=20.4, I=17.6, R1=17.8, R2=18.6	USNO-B1

Queried USNO-B1, SDSS, 2MASS.

There are 174 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.