Swift Trigger: 539563

Presumed name: GRB 121125A

BAT	15^h 14^m 04.80^s, +55° 19′ 19.2″
position:	(228.520, +55.322 ± 180″)
XRT	15^h 14^m 06.77^s, +55° 18′ 49.3″
position:	(228.5282, 55.3137 ± 2.4″)
UVOT	15^h 14^m 06.53^s, +55° 18′ 47.9″
position:	(228.5272, +55.3133 ± 0.7″)
Galactic N_HI:	1.27×10²⁰ cm^-2
Galactic E(B-V):	NED unavailable

Best RA:	15^h 14^m 06.53^s	= 228.5272 d
Best Dec:	+55° 18′ 47.9″	= +55.3133 d

Gal Lat:	51.85
Gal Long:	90.44

Sun angle:	76.91°, 0.9 hr West

¹Sper #2 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

u image

white image

Blink images with DSS (link via GSFC)

XRT SPER data

SPER results page for this trigger.

There are 3 SPER messages, and 1 objects have been found

- Object 1 - enhanced position.
- RA (J2000) : 15 14 06.78 (55.3137)
- Dec (J2000): +55 18 49.4 ( 55.31360)
- Error (90%): 2.4
- Counts in Source: 260

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	Source	Misc
0.2′′	228.52725	55.31333	GCN #13993	GRB 121125A: Swift detection of a burst with optical counterpart
0.5′′	228.52742	55.31333	GCN #14002	GRB 121125A: Swift/UVOT Detection
0.5′′	228.52744	55.31332	GCN #13995	GRB 121125A: LOAO Observation
1.7′′	228.52804	55.31336	GCN #13998	GRB 121125A: Enhanced Swift-XRT position
22.7′′	228.51917	55.31764	GCN #13996	GRB 121125A: Swift-BAT refined analysis

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).

SIMBAD

	RA*	Dec*	SIMBAD name		Query
172.4	228.5958	55.3422	NVSS J151423+552033

* 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
9.1	228.5296	55.3111	Mag=17.6	NED
24.2	228.5158	55.3114	Mag=22.0	NED
26.7	228.5158	55.3114	R=21.7, g=22.3, i=21.3, u=22.8, z=22.5	SDSS
27.1	228.5183	55.3078	Mag=22.9	NED
29.5	228.5184	55.3077	R=22.0, g=23.6, i=21.4, u=24.1, z=21.0	SDSS
33.9	228.5142	55.3075	Mag=23.5	NED
34.6	228.5448	55.3119	R=19.5, g=20.4, i=19.1, u=21.3, z=18.7	SDSS
34.7	228.5448	55.3117	B=21.5, R=19.9	APM-N
36.4	228.5446	55.3119	Mag=20.3	NED
36.4	228.5141	55.3075	R=21.9, g=23.4, i=20.8, u=23.9, z=20.5	SDSS

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

There are 319 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
9.5	228.5296	55.3112	I=16.4, R=16.7, g=17.6, u=19.6, z=16.3	SDSS
9.6	228.5298	55.3112	B1=18.5, B2=17.6, I=16.0, R1=16.3, R2=16.1	USNO-B1
9.6	228.5296	55.3112	h=14.7, j=15.2, k=14.5	2MASS
33.0	228.5440	55.3118	B2=20.9, R2=19.2	USNO-B1
34.1	228.5446	55.3121	B2=20.2, I=18.7, R2=19.6	USNO-B1
34.3	228.5446	55.3118	B1=20.9, B2=20.7, I=18.3, R1=19.5, R2=19.3	USNO-B1
37.5	228.5361	55.3043	I=22.9, R=22.7, g=25.0, u=24.9, z=22.1	SDSS
43.4	228.5194	55.3246	B1=20.9, I=19.1, R1=19.8, R2=20.1	USNO-B1
43.4	228.5192	55.3246	I=19.2, R=19.9, g=21.3, u=25.4, z=18.8	SDSS
44.5	228.5185	55.3248	B1=21.0, B2=21.2, R2=20.4	USNO-B1

Queried USNO-B1, SDSS, 2MASS.

There are 203 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.