Swift Trigger: 1315630

Presumed name: GRB 250520A

BAT	18^h 49^m 04.32^s, -11° 50′ 49.2″
position:	(282.268, -11.847 ± 180″)
XRT	18^h 49^m 08.67^s, -11° 52′ 08.6″
position:	(282.28613, -11.86906 ± 2.0″)
UVOT	No position available.
Galactic N_HI:	2.25×10²¹ cm^-2
Galactic E(B-V):	0.634 mag

Best RA:	18^h 49^m 08.67^s	= 282.28613 d
Best Dec:	-11° 52′ 08.6″	= -11.86906 d

Gal Lat:	-4.88
Gal Long:	22.08

Sun angle:	135.65°, 9.0 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 9 SPER messages, and 1 objects have been found

- Object 1 - enhanced position.
- RA (J2000) : 18 49 08.67 (-11.86906)
- Dec (J2000): -11 52 08.6 ( -11.86806)
- Error (90%): 2.0
- Counts in Source: 143

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
66.7	282.2855	-11.8505	ATO J282.2855-11.8505	B=16.800, G=15.306723, H=12.955, J=13.474, K=12.781, R=15.387, V=15.669, g=16.285, i=14.650
114.9	282.2777	-11.8382	2MASS J18490663-1150176	G=12.831715, H=7.598, J=8.683, K=7.128
120.4	282.2877	-11.9025	Gaia DR3 4105939089510734848	G=19.795019
136.3	282.2883	-11.9069	Gaia DR3 4105939016443377792	G=18.847572
142.4	282.3247	-11.8573	Gaia DR3 4105940734446241792	G=19.214596
147.8	282.2539	-11.8427	TYC 5701-514-1	B=12.49, G=10.398433, H=7.374, J=8.062, K=7.237, V=11.12
158.3	282.2439	-11.8842	TYC 5701-768-1	B=12.31, G=11.635624, H=9.66, J=9.978, K=9.532, V=11.75
166.0	282.2530	-11.8363	2MASS J18490072-1150107	G=15.032411, H=9.947, J=11.083, K=9.578
171.2	282.2482	-11.8988	Gaia DR3 4105942074456967808	G=18.516853

There are 9 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
3.3	282.2855	-11.8684	B=19.8, R2=18.5, i=18.0	SSS
3.4	282.2854	-11.8683		NED
8.6	282.2854	-11.8714		NED
9.7	282.2857	-11.8664	B=21.0, R2=20.0, i=19.3	SSS
14.4	282.2870	-11.8730	I=17.3, R1=17.6, R2=18.1	USNO-B1
15.0	282.2829	-11.8719		NED
15.2	282.2871	-11.8731		NED
15.5	282.2892	-11.8722		NED
15.7	282.2821	-11.8675		NED
16.3	282.2879	-11.8731		NED

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

There are 1174 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
2.4	282.2866	-11.8696	I=19.3, R2=19.9	USNO-B1
3.4	282.2855	-11.8683	B2=19.7, I=18.3, R1=18.2, R2=17.7	USNO-B1
3.4	282.2855	-11.8683	h=15.4, j=16.1, k=15.2	2MASS
8.1	282.2864	-11.8713	B2=20.3, R1=17.8, R2=17.0	USNO-B1
8.2	282.2855	-11.8713	B1=18.5, B2=17.6, I=16.4, R1=16.5, R2=16.6	USNO-B1
8.6	282.2854	-11.8713	h=14.6, j=14.9, k=14.4	2MASS
9.6	282.2837	-11.8678	R1=19.6, R2=21.0	USNO-B1
9.9	282.2857	-11.8664	I=19.1, R1=19.4, R2=19.1	USNO-B1
12.5	282.2826	-11.8688	R1=19.8, R2=19.8	USNO-B1
15.0	282.2830	-11.8719	h=15.5, j=16.0, k=15.3	2MASS

Queried USNO-B1, SDSS, 2MASS.

There are 1885 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.