Swift Trigger: 1165948

Presumed name: GRB 230427A

BAT	10^h 13^m 17.76^s, +48° 10′ 48.0″
position:	(153.324, 48.180 ± 180″)
XRT	10^h 13^m 14.88^s, +48° 12′ 14.5″
position:	(153.31199, 48.20404 ± 1.9″)
UVOT	10^h 13^m 15.05^s, +48° 12′ 14.4″
position:	(153.3127, +48.2040 ± 0.7″)
Galactic N_HI:	8.18×10¹⁹ cm^-2
Galactic E(B-V):	0.008 mag

Best RA:	10^h 13^m 15.05^s	= 153.3127 d
Best Dec:	+48° 12′ 14.4″	= +48.2040 d

Gal Lat:	52.88
Gal Long:	167.61

Sun angle:	97.93°, -7.9 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 6 SPER messages, and 1 objects have been found

- Object 1 - enhanced position.
- RA (J2000) : 10 13 14.88 (48.20404)
- Dec (J2000): +48 12 14.6 ( 48.20435)
- Error (90%): 1.9
- Counts in Source: 91

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
127.5	153.2605	48.1952	SDSS J101302.52+481142.7	B=19.3, G=20.506514, R=19.1, g=20.3134, i=20.2741, r=20.1937, u=20.6716, z=19.7774
131.9	153.3645	48.1931	SDSS J101327.47+481135.3	G=20.571600, g=20.6499, i=20.4919, r=20.5794, u=21.1553, z=20.1605
136.2	153.3375	48.2378	2MASS J10132098+4814160	G=17.783718, H=14.589, J=15.192, K=14.375, g=19.588, i=17.124, r=18.187, u=21.896, z=16.529
166.6	153.2454	48.1910	SDSS J101258.88+481127.5	G=21.550545, g=19.580, i=17.180, r=17.809, u=21.973, z=16.815

There are 4 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
12.8	153.3138	48.2075	Mag=23.7	NED
15.6	153.3160	48.2006	B1=20.2, B2=20.5	USNO-B1
18.5	153.3167	48.1994	Mag=19.0	NED
19.5	153.3166	48.1996	R=18.3, g=19.1, i=17.8, u=20.4, z=17.5	SDSS
20.0	153.3167	48.1995	B=19.9, R=18.2	APM-N
28.3	153.3238	48.2041	R=23.1, g=24.4, i=21.6, u=24.2, z=21.3	SDSS
29.8	153.3142	48.1958		NED
32.1	153.3051	48.1964	R=21.4, g=22.5, i=20.6, u=23.2, z=20.0	SDSS
32.3	153.3183	48.2122	Mag=23.3	NED
32.9	153.3050	48.1964	Mag=22.3	NED

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

There are 459 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
13.1	153.3137	48.2075	I=22.4, R=22.5, g=23.6, u=24.9, z=23.4	SDSS
18.8	153.3166	48.1998	B1=19.3, B2=18.9, R1=18.0	USNO-B1
19.7	153.3167	48.1996	B1=18.8, B2=19.1, I=17.5, R1=19.4, R2=18.0	USNO-B1
25.5	153.3215	48.2072	I=25.2, R=25.1, g=23.2, u=25.8, z=22.4	SDSS
40.4	153.3090	48.1930	I=19.5, R=20.8, g=22.3, u=23.7, z=18.9	SDSS
40.5	153.3089	48.1930	I=19.5, R=20.8, g=22.3, u=24.0, z=18.8	SDSS
42.2	153.3168	48.1928	I=21.7, R=22.4, g=23.2, u=24.5, z=21.2	SDSS
43.5	153.3082	48.1922	B1=21.1, I=19.1	USNO-B1
49.9	153.3319	48.2001	I=15.5, R=15.7, g=16.1, u=17.3, z=15.4	SDSS
49.9	153.3320	48.2002	B1=16.0, B2=16.2, I=15.5, R1=15.4, R2=15.6	USNO-B1

Queried USNO-B1, SDSS, 2MASS.

There are 181 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.