Swift Trigger: 1253910

Presumed name: GRB 240912A

BAT	08^h 18^m 31.92^s, +33° 59′ 42.0″
position:	(124.633, +33.995 ± 180″)
XRT	08^h 18^m 32.63^s, +33° 59′ 55.2″
position:	(124.63595, 33.99867 ± 3.5″)
UVOT	08^h 18^m 32.40^s, +33° 59′ 56.0″
position:	(124.6350, +33.9989 ± 0.8″)
Galactic N_HI:	4.67×10²⁰ cm^-2
Galactic E(B-V):	0.053 mag

Best RA:	08^h 18^m 32.40^s	= 124.6350 d
Best Dec:	+33° 59′ 56.0″	= +33.9989 d

Gal Lat:	31.92
Gal Long:	188.03

Sun angle:	51.80°, 3.0 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 3 SPER messages, and 1 objects have been found

- Object 1
- RA (J2000) : 08 18 32.63 ( 124.63595)
- Dec (J2000): +33 59 55.2 ( 33.99867)
- Error (90%): 3.500"
- Counts in Source: 161

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
27.6	124.6395	34.0057	FIRST J081833.4+340020
77.8	124.6314	34.0199	NVSS J081832+340049
110.2	124.6406	34.0290	TYC 2478-262-1	B=11.43, G=10.723172, H=9.516, J=9.802, K=9.505, V=10.82
139.9	124.6716	33.9735	SDSS J081841.19+335824.6	g=22.0466, i=21.6081, r=22.1768, u=22.2833, z=21.4814
153.1	124.6283	34.0407	SDSS J081830.78+340226.6	G=20.444807, g=20.5974, i=20.1758, r=20.5628, u=21.0913, z=20.0223
166.5	124.6478	34.0439	FIRST J081835.4+340237
186.3	124.6082	34.0450	FIRST J081825.9+340242
191.8	124.6254	33.9461	FIRST J081830.0+335646

There are 8 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*	Redshift		Catalogue
19.0	124.6400	34.0019			NED
20.3	124.6292	33.9961		Mag=23.3	NED
28.0	124.6396	34.0058			NED
28.8	124.6342	34.0065		B=21.2, R=20.0	APM-N
31.6	124.6400	33.9911			NED
33.1	124.6296	34.0062		R=26.7, g=25.4, i=24.6, u=21.6, z=21.8	SDSS
33.5	124.6388	34.0078			NED
35.6	124.6379	34.0084		R=23.4, g=24.1, i=21.8, u=23.9, z=21.0	SDSS
36.6	124.6312	34.0086	0.000044	Mag=20.2	NED
36.7	124.6315	34.0082		B1=20.7, R1=18.6	USNO-B1

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

There are 608 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
22.4	124.6291	33.9961	I=21.0, R=21.8, g=23.4, u=24.6, z=20.8	SDSS
22.5	124.6291	33.9961	I=21.0, R=21.7, g=23.2, u=23.7, z=20.7	SDSS
30.2	124.6407	33.9913	I=22.6, R=24.3, g=25.3, u=24.9, z=21.4	SDSS
35.6	124.6379	34.0084	I=21.9, R=23.5, g=24.4, u=25.7, z=22.1	SDSS
37.8	124.6311	34.0084	h=15.8, j=16.5, k=15.6	2MASS
37.9	124.6312	34.0084	I=18.2, R=18.8, g=20.2, u=22.7, z=17.9	SDSS
38.0	124.6312	34.0085	B1=20.6, B2=20.4, I=17.7, R1=19.0, R2=18.6	USNO-B1
38.0	124.6312	34.0085	I=18.2, R=18.8, g=20.2, u=23.0, z=17.9	SDSS
42.6	124.6289	34.0090	I=25.9, R=26.3, g=24.2, u=21.9, z=22.7	SDSS
60.0	124.6527	34.0079	I=19.8, R=19.9, g=20.3, u=21.4, z=19.7	SDSS

Queried USNO-B1, SDSS, 2MASS.

There are 307 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.