Swift Trigger: 1186032

Presumed name: GRB 230818A

BAT	19^h 03^m 31.92^s, +40° 52′ 33.6″
position:	(285.883, 40.876 ± 180″)
XRT	19^h 03^m 33.48^s, +40° 53′ 43.0″
position:	(285.88951, 40.89528 ± 3.7″)
UVOT	No position available.
Galactic N_HI:	7.88×10²⁰ cm^-2
Galactic E(B-V):	0.121 mag

Best RA:	19^h 03^m 33.48^s	= 285.88951 d
Best Dec:	+40° 53′ 43.0″	= 40.89528 d

Gal Lat:	15.25
Gal Long:	71.45

Sun angle:	113.66°, -9.2 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 9 SPER messages, and 1 objects have been found

- Object 1
- RA (J2000) : 19 03 33.49 ( 285.88956)
- Dec (J2000): +40 53 43.2 ( 40.89534)
- Error (90%): 3.601"
- Counts in Source: 192

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
93.2	285.8736	40.9182	Gaia DR3 2103786513292298624	G=20.439234
99.6	285.8574	40.8821	Gaia DR2 2103786311433280768	G=18.748396
141.1	285.9312	40.8720	UCAC4 655-069319	G=14.869158, H=13.187, J=13.648, K=13.168, R=15.007
146.2	285.9176	40.8607	UCAC4 655-069311	B=15.299, G=14.322563, H=12.877, J=13.216, K=12.767, R=14.406, V=14.487, g=14.829, i=14.158, r=14.282
160.7	285.9371	40.8688	TYC 3124-1453-1	B=11.95, G=10.336350, H=7.824, J=8.507, K=7.684, V=10.64
164.5	285.8307	40.9059	Gaia DR3 2103786650731211904	G=20.395521
169.2	285.8418	40.9254	KOI-3784.01
169.2	285.8418	40.9254	KOI-3784	G=14.179164, H=12.753, J=13.076, K=12.707
173.9	285.9053	40.9421	2MASS J19033726+4056316	G=15.477595, H=13.914, J=14.32, K=13.926
177.9	285.9456	40.9206	TYC 3124-797-1	B=10.26, G=9.770664, H=8.748, J=8.983, K=8.697, V=9.83

There are 13 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
10.1	285.8904	40.8925		NED
12.1	285.8850	40.8947		NED
12.3	285.8930	40.8974	B1=20.9, B2=20.7, R1=19.3, R2=19.4	USNO-B1
12.9	285.8892	40.8989		NED
13.1	285.8846	40.8947		NED
17.2	285.8958	40.8944		NED
23.3	285.8958	40.8911		NED
24.2	285.8983	40.8953		NED
26.9	285.8821	40.9003		NED
27.8	285.8796	40.8931		NED

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

There are 276 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
6.5	285.8918	40.8947	B1=21.2, B2=20.4	USNO-B1
12.1	285.8851	40.8947	B1=19.0, B2=19.4, I=16.9, R1=17.5, R2=17.3	USNO-B1
12.1	285.8851	40.8946	h=15.9, j=16.4, k=15.8	2MASS
17.5	285.8851	40.8988	B2=20.6, R1=19.9, R2=19.9	USNO-B1
23.5	285.8960	40.8910	B1=20.4, B2=20.8, I=17.7, R1=18.4, R2=18.5	USNO-B1
24.9	285.8986	40.8957	B1=20.7, B2=20.8, I=18.4, R1=19.1, R2=19.0	USNO-B1
26.6	285.8904	40.9027	B2=20.9, R1=19.6, R2=19.9	USNO-B1
26.8	285.8822	40.9003	B1=20.1, B2=20.2, I=18.0, R1=18.8, R2=18.6	USNO-B1
27.7	285.8798	40.8930	B1=16.3, B2=16.5, I=13.5, R1=14.4, R2=14.7	USNO-B1
27.9	285.8798	40.8929	h=12.6, j=13.1, k=12.6	2MASS

Queried USNO-B1, SDSS, 2MASS.

There are 381 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.