Swift Trigger: 1222885

Presumed name: GRB 240418A

BAT	15^h 57^m 17.28^s, +23° 36′ 25.2″
position:	(239.322, 23.607 ± 180″)
XRT	15^h 57^m 29.62^s, +23° 35′ 45.9″
position:	(239.37342, 23.59607 ± 1.9″)
UVOT	No position available.
Galactic N_HI:	4.32×10²⁰ cm^-2
Galactic E(B-V):	0.060 mag

Best RA:	15^h 57^m 29.62^s	= 239.37342 d
Best Dec:	+23° 35′ 45.9″	= 23.59607 d

Gal Lat:	48.05
Gal Long:	38.83

Sun angle:	133.00°, 9.8 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 5 SPER messages, and 1 objects have been found

- Object 1 - enhanced position.
- RA (J2000) : 15 57 29.62 (23.59607)
- Dec (J2000): +23 35 45.8 ( 23.59578)
- Error (90%): 1.9
- Counts in Source: 13

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		Query
154.1	239.3777	23.5534	SDSS J155730.65+233312.3	G=17.163370, g=17.135, i=17.352, r=17.235, u=18.493, z=17.368

* 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
8.2	239.3728	23.5983	R=22.7, g=23.6, i=23.1, u=24.0, z=23.1	SDSS
14.7	239.3767	23.5986		NED
14.8	239.3742	23.5919	Mag=23.2	NED
24.2	239.3662	23.5947		NED
27.2	239.3810	23.5990	B=21.6, R=18.9	APM-N
27.6	239.3752	23.5886	R=21.3, g=21.9, i=21.3, u=22.7, z=21.5	SDSS
27.6	239.3751	23.5886	R=21.4, g=22.0, i=21.4, u=23.0, z=21.7	SDSS
27.7	239.3750	23.5886	Mag=22.1	NED
27.7	239.3675	23.5906	R1=18.7, R2=20.6	USNO-B1
28.2	239.3810	23.5996	R=20.5, g=21.4, i=19.9, u=22.2, z=19.8	SDSS

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

There are 577 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
14.7	239.3741	23.5920	I=20.9, R=21.8, g=23.3, u=23.3, z=20.5	SDSS
14.8	239.3740	23.5920	I=21.0, R=21.7, g=23.2, u=23.5, z=20.4	SDSS
18.4	239.3758	23.6007	I=22.7, R=23.0, g=23.2, u=23.4, z=22.7	SDSS
24.8	239.3743	23.5892	B2=21.3, R1=20.1	USNO-B1
28.4	239.3811	23.5996	B2=21.2, R1=20.1, R2=20.5	USNO-B1
38.1	239.3763	23.6063	I=23.9, R=24.3, g=24.8, u=24.4, z=20.7	SDSS
40.6	239.3846	23.5913	R1=18.9, R2=18.6	USNO-B1
42.4	239.3677	23.5855	I=20.1, R=21.7, g=23.2, u=24.8, z=19.1	SDSS
42.5	239.3677	23.5855	I=20.1, R=21.6, g=22.6, u=23.1, z=19.3	SDSS
42.9	239.3620	23.5905	h=13.1, j=13.5, k=13.1	2MASS

Queried USNO-B1, SDSS, 2MASS.

There are 302 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.