Swift Trigger: 1090472

Presumed name: GRB 211221A

BAT	05^h 15^m 45.12^s, +00° 56′ 24.0″
position:	(78.938, +0.940 ± 180″)
XRT	05^h 15^m 35.57^s, +00° 54′ 51.2″
position:	(78.89820, 0.91421 ± 3.7″)
UVOT	No position available.
Galactic N_HI:	9.54×10²⁰ cm^-2
Galactic E(B-V):	0.122 mag

Best RA:	05^h 15^m 35.57^s	= 78.89820 d
Best Dec:	+00° 54′ 51.2″	= 0.91421 d

Gal Lat:	-20.74
Gal Long:	200.62

Sun angle:	155.12°, -11.3 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
- RA (J2000) : 05 15 35.61 ( 78.89836)
- Dec (J2000): +00 54 51.9 ( 0.91443)
- Error (90%): 3.500"
- Counts in Source: 455

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	Source	Misc
0.0′′	78.89820	0.91421	GCN #31273	GRB 211221A: Swift detection of a burst
2.9′′	78.89746	0.91450	GCN #31275	GRB 211221A: Enhanced Swift-XRT position
52.2′′	78.90600	0.90200	GCN #31289	GRB 211221A: Swift-BAT refined analysis

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

* RA/Dec in equinox J2000

X-ray sources

	RA*	Dec*		Source table²
61.0	78.8900	0.9290	0.00611374 +/- 0.00107168	XMM-NEWTON
80.7	78.9024	0.9362	0.0039833 +/- 0.000820428	XMM-NEWTON
90.5	78.8856	0.9359	0.00340357 +/- 0.000905043	XMM-NEWTON
114.4	78.8823	0.8867	0.0047862 +/- 0.00133208	XMM-NEWTON
134.9	78.8924	0.9512	0.00423638 +/- 0.00097032	XMM-NEWTON
173.1	78.8505	0.9082	0.0145149 +/- 0.00168867	XMM-NEWTON
176.8	78.9415	0.9374	0.00894301 +/- 0.00122989	XMM-NEWTON
184.0	78.9179	0.8670	0.00397823 +/- 0.000997164	XMM-NEWTON
184.3	78.9177	0.8669	0.00838502 +/- 0.00127306	XMM-NEWTON
185.6	78.9391	0.8827	0.00671424 +/- 0.00150189	XMM-NEWTON

Queried the X-ray MASTER catalogue.

There are 10 X-ray sources within the position error. The full list is here.

* RA/Dec in equinox J2000

¹Energy band for count-rate is mission specific.

Galaxies

	RA*	Dec*	Redshift		Catalogue
10.8	78.8996	0.9167			NED
16.6	78.8954	0.9181			NED
19.1	78.8929	0.9136			NED
19.3	78.8929	0.9136		B=21.7, R2=19.9	SSS
19.4	78.8928	0.9136		R1=18.6, R2=19.3	USNO-B1
19.6	78.8929	0.9136	0.452100		NED
19.6	78.8929	0.9136			NED
19.6	78.8928	0.9135		B=21.3, R=19.4	APM-N
27.0	78.9033	0.9194			NED
27.9	78.9033	0.9083			NED

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

There are 279 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
20.6	78.8934	0.9111	R1=19.2, R2=19.9	USNO-B1
27.4	78.9031	0.9084	B1=17.6, B2=17.5, I=16.9, R1=17.2, R2=16.9	USNO-B1
27.9	78.9032	0.9083	h=15.8, j=16.5, k=15.7	2MASS
30.2	78.9064	0.9124	B1=19.5, B2=19.4, R1=18.9, R2=18.9	USNO-B1
40.8	78.9062	0.9222	B1=18.5, B2=18.1, I=17.2, R1=17.4, R2=17.1	USNO-B1
41.2	78.9063	0.9223	h=15.9, j=16.3, k=15.5	2MASS
48.6	78.8889	0.9240	h=14.2, j=14.5, k=14.1	2MASS
61.9	78.8810	0.9142	h=12.4, j=12.6, k=12.2	2MASS
62.0	78.8810	0.9142	B1=14.2, B2=13.8, I=12.7, R1=13.3, R2=13.5	USNO-B1
70.8	78.9103	0.8987	B1=20.6, I=18.4, R1=19.2, R2=19.4	USNO-B1

Queried USNO-B1, SDSS, 2MASS.

There are 136 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.