Swift Trigger: 1031636

Presumed name: GRB 210209A

BAT	21^h 52^m 23.04^s, +43° 33′ 32.4″
position:	(328.096, +43.559 ± 180″)
XRT	21^h 52^m 29.72^s, +43° 33′ 25.6″
position:	(328.12384, 43.55710 ± 3.5″)
UVOT	No position available.
Galactic N_HI:	2.34×10⁰ cm^-2
Galactic E(B-V):	0.335 mag

Best RA:	21^h 52^m 29.72^s	= 328.12384 d
Best Dec:	+43° 33′ 25.6″	= 43.55710 d

Gal Lat:	-8.28
Gal Long:	91.91

Sun angle:	58.19°, -0.3 hr East of Sun

¹Sper #6 auto processing.

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) : 21 52 29.72 ( 328.12384)
- Dec (J2000): +43 33 25.6 ( 43.55710)
- Error (90%): 3.500"
- Counts in Source: 374

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
2.5′′	328.12300	43.55744	GCN #29442	GRB 210209A: Swift detection of a burst
4.2′′	328.12225	43.55698	GCN #29443	GRB 210209A: Enhanced Swift-XRT position
82.5′′	328.09700	43.54500	GCN #29479	GRB 210209A: Swift-BAT refined analysis

Catalogue Searches. Searched 3.33′ 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
75.5	328.1315	43.5369	TYC 3197-2086-2	B=12.99, V=12.18
76.4	328.1311	43.5365	TYC 3197-2086-1	B=11.26, G=10.510, H=9.102, J=9.469, K=9.152, V=10.76
88.5	328.1575	43.5539	TYC 3197-2141-1	B=12.87, G=10.1285, H=6.452, J=7.302, K=6.153, V=11.20
164.8	328.1762	43.5314	TYC 3197-2246-1	B=11.68, G=11.2249, H=10.29, J=10.451, K=10.223, V=11.09

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
11.6	328.1238	43.5603		NED
11.9	328.1237	43.5604	I=15.1, R1=16.3, R2=16.2	USNO-B1
12.3	328.1233	43.5605	B1=17.8, B2=18.2, I=16.4, R2=17.9	USNO-B1
20.0	328.1304	43.5542		NED
20.3	328.1292	43.5531		NED
20.7	328.1183	43.5614		NED
21.3	328.1194	43.5620	I=18.3, R1=18.9	USNO-B1
24.4	328.1207	43.5507	B1=21.0, B2=20.5, I=17.9, R1=19.0	USNO-B1
35.5	328.1342	43.5508		NED
36.2	328.1363	43.5614		NED

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

There are 431 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
11.6	328.1240	43.5603	h=14.6, j=15.1, k=14.4	2MASS
19.9	328.1303	43.5541	B1=15.2, B2=15.4, I=12.4, R1=14.2, R2=13.6	USNO-B1
20.0	328.1304	43.5542	h=11.3, j=12.0, k=11.2	2MASS
20.3	328.1292	43.5530	h=15.7, j=15.9, k=13.2	2MASS
20.7	328.1184	43.5613	h=15.9, j=16.7, k=16.6	2MASS
21.1	328.1183	43.5614	B2=20.7, I=17.9, R1=18.7, R2=18.7	USNO-B1
25.6	328.1180	43.5514	B1=19.9, B2=20.4, I=18.0, R1=18.3, R2=18.5	USNO-B1
26.5	328.1304	43.5627	B1=20.9, B2=20.5, I=18.1, R1=18.6, R2=18.7	USNO-B1
28.2	328.1301	43.5507	B1=17.6, B2=20.6, R1=19.2	USNO-B1
29.9	328.1280	43.5648	B1=21.1, B2=20.7, I=18.3, R1=19.5, R2=19.0	USNO-B1

Queried USNO-B1, SDSS, 2MASS.

There are 506 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.