Swift Trigger: 1031297;

Presumed name: GRB 210207B

BAT	18^h 02^m 19.68^s, +53° 41′ 38.4″
position:	(270.582, +53.694 ± 180″)
XRT	18^h 02^m 32.54^s, +53° 41′ 01.0″
position:	(270.6356, 53.6836 ± 4.7″)
UVOT	18^h 02^m 32.40^s, +53° 40′ 55.9″
position:	(270.6350, +53.6822 ± 0.7″)
Galactic N_HI:	3.11×10⁰ cm^-2
Galactic E(B-V):	0.037 mag

Best RA:	18^h 02^m 32.40^s	= 270.6350 d
Best Dec:	+53° 40′ 55.9″	= +53.6822 d

Gal Lat:	28.62
Gal Long:	81.68

Sun angle:	81.35°, 3.4 hr West

¹Sper #0 auto processing.

Galaxies within 3.33 of UVOT position

	RA*	Dec*		Catalogue
9.5	270.6320	53.6803	B1=20.7, B2=21.3, I=18.5, R2=19.4	USNO-B1
9.7	270.6317	53.6803		NED
9.8	270.6317	53.6803	B=20.9, R=19.2	APM-N
16.6	270.6425	53.6825		NED
19.1	270.6354	53.6875		NED
25.0	270.6254	53.6781		NED
28.7	270.6483	53.6828		NED
33.4	270.6196	53.6806		NED
33.5	270.6454	53.6753		NED
33.8	270.6321	53.6731		NED
38.5	270.6508	53.6769		NED
39.1	270.6263	53.6917		NED
45.3	270.6517	53.6900		NED
48.1	270.6475	53.6933		NED
49.1	270.6392	53.6956		NED
49.4	270.6188	53.6922		NED
50.6	270.6396	53.6683		NED
50.7	270.6458	53.6697		NED
53.6	270.6538	53.6725		NED
54.2	270.6442	53.6961		NED
54.5	270.6600	53.6800		NED
56.1	270.6561	53.6729	B1=20.7, B2=21.1, R2=19.7	USNO-B1
56.2	270.6580	53.6898	B=21.0, R=18.3	APM-N
56.3	270.6579	53.6897		NED
56.8	270.6208	53.6686		NED
57.2	270.6087	53.6789		NED
57.3	270.6207	53.6687	B=17.9, R=17.2	APM-N
59.8	270.6625	53.6853		NED
60.2	270.6279	53.6661		NED
60.5	270.6083	53.6881		NED
62.8	270.6642	53.6822		NED
63.9	270.6450	53.6989		NED
64.4	270.6522	53.6969	B=21.8, R=20.0	APM-N
65.6	270.6400	53.7003		NED
65.8	270.6196	53.6981		NED
67.0	270.6042	53.6783		NED
68.8	270.6087	53.6711		NED
69.3	270.6338	53.6631		NED
70.3	270.6642	53.6733		NED
71.9	270.6675	53.6772		NED
72.1	270.6308	53.6622		NED
72.6	270.6679	53.6875		NED
73.2	270.6338	53.6619		NED
73.2	270.6167	53.6650		NED
74.8	270.6113	53.6669		NED
76.6	270.6000	53.6769		NED
77.7	270.6200	53.6625		NED
78.9	270.6382	53.6604	B=19.8, R=18.2	APM-N
80.3	270.5975	53.6789		NED
80.9	270.6240	53.6607	B1=20.8, R2=19.8	USNO-B1
80.9	270.6025	53.6939		NED
81.4	270.6421	53.6600		NED
82.0	270.6238	53.6603		NED
82.0	270.6054	53.6678		NED
82.4	270.6358	53.6594		NED
82.9	270.5962	53.6842		NED
82.9	270.6642	53.6972		NED
88.0	270.6328	53.6578	B=21.8, R=19.3	APM-N
88.5	270.6332	53.6576	I=18.4, R1=19.4, R2=19.2	USNO-B1
88.6	270.6333	53.6575		NED
90.3	270.5929	53.6858		NED
90.7	270.5979	53.6699	B2=21.5, R1=19.4, R2=19.8	USNO-B1
90.8	270.5942	53.6750		NED
90.8	270.6675	53.6986		NED
90.8	270.5982	53.6695	B=21.8, R=19.4	APM-N
91.3	270.6771	53.6858		NED
91.3	270.5975	53.6697		NED
91.4	270.5996	53.6679	B1=20.8, R2=18.9	USNO-B1
92.8	270.5971	53.6947		NED
94.3	270.6096	53.6606		NED
95.2	270.6563	53.6589		NED
95.6	270.6063	53.7028		NED
96.0	270.6792	53.6770	B=21.8, R=19.2	APM-N
96.1	270.6792	53.6769		NED
98.0	270.6763	53.6703	B1=20.7, B2=21.9	USNO-B1
99.9	270.6658	53.6614		NED
100.0	270.6092	53.7053		NED
101.7	270.6699	53.6629	B=20.7, R=19.2	APM-N
104.3	270.6046	53.6594		NED
104.3	270.6738	53.6644		NED
104.8	270.6479	53.7103		NED
104.9	270.6044	53.7050	B=20.6, R=18.5	APM-N
105.5	270.6558	53.7088	B=21.7, R=18.8	APM-N
105.8	270.6558	53.7089		NED
106.0	270.5917	53.6967		NED
106.2	270.6560	53.7089	B1=20.8, B2=21.0, I=18.2, R2=19.4	USNO-B1
106.6	270.6408	53.6528		NED
107.0	270.6717	53.7025		NED
107.2	270.6715	53.7027	B2=22.0, I=16.6, R1=19.3, R2=19.4	USNO-B1
108.4	270.6842	53.6900		NED
110.9	270.6679	53.7060	B2=20.6, I=18.5, R2=19.4	USNO-B1
110.9	270.6679	53.7061		NED
111.1	270.6757	53.7015	B=20.0, R=18.6	APM-N
111.4	270.5840	53.6889	B=21.8, R=20.0	APM-N
111.4	270.6680	53.7062	B=21.8, R=19.1	APM-N
111.5	270.6250	53.6518	B=21.4, R=18.3	APM-N
111.8	270.6250	53.6517		NED
112.2	270.6763	53.7017		NED
112.2	270.6650	53.6567		NED
112.4	270.5867	53.6944		NED
113.0	270.6542	53.6531		NED
113.2	270.5820	53.6805	B=21.8, R=19.9	APM-N
113.4	270.6279	53.7133		NED
114.9	270.6854	53.6936		NED
115.2	270.6604	53.7103		NED
115.5	270.5829	53.6733		NED
115.9	270.6350	53.6500		NED
116.0	270.6042	53.6556	B1=20.8, R1=19.6	USNO-B1
116.3	270.6883	53.6756		NED
116.9	270.6051	53.6550	B1=20.6, B2=20.0, I=17.4, R1=18.8, R2=18.4	USNO-B1
117.0	270.6085	53.6537	B=21.8, R=19.6	APM-N
117.1	270.6049	53.6550	B=20.4, R=18.2	APM-N
117.2	270.6050	53.6550		NED
117.5	270.5825	53.6722		NED
117.7	270.6125	53.6522		NED
118.2	270.5929	53.7036		NED
119.0	270.5983	53.7072		NED
119.9	270.6867	53.6694		NED
120.3	270.6750	53.6589		NED
120.6	270.6913	53.6856		NED
121.0	270.5908	53.6612	B1=20.8, R1=19.8	USNO-B1
121.1	270.5967	53.6572		NED
121.1	270.5908	53.6611		NED
123.0	270.5775	53.6842		NED
123.1	270.6924	53.6858	B1=19.2, B2=17.4, I=14.3, R1=16.6	USNO-B1
123.4	270.6926	53.6858	B=19.0, R=15.6	APM-N
124.6	270.6825	53.7022		NED
124.6	270.6021	53.7108		NED
124.8	270.6828	53.7022	B=19.9, R=17.2	APM-N
124.9	270.6933	53.6858		NED
125.5	270.6935	53.6859	h=14.2, j=14.9, k=13.5	2MASS
125.7	270.6059	53.7126	I=18.6, R1=19.7, R2=19.8	USNO-B1
125.9	270.6721	53.6550		NED
126.2	270.6450	53.7167		NED
126.4	270.6058	53.7128		NED
127.3	270.6096	53.6503		NED
128.8	270.5796	53.6967		NED
130.1	270.6938	53.6922		NED
130.3	270.6650	53.7137	B1=20.4, B2=20.8, I=16.9, R1=18.3, R2=18.4	USNO-B1
130.6	270.6650	53.7136		NED
131.5	270.6483	53.6467		NED
131.9	270.6246	53.6461		NED
132.2	270.6245	53.6460	B=21.4, R=18.4	APM-N
132.7	270.6071	53.7153		NED
133.1	270.6592	53.6481		NED
133.7	270.6304	53.7192		NED
133.8	270.6303	53.7193	B=17.0, R=16.0	APM-N
134.5	270.6813	53.6567		NED
135.3	270.6929	53.6669		NED
136.3	270.5996	53.6506		NED
136.6	270.5796	53.6631		NED
136.8	270.6372	53.7202	B1=20.1, B2=20.7, I=17.9, R1=18.3, R2=18.6	USNO-B1
137.0	270.6370	53.7202	B=20.2, R=17.7	APM-N
137.1	270.6104	53.7175		NED
137.2	270.6371	53.7203		NED
137.2	270.6992	53.6850		NED
138.5	270.5913	53.6539		NED
139.7	270.6607	53.6465	B2=22.0, R2=19.8	USNO-B1
139.7	270.6575	53.6458		NED
139.9	270.6142	53.6453		NED
140.4	270.6458	53.6439		NED
141.1	270.6983	53.6714		NED
141.1	270.5700	53.6742		NED
141.2	270.6140	53.6450	B1=20.4, B2=20.6, I=18.4, R1=19.7, R2=19.4	USNO-B1
141.4	270.5700	53.6742	B=21.8, R=18.6	APM-N
141.7	270.5817	53.7058		NED
143.1	270.6946	53.7003		NED
143.1	270.5763	53.7014		NED
143.1	270.6800	53.6528		NED
143.5	270.6263	53.6428		NED
145.7	270.6708	53.6478		NED
145.8	270.5667	53.6842		NED
146.0	270.5709	53.6966	B1=20.6, B2=21.4, R2=19.7	USNO-B1
146.5	270.5829	53.6558		NED
147.0	270.6408	53.6414		NED
147.1	270.6721	53.7167		NED
147.4	270.6721	53.7167	B=19.7, R=17.3	APM-N
147.6	270.5822	53.6557	B=21.8, R=19.3	APM-N
148.4	270.5808	53.7083		NED
148.5	270.6018	53.7185	B1=19.5, B2=19.1, I=16.7, R1=18.1, R2=17.6	USNO-B1
148.5	270.7041	53.6874	B=20.3, R=18.6	APM-N
148.7	270.6015	53.7184	B=20.0, R=17.7	APM-N
148.9	270.6025	53.7189		NED
148.9	270.7029	53.6914		NED
150.4	270.7050	53.6878		NED
150.9	270.6542	53.7225	B=21.3, R=20.0	APM-N
151.7	270.6917	53.6569		NED
151.7	270.6300	53.6402	B1=17.9, B2=17.9, I=16.0, R1=16.9, R2=17.2	USNO-B1
151.7	270.6333	53.7244		NED
151.8	270.6875	53.6539		NED
151.8	270.5864	53.7130	B=20.6, R=19.3	APM-N
151.9	270.6542	53.7228		NED
152.1	270.6221	53.7236		NED
152.2	270.5863	53.7133		NED
152.2	270.6300	53.6400		NED
152.9	270.6033	53.6442		NED
153.1	270.5850	53.6517		NED
153.4	270.5929	53.7169		NED
153.5	270.5932	53.7169	B2=21.5, I=17.8, R1=19.3, R2=19.1	USNO-B1
154.2	270.6542	53.6408		NED
154.4	270.5808	53.7106		NED
155.6	270.5621	53.6811		NED
155.7	270.6150	53.6406		NED
156.3	270.5934	53.6464	B=19.4, R=16.3	APM-N
156.4	270.6904	53.7106		NED
158.0	270.5925	53.6461		NED
158.0	270.6913	53.6536		NED
158.2	270.6200	53.6392		NED
158.9	270.6383	53.7264		NED
159.1	270.6988	53.6594		NED
159.2	270.5625	53.6928		NED
160.4	270.5600	53.6850		NED
160.5	270.5900	53.7181		NED
161.7	270.6150	53.7256		NED
162.2	270.6254	53.7269		NED
162.8	270.6529	53.7261		NED
164.1	270.5667	53.7033		NED
164.5	270.6646	53.7244		NED
164.6	270.6617	53.6394		NED
164.9	270.6618	53.6392	B=21.8, R=19.6	APM-N
165.5	270.7125	53.6800		NED
165.6	270.5633	53.7000		NED
166.1	270.5915	53.6439	B1=20.8, B2=21.8, I=18.5, R2=19.5	USNO-B1
166.2	270.7129	53.6833		NED
166.9	270.6888	53.6486		NED
168.0	270.6893	53.6484	B=21.8, R=19.5	APM-N
169.2	270.5954	53.6414		NED
170.2	270.7021	53.7078		NED
170.3	270.6742	53.6411		NED
171.2	270.6800	53.7217		NED
171.4	270.5954	53.7236		NED
171.8	270.5850	53.7197		NED
171.9	270.6429	53.6347		NED
172.1	270.6983	53.6528		NED
172.2	270.6982	53.6525	B=15.6, R=14.3	APM-N
172.8	270.6700	53.6389		NED
173.6	270.7133	53.6953		NED
175.2	270.6029	53.6375		NED
175.4	270.6899	53.7185	I=18.7, R2=19.7	USNO-B1
175.4	270.6900	53.7183		NED
175.7	270.6617	53.7283		NED
175.8	270.5538	53.6903		NED
176.2	270.5718	53.6507	I=18.8, R2=19.7	USNO-B1
176.2	270.6254	53.7308		NED
176.5	270.6313	53.7311		NED
176.8	270.5521	53.6803		NED
176.8	270.7121	53.6642		NED
177.2	270.5717	53.6503		NED
177.3	270.7123	53.6641	B2=22.1, R2=19.7	USNO-B1
177.7	270.5521	53.6767		NED
177.8	270.5558	53.6981		NED
178.7	270.6000	53.7272		NED
178.7	270.6712	53.7269		NED
179.3	270.5892	53.7239		NED
179.9	270.7179	53.6739		NED
180.7	270.5543	53.6975	B=19.1, R=20.0	APM-N
180.7	270.5538	53.6969		NED
181.1	270.7199	53.6819	B=21.7, R=19.3	APM-N
181.3	270.6704	53.7280	B1=20.8, B2=21.9, R2=19.7	USNO-B1
181.6	270.6504	53.6325		NED
181.7	270.7200	53.6819		NED
181.8	270.5642	53.7103		NED
181.9	270.5976	53.6368	B=21.8, R=19.9	APM-N
183.4	270.6967	53.6467		NED
183.5	270.5596	53.7067		NED
184.4	270.5550	53.7017		NED
184.6	270.7175	53.6972		NED
185.0	270.6079	53.6333		NED
186.4	270.6167	53.7328		NED
186.7	270.7212	53.6728		NED
188.1	270.6988	53.7181		NED
188.1	270.7096	53.6542		NED
188.7	270.5771	53.6426	B=21.6, R=19.7	APM-N
188.9	270.7063	53.7133		NED
189.2	270.5767	53.6425		NED
189.5	270.6558	53.6311		NED
189.9	270.7108	53.7097		NED
190.9	270.7229	53.6928		NED
191.2	270.7050	53.6492		NED
192.1	270.5488	53.6978		NED
192.3	270.7172	53.7043	B1=20.6, B2=20.3	USNO-B1
192.8	270.7170	53.7048	B=19.5, R=17.6	APM-N
193.0	270.7171	53.7047		NED
193.0	270.6963	53.7217		NED
193.1	270.7246	53.6897		NED
193.3	270.6796	53.7289		NED
193.4	270.7249	53.6896	R1=19.6, R2=19.8	USNO-B1
193.5	270.7249	53.6894	B=21.8, R=19.4	APM-N
193.5	270.5904	53.6353		NED
193.8	270.6100	53.7339		NED
194.2	270.6571	53.7344		NED
194.3	270.5500	53.7017		NED
194.4	270.5958	53.6333		NED
194.7	270.5664	53.7179	I=18.2, R1=19.7, R2=19.7	USNO-B1
194.9	270.6725	53.7314		NED
195.0	270.5663	53.7178		NED
195.1	270.7233	53.6681		NED
195.2	270.5600	53.6508		NED
195.4	270.6946	53.6408		NED
195.5	270.5600	53.6508		NED
196.7	270.5692	53.7206		NED
196.8	270.5783	53.7253		NED
196.9	270.5775	53.6394		NED
198.5	270.6700	53.6311		NED
198.5	270.6396	53.6272		NED
199.5	270.7038	53.6447		NED
199.5	270.5417	53.6856		NED

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

* 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