Swift Trigger: 1036227;

Presumed name: GRB 210308A

BAT	04^h 28^m 21.12^s, +37° 24′ 39.6″
position:	(67.088, 37.411 ± 180″)
XRT	04^h 28^m 17.90^s, +37° 26′ 02.8″
position:	(67.0746, 37.4341 ± 2.2″)
UVOT	No position available.
Galactic N_HI:	3.03×10⁰ cm^-2
Galactic E(B-V):	1.269 mag

Best RA:	04^h 28^m 17.90^s	= 67.0746 d
Best Dec:	+37° 26′ 02.8″	= 37.4341 d

Gal Lat:	-7.82
Gal Long:	163.49

Sun angle:	83.90°, -5.2 hr East of Sun

¹Sper #3 auto processing.

Galaxies within 3.33 of XRT position

	RA*	Dec*		Catalogue
4.8	67.0758	37.4331		NED
9.1	67.0775	37.4353		NED
11.2	67.0731	37.4312	I=18.6, R1=19.8, R2=19.8	USNO-B1
11.7	67.0733	37.4311		NED
17.5	67.0688	37.4322		NED
17.5	67.0794	37.4311	B2=20.0, I=17.1, R1=18.2, R2=18.1	USNO-B1
17.8	67.0796	37.4311		NED
18.6	67.0682	37.4331	I=18.6, R1=19.3, R2=20.0	USNO-B1
19.1	67.0679	37.4356		NED
19.4	67.0680	37.4354	I=18.5, R2=20.1	USNO-B1
20.1	67.0712	37.4392		NED
24.5	67.0817	37.4378		NED
25.1	67.0792	37.4283		NED
25.2	67.0792	37.4281	B2=20.7, I=17.6, R1=18.7, R2=18.6	USNO-B1
34.9	67.0846	37.4286		NED
36.8	67.0779	37.4439		NED
37.8	67.0617	37.4364		NED
38.8	67.0675	37.4247		NED
39.8	67.0833	37.4253		NED
41.0	67.0679	37.4442		NED
41.1	67.0622	37.4283	I=18.7, R2=19.1	USNO-B1
42.1	67.0621	37.4278		NED
43.4	67.0637	37.4428		NED
48.8	67.0916	37.4327	R1=19.4, R2=19.9	USNO-B1
49.9	67.0888	37.4261	I=18.1, R2=20.1	USNO-B1
50.3	67.0917	37.4367		NED
52.6	67.0564	37.4363	I=18.7, R2=19.9	USNO-B1
53.8	67.0633	37.4461		NED
54.1	67.0913	37.4272		NED
54.4	67.0800	37.4197		NED
54.7	67.0567	37.4289		NED
59.8	67.0758	37.4506		NED
60.5	67.0933	37.4264		NED
61.2	67.0938	37.4264		NED
66.5	67.0658	37.4169		NED
68.8	67.0813	37.4158		NED
68.9	67.0975	37.4283		NED
70.3	67.0992	37.4336	I=18.5, R2=20.0	USNO-B1
70.6	67.0992	37.4336		NED
71.3	67.0842	37.4158		NED
72.1	67.0588	37.4186		NED
72.2	67.0500	37.4297		NED
75.8	67.0879	37.4158		NED
76.8	67.0913	37.4174	I=18.3, R1=19.6, R2=19.9	USNO-B1
77.0	67.0625	37.4150		NED
77.8	67.0946	37.4194		NED
78.4	67.0921	37.4172		NED
79.9	67.0871	37.4539		NED
81.0	67.0696	37.4561		NED
82.8	67.0743	37.4571	I=18.7, R2=20.0	USNO-B1
83.5	67.0954	37.4503		NED
83.7	67.0855	37.4125	I=18.6, R1=19.5, R2=19.5	USNO-B1
88.6	67.0646	37.4575		NED
90.1	67.0429	37.4361		NED
90.7	67.0767	37.4089		NED
91.6	67.0488	37.4494		NED
91.7	67.0642	37.4100		NED
93.8	67.0517	37.4528		NED
94.1	67.0446	37.4453		NED
95.4	67.0708	37.4606		NED
95.5	67.0514	37.4532	B1=19.4, B2=18.4, I=15.5, R1=16.7, R2=16.4	USNO-B1
95.8	67.0729	37.4075		NED
95.8	67.1075	37.4297		NED
96.0	67.1067	37.4258		NED
97.0	67.0512	37.4536		NED
97.7	67.1020	37.4178	I=18.3, R1=18.9	USNO-B1
98.5	67.0879	37.4089		NED
98.9	67.0529	37.4125		NED
99.9	67.0529	37.4122		NED
100.1	67.0929	37.4578		NED
100.1	67.0625	37.4081		NED
100.4	67.1025	37.4172		NED
100.6	67.0624	37.4079	I=18.7, R1=19.4, R2=19.9	USNO-B1
101.1	67.1025	37.4169		NED
102.7	67.0808	37.4060	B2=21.1, I=18.7, R1=19.3	USNO-B1
103.3	67.1104	37.4361		NED
103.9	67.0808	37.4625		NED
106.9	67.0413	37.4203		NED
108.0	67.0508	37.4108		NED
108.8	67.0858	37.4628		NED
109.9	67.1096	37.4464		NED
112.4	67.0629	37.4042		NED
112.6	67.0387	37.4469		NED
113.0	67.1078	37.4511	B1=20.6, R2=19.2	USNO-B1
113.1	67.0354	37.4392		NED
114.1	67.1079	37.4514		NED
114.9	67.1146	37.4358		NED
115.1	67.0342	37.4325		NED
115.3	67.0342	37.4325		NED
115.3	67.0343	37.4326	B1=20.2, B2=19.2, I=15.7, R1=16.7, R2=16.9	USNO-B1
115.6	67.1108	37.4200		NED
115.8	67.0346	37.4283		NED
116.5	67.0905	37.4639	I=18.3, R1=18.9, R2=18.9	USNO-B1
116.7	67.0459	37.4111	I=18.9, R2=19.9	USNO-B1
116.8	67.1013	37.4586		NED
118.2	67.1096	37.4166	B2=20.8, I=18.4, R1=19.6, R2=19.1	USNO-B1
118.3	67.0913	37.4642		NED
118.3	67.0983	37.4072		NED
118.6	67.1033	37.4106		NED
119.0	67.1154	37.4406		NED
119.2	67.1100	37.4164		NED
119.6	67.1105	37.4170	B2=21.1, I=18.7, R2=19.5	USNO-B1
121.4	67.0550	37.4639		NED
121.8	67.1004	37.4072		NED
122.2	67.0712	37.4003		NED
123.5	67.0496	37.4622		NED
123.7	67.0833	37.4678		NED
123.7	67.0996	37.4061		NED
124.9	67.1092	37.4553		NED
125.3	67.1008	37.4061		NED
125.6	67.0392	37.4547		NED
127.0	67.0637	37.4000		NED
130.5	67.1150	37.4506		NED
132.5	67.1004	37.4647		NED
135.1	67.0746	37.3967		NED
135.2	67.0875	37.4703		NED
137.1	67.0800	37.4719		NED
139.5	67.1150	37.4558		NED
139.9	67.1077	37.4055	R1=19.5, R2=20.0	USNO-B1
140.3	67.0900	37.3972		NED
140.8	67.0275	37.4456		NED
141.0	67.1117	37.4600		NED
141.0	67.1233	37.4289		NED
141.1	67.0421	37.4046	B2=20.9, I=18.0, R2=19.4	USNO-B1
141.1	67.0250	37.4347		NED
141.9	67.0527	37.3987	I=18.9, R2=20.1	USNO-B1
142.0	67.0517	37.3992		NED
142.1	67.1083	37.4053		NED
142.7	67.1217	37.4208		NED
143.5	67.1033	37.4669		NED
144.7	67.0906	37.3960	B1=20.6, I=18.8, R2=20.0	USNO-B1
145.3	67.0708	37.4744		NED
145.4	67.1121	37.4069		NED
146.0	67.0561	37.4719	I=18.7, R2=20.1	USNO-B1
147.5	67.0625	37.3942		NED
148.1	67.0512	37.4708		NED
148.2	67.0858	37.3939		NED
149.1	67.0350	37.4072		NED
149.1	67.0350	37.4071	B1=19.2, B2=18.1, I=15.3, R1=16.5, R2=16.3	USNO-B1
150.5	67.1083	37.4661		NED
151.1	67.0771	37.3922		NED
151.2	67.0812	37.3924	B1=20.4, I=18.8	USNO-B1
151.3	67.0946	37.4731		NED
152.6	67.1279	37.4344		NED
152.9	67.0454	37.3986		NED
153.3	67.1042	37.3986		NED
153.7	67.0217	37.4414		NED
154.4	67.0387	37.4664		NED
154.8	67.1172	37.4076	I=18.7, R2=20.0	USNO-B1
154.9	67.1192	37.4097		NED
155.2	67.0325	37.4069	B2=20.5, I=17.3, R1=18.9, R2=18.3	USNO-B1
155.4	67.0403	37.4676	I=18.7, R2=19.4	USNO-B1
155.6	67.1175	37.4075		NED
155.6	67.1094	37.4008	B2=20.7, I=18.1, R1=19.2, R2=19.1	USNO-B1
155.9	67.1092	37.4008		NED
156.5	67.0246	37.4164		NED
156.9	67.0588	37.3925		NED
156.9	67.1133	37.4033		NED
157.1	67.1229	37.4547		NED
157.1	67.0317	37.4068	B2=20.6, I=17.5, R2=17.6	USNO-B1
157.5	67.0195	37.4335	I=18.5, R2=19.8	USNO-B1
157.9	67.1196	37.4594		NED
157.9	67.1195	37.4596	B2=20.3, I=17.2, R1=18.2, R2=18.1	USNO-B1
158.9	67.1271	37.4203		NED
159.9	67.0531	37.3931	B2=21.3, I=18.9, R2=19.8	USNO-B1
160.3	67.1025	37.4725		NED
162.2	67.1083	37.3978		NED
162.5	67.0446	37.4725		NED
162.8	67.0250	37.4567		NED
163.4	67.0962	37.3919		NED
163.9	67.0715	37.4796	I=18.9, R2=18.5	USNO-B1
164.1	67.0445	37.4729	I=18.6, R2=20.0	USNO-B1
164.4	67.0196	37.4478		NED
164.7	67.0197	37.4479	B1=20.5, B2=20.4, I=17.2, R1=18.6, R2=18.6	USNO-B1
165.0	67.1067	37.3960	B2=21.5, I=18.4, R2=19.7	USNO-B1
165.3	67.0442	37.4731	B2=21.4, I=18.7, R2=19.6	USNO-B1
165.4	67.1067	37.3958		NED
165.8	67.0243	37.4571	I=18.3, R2=20.1	USNO-B1
166.4	67.1138	37.4683		NED
166.9	67.0296	37.4639		NED
167.8	67.0992	37.4764		NED
168.3	67.0554	37.3900		NED
168.3	67.1262	37.4117		NED
168.8	67.1292	37.4522		NED
169.1	67.1338	37.4361		NED
169.6	67.0192	37.4511		NED
169.7	67.0193	37.4512	I=18.3, R1=19.4, R2=19.8	USNO-B1
170.2	67.0688	37.3869		NED
170.6	67.0483	37.4767		NED
171.0	67.1219	37.4632	B1=20.4, I=19.0, R2=19.8	USNO-B1
171.7	67.0417	37.3942		NED
171.8	67.0967	37.4786		NED
172.0	67.0567	37.4797		NED
172.4	67.0142	37.4361		NED
172.7	67.0142	37.4383		NED
173.0	67.0192	37.4536		NED
173.5	67.0529	37.3892		NED
173.5	67.1213	37.4033		NED
173.8	67.0913	37.4806		NED
173.8	67.0191	37.4539	I=18.5, R2=19.5	USNO-B1
174.2	67.0863	37.4817		NED
174.7	67.0271	37.4033		NED
175.7	67.1325	37.4181		NED
176.7	67.1194	37.4680	I=19.0, R2=20.0	USNO-B1
177.2	67.0375	37.4736		NED
177.7	67.0375	37.4736		NED
177.8	67.1324	37.4524	B1=20.6, B2=21.0, I=17.7, R1=18.9, R2=19.1	USNO-B1
177.8	67.1321	37.4525		NED
178.5	67.0161	37.4514	I=18.8, R2=20.1	USNO-B1
179.9	67.1129	37.4736		NED
180.2	67.1317	37.4128		NED
180.9	67.1275	37.4064		NED
181.4	67.1349	37.4499	I=16.6, R2=18.0	USNO-B1
181.7	67.0133	37.4475		NED
182.0	67.1308	37.4108		NED
182.5	67.0483	37.3881		NED
182.7	67.0238	37.4033		NED
182.9	67.0237	37.4033	B1=20.6, B2=20.0, I=16.9, R1=18.4, R2=18.1	USNO-B1
183.7	67.0121	37.4225		NED
183.9	67.0215	37.4052	B1=20.2, I=18.6	USNO-B1
184.3	67.0100	37.4311		NED
184.3	67.1392	37.4361		NED
184.4	67.0104	37.4297		NED
184.6	67.0996	37.3869		NED
184.7	67.1021	37.3878		NED
184.9	67.1294	37.4069	I=18.6, R2=19.6	USNO-B1
184.9	67.1375	37.4225		NED
185.3	67.0825	37.4853		NED
185.3	67.0867	37.4847		NED
185.9	67.0133	37.4169		NED
185.9	67.0258	37.4683		NED
186.3	67.0254	37.4681		NED
186.3	67.0199	37.4060	B1=20.6, I=18.3	USNO-B1
186.4	67.0254	37.4681	B2=20.5, I=17.6, R1=18.7, R2=18.3	USNO-B1
186.5	67.0547	37.3848	I=18.4, R2=19.9	USNO-B1
186.5	67.0546	37.3847		NED
187.2	67.0212	37.4042		NED
187.3	67.1192	37.3958		NED
187.6	67.0533	37.4833		NED
188.0	67.0617	37.3828		NED
188.4	67.0373	37.3910	I=18.9, R2=20.1	USNO-B1
188.5	67.1367	37.4169		NED
188.8	67.0929	37.4845	B1=20.4, I=18.2, R2=19.7	USNO-B1
189.1	67.0100	37.4231		NED
190.0	67.0092	37.4433		NED
190.3	67.0387	37.4786		NED
190.6	67.1412	37.4339		NED
191.4	67.1386	37.4498	B1=14.3, B2=13.6, I=10.1, R1=11.0, R2=11.0	USNO-B1
191.5	67.1388	37.4497		NED
191.8	67.0925	37.4856		NED
192.2	67.1150	37.4769		NED
192.5	67.0115	37.4154	B1=20.6, I=17.9, R2=19.6	USNO-B1
192.8	67.0171	37.4061	I=17.4, R2=18.6	USNO-B1
193.3	67.0100	37.4503		NED
193.4	67.1388	37.4514		NED
194.1	67.0260	37.3964	B2=21.2, I=18.7, R2=19.9	USNO-B1
194.4	67.0163	37.4063	I=17.8, R2=19.4	USNO-B1
194.9	67.1375	37.4133		NED
195.5	67.0500	37.4847		NED
197.3	67.1171	37.4772		NED
197.5	67.1392	37.4536	B1=20.4, I=18.3, R2=18.9	USNO-B1
198.4	67.1350	37.4611		NED
198.6	67.1179	37.3908		NED
198.8	67.0658	37.3794		NED
199.0	67.1440	37.4302	B1=18.4, B2=17.7, I=15.4, R1=16.3, R2=16.2	USNO-B1
199.1	67.1442	37.4303		NED
199.1	67.0183	37.4014		NED
199.8	67.1438	37.4408		NED
199.9	67.0693	37.3787	I=18.0, R1=19.5, R2=19.5	USNO-B1

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