Swift Trigger: 1015873;

Presumed name: GRB 210104A

BAT	06^h 54^m 49.20^s, +64° 39′ 39.6″
position:	(103.705, +64.661 ± 180″)
XRT	06^h 55^m 04.97^s, +64° 40′ 27.5″
position:	(103.7707, 64.6743 ± 5.3″)
UVOT	No position available.
Galactic N_HI:	4.37×10⁰ cm^-2
Galactic E(B-V):	0.047 mag

Best RA:	06^h 55^m 04.97^s	= 103.7707 d
Best Dec:	+64° 40′ 27.5″	= 64.6743 d

Gal Lat:	24.72
Gal Long:	151.02

Sun angle:	138.02°, -11.9 hr East of Sun

¹Sper #0 auto processing.

Galaxies within 3.33 of XRT position

	RA*	Dec*		Catalogue
16.0	103.7792	64.6718	B2=20.9, I=18.4, R1=19.6	USNO-B1
16.3	103.7758	64.6703		NED
16.3	103.7793	64.6717	B=21.9, R=18.9	APM-N
16.4	103.7792	64.6717		NED
16.8	103.7625	64.6711		NED
17.7	103.7592	64.6742		NED
23.2	103.7846	64.6767		NED
23.5	103.7558	64.6756		NED
29.5	103.7812	64.6811		NED
34.6	103.7663	64.6650		NED
36.6	103.7583	64.6831		NED
39.3	103.7483	64.6689		NED
39.3	103.7566	64.6834	B2=19.0, R1=20.1	USNO-B1
50.9	103.7427	64.6668	B1=21.1, B2=20.9	USNO-B1
51.2	103.7981	64.6824	B2=22.0, R1=20.6	USNO-B1
55.1	103.7600	64.6889		NED
56.5	103.7721	64.6900		NED
57.5	103.7642	64.6586		NED
57.9	103.7715	64.6904	B1=20.4, B2=20.9, R1=20.5	USNO-B1
58.1	103.7333	64.6764		NED
58.3	103.7988	64.6853		NED
58.4	103.7331	64.6765	B=21.0, R=18.8	APM-N
59.3	103.7710	64.6908	B=20.5, R=19.9	APM-N
60.7	103.8096	64.6764		NED
63.8	103.7808	64.6572		NED
64.3	103.7517	64.6903		NED
65.8	103.7992	64.6608		NED
66.8	103.8083	64.6653		NED
67.9	103.7796	64.6928		NED
68.4	103.7794	64.6929	B=21.5, R=18.5	APM-N
71.0	103.7929	64.6917		NED
71.2	103.7933	64.6569		NED
71.5	103.7304	64.6842		NED
76.6	103.8146	64.6842		NED
77.7	103.7562	64.6536		NED
80.9	103.7858	64.6958		NED
81.8	103.7246	64.6856		NED
84.0	103.7408	64.6939		NED
85.8	103.7344	64.6562	B1=20.9, B2=20.8, I=18.5, R1=19.8, R2=19.1	USNO-B1
86.8	103.7658	64.6503		NED
86.8	103.7300	64.6575		NED
87.0	103.8025	64.6544		NED
87.9	103.8224	64.6639	B1=21.0, R1=20.6, R2=19.8	USNO-B1
88.1	103.8225	64.6639		NED
88.8	103.8208	64.6867		NED
90.3	103.8292	64.6744		NED
91.1	103.7121	64.6778		NED
91.4	103.7596	64.6992		NED
93.4	103.7509	64.6988	B2=20.9, R1=20.6	USNO-B1
93.9	103.7100	64.6711		NED
94.5	103.8137	64.6931		NED
94.9	103.7246	64.6917		NED
95.5	103.7967	64.6983		NED
95.9	103.7413	64.6508		NED
96.4	103.8279	64.6853		NED
96.5	103.7850	64.7003		NED
97.4	103.8337	64.6722		NED
97.6	103.8204	64.6575		NED
97.9	103.8337	64.6775		NED
98.2	103.8329	64.6683		NED
98.8	103.8288	64.6861		NED
100.1	103.7371	64.6981		NED
101.0	103.7369	64.6984	B2=20.6, R1=20.4, R2=20.0	USNO-B1
101.5	103.7562	64.7019		NED
101.7	103.8298	64.6869	B=15.8, R=14.7	APM-N
103.6	103.8304	64.6875		NED
103.7	103.7917	64.6469		NED
104.2	103.8350	64.6656		NED
106.5	103.7225	64.6531	B1=20.3, I=18.8	USNO-B1
107.2	103.7225	64.6528		NED
107.9	103.8163	64.6969		NED
108.4	103.7063	64.6622		NED
108.9	103.8361	64.6628	B1=21.1, R2=21.0	USNO-B1
110.5	103.8042	64.7014		NED
110.7	103.7192	64.6958		NED
112.3	103.8229	64.6525		NED
114.3	103.6983	64.6669		NED
115.0	103.8417	64.6842		NED
116.5	103.6950	64.6725		NED
118.9	103.8033	64.6444		NED
119.0	103.7392	64.6442		NED
119.5	103.7887	64.6419		NED
119.9	103.8212	64.6489		NED
123.1	103.7138	64.6983	B1=20.4, B2=20.9, R1=20.3	USNO-B1
128.2	103.7096	64.6500		NED
130.7	103.8129	64.7058		NED
131.1	103.8128	64.7060	B2=20.6, I=18.1, R1=20.1, R2=19.5	USNO-B1
131.3	103.8554	64.6703		NED
131.7	103.6888	64.6639		NED
132.8	103.8292	64.6472		NED
133.5	103.8571	64.6753		NED
133.6	103.8574	64.6752	B=20.9, R=17.7	APM-N
134.4	103.7696	64.7117		NED
135.4	103.8525	64.6606		NED
135.8	103.7838	64.6369		NED
136.4	103.8429	64.6525		NED
136.4	103.7841	64.6368	B1=20.7, I=18.7	USNO-B1
136.4	103.8567	64.6656		NED
136.5	103.8433	64.6526	B=18.0, R=17.1	APM-N
137.0	103.6821	64.6769		NED
137.6	103.7358	64.7094		NED
138.2	103.8375	64.6486		NED
138.7	103.7208	64.7064		NED
138.7	103.7625	64.6358		NED
140.3	103.7158	64.6431		NED
140.5	103.8467	64.6961		NED
140.8	103.6817	64.6653		NED
141.1	103.6817	64.6650	B=22.0, R=19.6	APM-N
141.5	103.8120	64.6392	B1=18.8, B2=19.0, I=17.9, R1=18.8, R2=18.2	USNO-B1
141.6	103.8342	64.7028		NED
141.7	103.8271	64.7056		NED
141.7	103.8120	64.6391	B=18.8, R=17.8	APM-N
142.0	103.8117	64.6389		NED
142.3	103.7975	64.7122		NED
142.8	103.8633	64.6725		NED
142.9	103.8221	64.7072		NED
143.9	103.6792	64.6822		NED
143.9	103.6791	64.6823	B=20.3, R=17.2	APM-N
144.1	103.8408	64.7008		NED
144.4	103.6778	64.6688	I=18.6, R1=20.1, R2=19.2	USNO-B1
144.5	103.6779	64.6683		NED
144.7	103.7146	64.7064		NED
145.1	103.6774	64.6686	B=22.0, R=19.0	APM-N
145.5	103.8414	64.7011	B=21.4, R=19.3	APM-N
145.8	103.8446	64.6489		NED
146.6	103.7538	64.7144		NED
147.3	103.8662	64.6767		NED
147.5	103.8083	64.7119		NED
147.5	103.7858	64.7147		NED
147.7	103.6796	64.6869		NED
147.8	103.7746	64.7153		NED
148.5	103.8500	64.6511		NED
148.7	103.7900	64.6339		NED
148.9	103.7233	64.7103		NED
150.5	103.8579	64.6931		NED
150.5	103.6892	64.6972		NED
153.3	103.7718	64.7169	B1=21.1, I=18.8, R1=20.4	USNO-B1
153.5	103.8225	64.6378		NED
153.6	103.7008	64.7047		NED
154.1	103.6958	64.6458		NED
155.6	103.8467	64.6458		NED
156.1	103.6783	64.6921	B2=19.2, I=18.4, R2=19.1	USNO-B1
156.4	103.6780	64.6921	B=19.4, R=18.7	APM-N
156.4	103.8275	64.7103		NED
156.9	103.6779	64.6922		NED
157.0	103.6700	64.6675		NED
157.3	103.6700	64.6822		NED
157.6	103.8313	64.6392		NED
158.0	103.7721	64.7181		NED
159.2	103.8508	64.7022		NED
159.2	103.8508	64.7023	B=16.7, R=15.9	APM-N
160.5	103.6750	64.6564		NED
160.6	103.7296	64.6333		NED
161.5	103.8421	64.7072		NED
161.5	103.8667	64.6922		NED
161.8	103.8600	64.6978		NED
162.2	103.8669	64.6927	B1=21.1, B2=20.9, I=18.7, R1=20.1, R2=19.5	USNO-B1
162.2	103.6654	64.6728		NED
162.6	103.8671	64.6925		NED
163.1	103.6770	64.6955	B2=20.9, R1=20.1	USNO-B1
164.8	103.6717	64.6917		NED
164.9	103.6929	64.7058		NED
165.6	103.8313	64.6364		NED
165.7	103.7979	64.6297		NED
165.8	103.6696	64.6583		NED
165.9	103.7776	64.7203	B=18.4, R=17.3	APM-N
166.0	103.6696	64.6584	B=20.1, R=18.0	APM-N
166.2	103.7775	64.7204	B1=18.0, B2=18.6, I=17.3, R1=17.6, R2=17.6	USNO-B1
167.1	103.7179	64.6336		NED
167.3	103.7783	64.7206		NED
167.4	103.8718	64.6573	B=21.9, R=20.0	APM-N
167.6	103.6763	64.6511		NED
167.9	103.7521	64.6283		NED
168.3	103.7976	64.6290	B1=20.6, B2=15.7, R1=18.1, R2=17.5	USNO-B1
169.4	103.7267	64.6311		NED
170.1	103.6988	64.6383		NED
170.1	103.8448	64.6393	B1=17.2, B2=18.0, I=15.4, R1=15.8, R2=16.0	USNO-B1
170.3	103.8446	64.6392		NED
170.3	103.7125	64.7144		NED
171.3	103.7979	64.6281		NED
171.6	103.7321	64.7192		NED
173.2	103.6825	64.6444		NED
173.2	103.8575	64.6439		NED
173.5	103.8302	64.7152	R1=18.5, R2=18.6	USNO-B1
174.0	103.7082	64.6340	I=18.4, R1=20.1, R2=19.7	USNO-B1
174.1	103.7083	64.6339		NED
174.5	103.8796	64.6881		NED
175.0	103.6571	64.6758		NED
175.6	103.6567	64.6759	B=22.0, R=19.4	APM-N
176.9	103.6888	64.7089		NED
176.9	103.8394	64.7137	B2=20.8, I=18.6, R2=19.8	USNO-B1
177.2	103.6600	64.6608		NED
177.7	103.6598	64.6608	I=18.4, R1=20.1, R2=20.0	USNO-B1
179.2	103.6854	64.6403		NED
181.8	103.7717	64.7247		NED
181.9	103.6942	64.7128		NED
182.1	103.8300	64.7181		NED
183.1	103.7625	64.7250		NED
183.2	103.6567	64.6597		NED
183.5	103.6564	64.6599	B1=20.9, I=18.6	USNO-B1
184.6	103.6704	64.7022		NED
184.9	103.6706	64.7027	B2=20.9, I=18.6, R1=20.0, R2=19.5	USNO-B1
185.0	103.7071	64.7178		NED
185.7	103.6621	64.6969		NED
185.8	103.7881	64.7254	B1=16.6, B2=16.6, I=15.2, R1=15.5, R2=15.7	USNO-B1
186.1	103.7883	64.7256		NED
187.9	103.8507	64.7137	B2=22.1, I=18.7	USNO-B1
188.1	103.8413	64.6317		NED
188.2	103.8704	64.7047		NED
188.3	103.6958	64.6331		NED
188.3	103.8769	64.6484	I=18.5, R1=20.7, R2=19.8	USNO-B1
188.4	103.8767	64.6483		NED
189.4	103.8517	64.7139		NED
189.7	103.8775	64.7006		NED
190.1	103.7429	64.6228		NED
190.4	103.8943	64.6753	B=21.3, R=19.7	APM-N
190.6	103.8942	64.6753		NED
190.9	103.7013	64.7183		NED
191.7	103.8039	64.6230	B2=20.4, I=17.1	USNO-B1
191.8	103.8936	64.6656	B2=20.9, R2=19.7	USNO-B1
191.9	103.8404	64.7183		NED
192.0	103.8858	64.6950		NED
192.1	103.8929	64.6639		NED
192.3	103.8408	64.7186		NED
192.5	103.8235	64.7228	B=22.0, R=19.9	APM-N
192.6	103.8030	64.6226	I=17.4, R1=16.8	USNO-B1
194.3	103.6533	64.6942		NED
195.8	103.7767	64.7286		NED
196.0	103.7225	64.6239		NED
196.3	103.8954	64.6856		NED
196.3	103.7771	64.7288	I=18.4, R1=19.6, R2=20.1	USNO-B1
196.3	103.7903	64.6204	R1=18.9, R2=18.3	USNO-B1
197.0	103.8939	64.6891	B=22.0, R=19.9	APM-N
197.3	103.8796	64.6456		NED
197.4	103.8942	64.6889		NED
197.4	103.7912	64.6202	B2=20.2, R1=19.3	USNO-B1
198.3	103.6575	64.6481		NED
199.2	103.6425	64.6822		NED
199.3	103.8972	64.6861	B1=20.9, B2=20.3, R2=19.9	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