Swift Trigger: 1033328;

Presumed name: GRB 210218A

BAT	03^h 09^m 09.84^s, +35° 17′ 13.2″
position:	(47.291, +35.287 ± 180″)
XRT	No position available.
UVOT	No position available.
Galactic N_HI:	1.13×10⁰ cm^-2
Galactic E(B-V):	0.204 mag

Best RA:	03^h 09^m 09.84^s	= 47.291 d
Best Dec:	+35° 17′ 13.2″	= +35.287 d

Gal Lat:	-19.62
Gal Long:	152.27

Sun angle:	85.03°, -5.0 hr East of Sun

Galaxies within 3.33 of BAT position

	RA*	Dec*		Catalogue
4.3	47.2896	35.2872		NED
12.5	47.2936	35.2843	B=21.7, R=19.6	APM-N
13.4	47.2933	35.2839		NED
20.0	47.2862	35.2911		NED
21.5	47.2837	35.2856		NED
22.4	47.2975	35.2903		NED
22.8	47.2975	35.2903		NED
32.3	47.2976	35.2798	B1=19.7, B2=19.8, I=18.1, R1=18.4, R2=18.6	USNO-B1
32.3	47.2975	35.2797		NED
33.7	47.2917	35.2778		NED
36.5	47.2788	35.2881		NED
37.1	47.2821	35.2797		NED
40.3	47.2817	35.2953		NED
47.6	47.2746	35.2864		NED
47.8	47.3054	35.2811		NED
52.1	47.2744	35.2921	B1=19.4, B2=19.8, R1=19.1, R2=19.4	USNO-B1
52.3	47.2733	35.2892		NED
53.8	47.2750	35.2794		NED
54.3	47.2967	35.3014		NED
54.6	47.2871	35.2722		NED
55.7	47.3092	35.2833		NED
55.8	47.2929	35.3025		NED
56.1	47.3100	35.2889	B1=20.6, B2=20.6, R2=20.1	USNO-B1
56.2	47.2987	35.2728		NED
57.6	47.3046	35.2986	B2=20.6, R1=19.3, R2=20.0	USNO-B1
57.9	47.3044	35.2988	B=22.1, R=19.6	APM-N
59.2	47.3071	35.2967		NED
60.5	47.2950	35.2706		NED
67.8	47.2696	35.2800		NED
70.0	47.3146	35.2858		NED
73.7	47.3154	35.2914		NED
74.9	47.2742	35.2714		NED
75.8	47.3167	35.2878		NED
76.0	47.2754	35.2703		NED
78.2	47.3083	35.2706		NED
78.7	47.3129	35.2996	B=21.8, R=18.7	APM-N
79.4	47.3129	35.2997		NED
81.3	47.3171	35.2944		NED
82.0	47.2637	35.2919		NED
83.9	47.2829	35.3094		NED
84.7	47.3196	35.2856		NED
84.8	47.2955	35.2637	B1=14.2, B2=14.3, I=11.3, R1=12.5, R2=12.7	USNO-B1
85.1	47.2954	35.2636		NED
89.6	47.3117	35.3052	B2=20.7, R1=19.5, R2=19.4	USNO-B1
90.0	47.3117	35.3053		NED
94.9	47.2654	35.3033		NED
95.1	47.3208	35.2972		NED
97.0	47.3225	35.2792		NED
98.2	47.2821	35.2608		NED
98.3	47.2983	35.3136		NED
99.2	47.2578	35.2918	B=20.1, R=18.7	APM-N
99.7	47.2575	35.2919		NED
101.3	47.2817	35.3142		NED
101.6	47.2737	35.2625		NED
102.0	47.3100	35.3108		NED
102.0	47.3058	35.3128		NED
102.3	47.3181	35.3048	B=22.1, R=19.8	APM-N
102.6	47.3097	35.3111	B=22.1, R=19.6	APM-N
102.7	47.3183	35.3050		NED
105.8	47.3258	35.2936		NED
106.9	47.3229	35.3008		NED
107.3	47.2867	35.2575		NED
107.9	47.3275	35.2844		NED
108.7	47.2542	35.2839		NED
109.9	47.2746	35.2594		NED
111.0	47.2963	35.2564		NED
112.3	47.2646	35.3097		NED
113.9	47.2683	35.3128		NED
114.5	47.3021	35.3175		NED
115.0	47.2546	35.2989		NED
115.8	47.2917	35.2547		NED
117.0	47.3008	35.2556		NED
117.1	47.3254	35.2708		NED
118.1	47.3117	35.3150		NED
120.2	47.2737	35.2567		NED
124.3	47.2529	35.2717		NED
125.2	47.2608	35.2622		NED
125.7	47.3304	35.3006		NED
126.0	47.2481	35.2874	B1=15.7, B2=16.3, I=14.0, R1=14.9, R2=14.9	USNO-B1
126.4	47.2479	35.2875		NED
128.2	47.3346	35.2883		NED
128.4	47.3269	35.2667	B=20.7, R=19.3	APM-N
128.5	47.3267	35.2667		NED
128.6	47.3347	35.2886	B=22.1, R=19.4	APM-N
131.6	47.2633	35.3158		NED
132.1	47.2746	35.2528		NED
132.5	47.2744	35.2528	B1=20.7, B2=20.7, R1=19.5, R2=19.3	USNO-B1
132.7	47.2512	35.2694		NED
133.3	47.3338	35.2992		NED
133.5	47.3254	35.2628		NED
134.1	47.3358	35.2814		NED
135.4	47.2512	35.3061		NED
136.1	47.3325	35.3033		NED
136.7	47.3349	35.2997	B1=18.9, B2=18.9, R1=18.3	USNO-B1
137.1	47.2642	35.2558		NED
137.2	47.2446	35.2903		NED
137.6	47.2533	35.2642		NED
137.7	47.2654	35.3189		NED
139.4	47.2692	35.3214		NED
140.6	47.3054	35.2497	B=17.5, R=15.4	APM-N
141.5	47.2729	35.3233		NED
141.6	47.2575	35.3153		NED
142.3	47.3050	35.2492		NED
142.7	47.3050	35.2492		NED
143.3	47.2421	35.2881		NED
144.3	47.3033	35.2483		NED
144.8	47.3292	35.3125		NED
146.0	47.2800	35.3267		NED
146.7	47.2417	35.2933		NED
147.0	47.2499	35.2637	B1=20.6, B2=20.6	USNO-B1
149.5	47.2404	35.2906		NED
149.6	47.2483	35.2642		NED
150.6	47.2526	35.2593	B=21.0, R=19.4	APM-N
151.3	47.3317	35.2614		NED
152.3	47.2637	35.2511		NED
152.5	47.3371	35.3061		NED
153.6	47.2667	35.3250		NED
155.5	47.3438	35.2886		NED
155.7	47.3354	35.2634	B=20.6, R=19.4	APM-N
155.8	47.3354	35.2633		NED
155.8	47.2712	35.3272		NED
156.0	47.3354	35.2633	B1=19.6, B2=19.9, R1=19.5, R2=19.6	USNO-B1
157.4	47.3442	35.2833		NED
158.2	47.2371	35.2872		NED
158.3	47.3449	35.2882	B=22.1, R=18.2	APM-N
158.4	47.2963	35.2431		NED
158.6	47.2370	35.2874	B=19.4, R=18.4	APM-N
158.6	47.2471	35.2614		NED
160.1	47.2746	35.3294		NED
160.6	47.2394	35.3018	B=21.8, R=18.4	APM-N
161.4	47.2387	35.3014		NED
161.8	47.2387	35.3014		NED
162.7	47.3438	35.2736		NED
162.9	47.2579	35.2508		NED
165.3	47.3046	35.3317		NED
165.9	47.3012	35.2417	B=22.1, R=19.3	APM-N
166.9	47.3008	35.2414		NED
166.9	47.2683	35.3294		NED
167.1	47.2612	35.3264		NED
167.9	47.2946	35.2406		NED
168.3	47.2539	35.3227	B=22.0, R=20.0	APM-N
169.6	47.3471	35.2972		NED
169.6	47.3250	35.3250		NED
170.6	47.2379	35.3064		NED
171.7	47.3258	35.2489		NED
172.8	47.2321	35.2906		NED
173.1	47.3333	35.2536		NED
173.9	47.2324	35.2803	B1=20.8, B2=20.7, R1=19.7	USNO-B1
174.1	47.2358	35.3050		NED
174.1	47.2992	35.3350		NED
175.1	47.3167	35.2431		NED
175.3	47.2912	35.3356		NED
175.3	47.2929	35.2383		NED
175.4	47.2382	35.2642	B=22.0, R=18.1	APM-N
175.6	47.2383	35.2639		NED
176.6	47.3425	35.2619		NED
177.5	47.3361	35.3198	R1=19.6, R2=19.9	USNO-B1
177.7	47.3192	35.3306		NED
177.8	47.3362	35.3197		NED
179.0	47.3508	35.2956		NED
179.4	47.3433	35.3122		NED
179.8	47.3050	35.2383		NED
181.0	47.3203	35.2428	B=21.6, R=19.4	APM-N
181.2	47.3504	35.3000		NED
182.1	47.3383	35.3194		NED
182.3	47.3204	35.2425		NED
183.2	47.3417	35.3167		NED
183.3	47.3237	35.3303		NED
183.3	47.3237	35.3304	B1=20.1, B2=20.6, I=18.2, R1=18.9, R2=18.5	USNO-B1
183.4	47.3475	35.3083		NED
184.0	47.2742	35.2378		NED
184.6	47.2646	35.2406		NED
185.1	47.3409	35.2556	B=21.4, R=19.6	APM-N
186.1	47.2283	35.2797		NED
186.5	47.2804	35.3381	B1=20.7, B2=20.7, R2=19.8	USNO-B1
186.9	47.2837	35.3386		NED
187.4	47.2287	35.2753		NED
190.1	47.2650	35.3353		NED
190.1	47.2500	35.3278		NED
191.3	47.2433	35.2506		NED
191.7	47.3292	35.3300		NED
191.9	47.2367	35.3167		NED
192.2	47.2333	35.3122		NED
192.5	47.3017	35.2342		NED
193.2	47.3018	35.2341	B=19.0, R=18.1	APM-N
193.2	47.2533	35.3310	B=21.6, R=20.0	APM-N
193.9	47.3019	35.2339	B1=18.7, B2=19.3, I=18.4, R1=18.6, R2=18.3	USNO-B1
194.2	47.2583	35.2400		NED
194.6	47.2287	35.3056		NED
194.7	47.2329	35.2608		NED
197.4	47.2712	35.2344		NED
197.5	47.3579	35.2911		NED
198.2	47.3342	35.2450		NED
198.4	47.3475	35.3172		NED
198.4	47.2400	35.3231		NED
198.6	47.2387	35.2519		NED
198.7	47.3526	35.2642	B=22.1, R=19.2	APM-N
198.9	47.3525	35.2640	R1=19.7, R2=19.0	USNO-B1
199.1	47.2504	35.3314		NED
199.4	47.3525	35.2639		NED
200.0	47.3279	35.2403		NED
200.0	47.2275	35.2664		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