Swift Trigger: 510649;

Presumed name: GRB 111228A

BAT	10^h 00^m 18.96^s, +18° 17′ 34.8″
position:	(150.079, +18.293 ± 180″)
XRT	10^h 00^m 16.15^s, +18° 17′ 51.7″
position:	(150.0673, 18.2977 ± 2.0″)
UVOT	10^h 00^m 15.98^s, +18° 17′ 51.7″
position:	(150.0666, +18.2977 ± 0.8″)
Galactic N_HI:	2.95×10²⁰ cm^-2
Galactic E(B-V):	0.032 mag

Best RA:	10^h 00^m 15.98^s	= 150.0666 d
Best Dec:	+18° 17′ 51.7″	= +18.2977 d

Gal Lat:	49.75
Gal Long:	216.33

Sun angle:	130.34°, 8.5 hr West

¹Sper #4 auto processing.

Stars within 3.33 of XRT position

	RA*	Dec*		Catalogue
11.6	150.0685	18.2947	I=19.2, R1=19.7	USNO-B1
21.1	150.0730	18.3000	I=24.8, R=24.8, g=25.7, u=22.4, z=22.7	SDSS
28.5	150.0624	18.2913	I=24.5, R=24.9, g=25.8, u=22.1, z=22.9	SDSS
29.4	150.0675	18.3059	I=18.7, R1=19.4, R2=19.7	USNO-B1
34.6	150.0745	18.3045	I=19.8, R=20.2, g=20.9, u=23.2, z=19.6	SDSS
35.1	150.0745	18.3047	B1=20.9, B2=20.8, R1=19.3, R2=19.7	USNO-B1
38.7	150.0574	18.3029	I=18.0, R=19.0, g=20.5, u=22.7, z=17.4	SDSS
38.7	150.0573	18.3028	h=15.4, j=16.1, k=15.1	2MASS
38.9	150.0574	18.3030	B2=20.6, I=17.5, R1=18.9, R2=18.9	USNO-B1
53.2	150.0815	18.2917	B1=20.8, B2=20.8, R2=19.5	USNO-B1
53.3	150.0815	18.2917	I=20.4, R=20.4, g=20.6, u=21.6, z=20.1	SDSS
60.4	150.0775	18.2840	B1=18.9, B2=17.6, I=15.2, R1=15.9, R2=16.0	USNO-B1
60.5	150.0775	18.2839	h=14.0, j=14.6, k=13.8	2MASS
60.8	150.0775	18.2839	I=16.0, R=16.5, g=17.6, u=19.9, z=15.7	SDSS
61.9	150.0494	18.2949	I=19.5, R=20.5, g=21.8, u=23.1, z=19.0	SDSS
62.2	150.0492	18.2991	B2=21.2, I=18.0, R1=19.5, R2=19.5	USNO-B1
62.3	150.0491	18.2991	h=16.0, j=16.6, k=15.9	2MASS
62.4	150.0491	18.2990	I=18.6, R=20.0, g=21.3, u=23.3, z=17.9	SDSS
63.9	150.0513	18.3069	I=24.1, R=24.9, g=24.5, u=24.4, z=21.1	SDSS
64.8	150.0672	18.3157	I=22.4, R=22.5, g=23.2, u=23.9, z=22.0	SDSS
70.7	150.0505	18.3091	B1=20.9, B2=20.6, I=19.2	USNO-B1
71.1	150.0762	18.3156	I=18.8, R2=20.1	USNO-B1
71.5	150.0881	18.2955	B2=21.0, R1=19.9, R2=20.1	USNO-B1
72.9	150.0498	18.3092	I=21.7, R=21.9, g=22.1, u=23.1, z=21.4	SDSS
76.7	150.0875	18.3070	I=22.1, R=22.1, g=21.9, u=21.8, z=22.3	SDSS
76.7	150.0790	18.3159	I=21.3, R=21.4, g=21.7, u=22.4, z=21.0	SDSS
77.8	150.0621	18.3187	I=21.9, R=22.4, g=22.7, u=23.0, z=21.6	SDSS
80.9	150.0436	18.2976	I=21.3, R=21.6, g=22.5, u=23.0, z=21.0	SDSS
86.0	150.0872	18.2831	h=12.4, j=12.9, k=12.4	2MASS
86.0	150.0873	18.2831	I=14.0, R=14.3, g=14.9, u=16.5, z=13.9	SDSS
86.0	150.0873	18.2832	B1=15.8, B2=15.2, I=13.4, R1=14.2, R2=14.1	USNO-B1
86.7	150.0614	18.2743	I=22.0, R=22.6, g=23.0, u=23.4, z=21.8	SDSS
91.0	150.0610	18.3223	I=22.3, R=23.3, g=23.3, u=23.4, z=22.5	SDSS
91.7	150.0689	18.2723	I=19.7, R=20.6, g=22.1, u=24.3, z=19.2	SDSS
91.7	150.0413	18.2913	I=21.2, R=21.3, g=22.0, u=24.2, z=21.0	SDSS
92.1	150.0404	18.2991	I=21.3, R=21.3, g=21.8, u=22.5, z=21.2	SDSS
93.6	150.0440	18.3114	I=21.9, R=23.0, g=24.1, u=25.7, z=21.4	SDSS
93.8	150.0913	18.3104	I=22.6, R=22.7, g=23.7, u=23.1, z=22.2	SDSS
97.3	150.0804	18.2737	I=22.2, R=23.8, g=25.1, u=23.7, z=21.3	SDSS
98.5	150.0427	18.3119	B1=20.0, B2=18.4, I=17.1, R1=17.9, R2=17.6	USNO-B1
98.8	150.0455	18.2796	I=20.4, R=21.6, g=23.3, u=24.9, z=19.8	SDSS
99.1	150.0424	18.3118	h=16.0, j=17.0, k=15.0	2MASS
101.8	150.0613	18.3254	h=16.2, j=17.0, k=15.7	2MASS
101.9	150.0614	18.3254	I=19.1, R=20.5, g=21.8, u=23.9, z=18.3	SDSS
101.9	150.0614	18.3254	I=19.0, R=20.4, g=21.8, u=24.9, z=18.2	SDSS
106.8	150.0726	18.2685	I=22.4, R=24.0, g=25.5, u=25.4, z=22.4	SDSS
108.3	150.0738	18.3271	I=19.9, R=20.2, g=20.8, u=22.1, z=19.8	SDSS
109.5	150.0532	18.3250	I=22.3, R=23.3, g=24.0, u=23.7, z=22.2	SDSS
110.1	150.0668	18.2671	I=22.0, R=23.7, g=25.5, u=25.4, z=22.6	SDSS
110.1	150.0752	18.3274	I=21.3, R=21.3, g=21.7, u=22.8, z=20.9	SDSS
110.4	150.0982	18.3067	I=24.6, R=22.9, g=25.6, u=23.3, z=22.9	SDSS
110.8	150.0394	18.3135	B1=20.6, B2=19.5, I=17.6, R1=18.4, R2=17.8	USNO-B1
110.9	150.0394	18.3135	h=16.1, j=16.9, k=15.3	2MASS
113.8	150.0952	18.3149	B1=20.9, B2=21.2, I=18.5, R1=19.5, R2=19.1	USNO-B1
113.9	150.1003	18.2936	B2=21.4, R1=19.6	USNO-B1
115.6	150.1009	18.2942	I=20.8, R=21.1, g=21.7, u=23.5, z=21.3	SDSS
116.0	150.0761	18.2666	B1=19.5, B2=18.4, I=15.9, R1=16.9, R2=16.6	USNO-B1
116.2	150.0760	18.2665	h=14.4, j=15.2, k=14.2	2MASS
116.3	150.0761	18.2665	I=16.6, R=17.1, g=18.3, u=20.9, z=16.3	SDSS
116.3	150.0947	18.3169	B1=20.8, R1=19.7	USNO-B1
117.6	150.0789	18.3284	B2=21.6, R2=19.6	USNO-B1
119.9	150.0870	18.2701	I=21.0, R=22.5, g=23.7, u=23.6, z=20.4	SDSS
124.3	150.0420	18.3225	I=22.4, R=23.0, g=22.9, u=24.7, z=21.4	SDSS
124.3	150.0309	18.2973	B2=20.6, R2=19.9	USNO-B1
124.5	150.0309	18.2973	I=20.0, R=20.3, g=20.9, u=22.0, z=19.9	SDSS
124.8	150.0725	18.3320	I=13.5, R=13.7, g=14.4, u=15.7, z=13.4	SDSS
124.9	150.0725	18.3320	I=13.4, R=14.3, g=14.2, u=15.6, z=13.3	SDSS
124.9	150.0724	18.3320	h=11.8, j=12.2, k=11.8	2MASS
125.0	150.0725	18.3321	B1=15.1, B2=14.4, I=12.6, R1=13.5, R2=13.5	USNO-B1
125.3	150.0812	18.2655	I=22.4, R=22.3, g=23.2, u=23.6, z=22.8	SDSS
125.5	150.0961	18.2761	I=21.4, R=23.4, g=24.5, u=24.4, z=20.5	SDSS
126.4	150.0318	18.3075	B1=17.6, B2=16.7, I=14.8, R1=15.8, R2=15.6	USNO-B1
126.5	150.0317	18.3074	I=15.6, R=15.9, g=16.6, u=18.6, z=15.5	SDSS
126.5	150.0317	18.3074	h=14.1, j=14.5, k=14.0	2MASS
127.5	150.0968	18.2761	I=22.6, R=22.4, g=23.2, u=24.2, z=21.5	SDSS
130.5	150.1028	18.2844	I=24.3, R=24.5, g=25.5, u=25.2, z=20.9	SDSS
130.7	150.0946	18.3232	I=17.5, R=17.8, g=18.9, u=21.2, z=17.3	SDSS
130.7	150.0946	18.3231	h=15.5, j=16.1, k=15.5	2MASS
130.8	150.0946	18.3232	B1=20.1, B2=18.9, I=17.0, R1=17.5, R2=17.3	USNO-B1
131.6	150.0598	18.2619	B1=20.5, B2=20.3, I=18.5, R1=19.3, R2=19.8	USNO-B1
131.8	150.0598	18.2618	I=19.5, R=19.7, g=20.0, u=20.9, z=19.4	SDSS
131.9	150.0340	18.3162	I=22.8, R=22.6, g=25.8, u=26.2, z=22.9	SDSS
135.0	150.1041	18.3114	I=22.1, R=22.4, g=23.3, u=24.7, z=21.2	SDSS
135.9	150.0999	18.2761	I=22.2, R=23.2, g=23.9, u=25.4, z=21.5	SDSS
136.4	150.0295	18.2856	I=21.8, R=22.2, g=22.9, u=23.7, z=22.5	SDSS
137.4	150.0700	18.2596	I=25.2, R=24.7, g=25.4, u=25.5, z=20.6	SDSS
137.8	150.0683	18.3360	I=20.0, R=20.2, g=20.5, u=20.8, z=19.8	SDSS
137.9	150.0683	18.3360	B1=20.6, B2=20.1, R2=19.9	USNO-B1
138.2	150.0292	18.2848	B1=20.5, B2=20.1, R2=19.4	USNO-B1
138.3	150.0292	18.2847	I=20.0, R=20.2, g=20.3, u=20.6, z=20.0	SDSS
138.8	150.0666	18.3362	I=22.4, R=25.0, g=25.3, u=24.6, z=22.8	SDSS
139.3	150.0849	18.2628	I=24.1, R=25.1, g=24.7, u=23.7, z=20.8	SDSS
141.6	150.0283	18.3110	I=22.6, R=22.7, g=23.5, u=23.4, z=21.7	SDSS
143.0	150.0270	18.2869	B1=20.9, B2=20.5, I=18.9, R1=19.3, R2=19.5	USNO-B1
143.1	150.0270	18.2870	I=19.4, R=19.6, g=20.2, u=21.3, z=19.2	SDSS
143.8	150.1056	18.2811	B2=20.8, I=18.7, R1=19.4, R2=18.9	USNO-B1
144.3	150.0923	18.2654	B2=20.6, I=18.7	USNO-B1
145.0	150.0923	18.2651	B2=19.8, I=18.7, R1=18.9, R2=18.7	USNO-B1
145.2	150.0602	18.2579	B1=20.9, B2=20.9, R2=19.7	USNO-B1
145.3	150.0601	18.2579	I=20.5, R=20.7, g=21.1, u=21.8, z=20.2	SDSS
147.9	150.0242	18.2941	B1=20.3, B2=19.9, I=18.9, R1=19.4, R2=19.3	USNO-B1
148.1	150.0241	18.2940	I=19.3, R=19.4, g=19.8, u=20.8, z=19.1	SDSS
150.4	150.1098	18.3086	I=22.8, R=22.3, g=22.8, u=24.3, z=21.7	SDSS
151.5	150.0768	18.2566	I=19.6, R=20.9, g=22.3, u=24.2, z=18.9	SDSS
152.9	150.1120	18.2994	I=21.1, R=21.1, g=21.5, u=22.6, z=21.4	SDSS
154.5	150.0614	18.3403	I=21.8, R=23.2, g=25.4, u=25.7, z=21.3	SDSS
155.0	150.0297	18.3218	I=23.3, R=23.4, g=23.1, u=25.4, z=22.2	SDSS
155.5	150.0263	18.2791	I=22.6, R=22.3, g=22.9, u=23.0, z=22.7	SDSS
155.9	150.0541	18.2562	I=24.7, R=24.8, g=25.3, u=24.7, z=20.7	SDSS
156.6	150.1130	18.2951	I=22.1, R=22.9, g=24.1, u=24.0, z=22.0	SDSS
157.1	150.0407	18.2621	I=20.8, R=22.1, g=23.2, u=24.3, z=20.2	SDSS
157.2	150.0218	18.3040	I=22.2, R=22.9, g=24.7, u=26.5, z=21.9	SDSS
157.6	150.1102	18.3137	h=16.0, j=16.5, k=15.1	2MASS
157.9	150.1103	18.3137	B1=20.7, B2=19.6, I=17.6, R1=18.3, R2=17.8	USNO-B1
158.3	150.0357	18.3298	I=22.1, R=22.4, g=23.4, u=24.2, z=21.5	SDSS
159.7	150.0208	18.2934	I=22.8, R=22.7, g=24.3, u=22.9, z=22.2	SDSS
161.3	150.0871	18.3384	I=20.0, R=20.2, g=20.4, u=21.2, z=20.0	SDSS
161.5	150.0871	18.3384	B1=20.6, B2=20.5, R2=20.2	USNO-B1
162.0	150.0545	18.3410	I=18.7, R=18.9, g=19.4, u=20.5, z=18.6	SDSS
162.2	150.0545	18.3411	B1=20.1, B2=19.6, I=18.5, R1=18.9, R2=18.6	USNO-B1
163.2	150.1019	18.2664	I=24.0, R=24.9, g=26.3, u=24.6, z=20.7	SDSS
164.1	150.1063	18.3242	B1=20.7, I=17.7, R1=17.6, R2=19.1	USNO-B1
165.0	150.1150	18.2907	I=21.4, R=22.1, g=24.2, u=23.6, z=21.5	SDSS
165.2	150.0406	18.3360	B1=20.9, B2=20.0, R1=19.6, R2=19.3	USNO-B1
165.3	150.1093	18.2750	I=20.5, R=21.9, g=23.8, u=24.2, z=19.7	SDSS
165.3	150.1090	18.2745	I=21.5, R=22.3, g=23.2, u=24.8, z=21.4	SDSS
166.0	150.0443	18.3383	I=22.3, R=23.2, g=22.9, u=23.7, z=22.7	SDSS
166.9	150.0739	18.2518	I=19.9, R=20.1, g=20.6, u=21.9, z=19.9	SDSS
166.9	150.0739	18.2518	B2=20.7, R1=19.8, R2=19.6	USNO-B1
167.6	150.0813	18.3423	I=21.1, R=21.8, g=22.9, u=24.4, z=20.6	SDSS
167.6	150.0334	18.3314	I=21.5, R=21.8, g=22.8, u=24.3, z=21.3	SDSS
167.6	150.0477	18.2550	I=24.3, R=24.0, g=25.6, u=24.1, z=20.9	SDSS
169.6	150.1049	18.2670	I=24.1, R=25.7, g=25.3, u=24.5, z=20.8	SDSS
169.8	150.0195	18.3106	B1=20.9, B2=21.0, I=14.9	USNO-B1
171.1	150.0176	18.3034	B1=17.1, B2=16.4, I=14.1, R1=15.1, R2=14.8	USNO-B1
171.1	150.0176	18.3034	I=14.9, R=15.2, g=16.1, u=19.1, z=14.7	SDSS
171.2	150.0176	18.3034	h=13.0, j=13.5, k=12.8	2MASS
171.2	150.1163	18.3078	I=22.6, R=22.7, g=23.5, u=23.8, z=21.5	SDSS
173.0	150.0360	18.3355	I=21.2, R=21.4, g=22.0, u=23.1, z=20.9	SDSS
173.4	150.0906	18.2549	B1=20.9, B2=20.6, I=18.8, R1=19.6, R2=19.7	USNO-B1
175.3	150.0909	18.3409	I=23.5, R=24.0, g=23.2, u=23.3, z=22.9	SDSS
176.1	150.1169	18.2845	B2=21.1, R1=19.4, R2=19.5	USNO-B1
177.8	150.0501	18.2511	B2=21.6, I=18.0, R1=19.9, R2=19.7	USNO-B1
177.9	150.0500	18.2511	h=15.9, j=16.6, k=15.7	2MASS
178.4	150.0500	18.2509	I=18.7, R=20.0, g=21.6, u=23.9, z=17.9	SDSS
179.1	150.1177	18.3115	I=19.5, R=20.6, g=22.1, u=24.9, z=18.9	SDSS
179.9	150.1120	18.2713	I=22.1, R=22.3, g=22.8, u=25.4, z=22.7	SDSS
180.6	150.1088	18.3288	I=22.2, R=23.0, g=24.3, u=24.9, z=21.4	SDSS
180.7	150.1046	18.2621	I=20.3, R=21.2, g=22.7, u=25.2, z=19.6	SDSS
181.0	150.0165	18.3119	I=15.4, R=15.7, g=16.4, u=18.3, z=15.3	SDSS
181.1	150.0165	18.3119	I=15.4, R=15.6, g=16.4, u=18.3, z=15.2	SDSS
181.1	150.0165	18.3120	B1=17.4, B2=16.6, I=14.7, R1=15.4, R2=15.3	USNO-B1
181.1	150.0836	18.2498	I=21.1, R=21.3, g=21.8, u=22.7, z=20.7	SDSS
181.2	150.0165	18.3120	h=13.8, j=14.3, k=13.7	2MASS
182.6	150.0826	18.3463	I=22.1, R=22.3, g=23.5, u=24.6, z=21.6	SDSS
184.1	150.0218	18.3250	I=24.5, R=24.9, g=26.1, u=24.8, z=20.8	SDSS
185.0	150.0671	18.3491	I=20.3, R=20.5, g=20.8, u=21.6, z=20.3	SDSS
185.1	150.0671	18.3491	B2=21.3, R2=20.3	USNO-B1
185.5	150.0136	18.3050	I=24.1, R=25.3, g=22.9, u=25.2, z=23.1	SDSS
185.6	150.0575	18.2470	I=21.3, R=23.8, g=24.5, u=24.3, z=20.0	SDSS
185.6	150.1175	18.2780	I=22.4, R=25.5, g=26.1, u=25.2, z=23.0	SDSS
187.2	150.0393	18.2530	I=24.7, R=24.8, g=25.1, u=24.9, z=21.0	SDSS
187.7	150.0336	18.3389	B2=20.5, R1=19.5, R2=19.1	USNO-B1
191.9	150.0290	18.2588	I=22.3, R=23.5, g=24.1, u=23.8, z=21.5	SDSS
193.0	150.0927	18.3456	I=20.9, R=21.4, g=22.7, u=23.3, z=20.5	SDSS
193.5	150.0931	18.3455	B2=21.4, I=18.3	USNO-B1
193.7	150.0106	18.2967	I=19.2, R=20.4, g=22.0, u=24.5, z=18.5	SDSS
198.8	150.0646	18.2425	I=22.3, R=25.0, g=25.9, u=25.1, z=22.1	SDSS
199.5	150.0672	18.2423	I=21.9, R=22.4, g=23.2, u=24.8, z=22.0	SDSS
199.6	150.0302	18.3405	B1=19.6, B2=17.9, I=16.9, R1=17.2, R2=17.2	USNO-B1
199.7	150.0302	18.3405	h=15.4, j=16.4, k=14.8	2MASS

Queried USNO-B1, SDSS, 2MASS.

* 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.