Swift Trigger: 420367;

Presumed name: GRB 100424A

BAT	13^h 57^m 48.72^s, +01° 30′ 46.8″
position:	(209.453, 1.513 ± 180″)
XRT	13^h 57^m 47.47^s, +01° 32′ 19.0″
position:	(209.4478, 1.5386 ± 2.1″)
UVOT	No position available.
Galactic N_HI:	0.00×10⁰ cm^-2
Galactic E(B-V):	0.034 mag

Best RA:	13^h 57^m 47.47^s	= 209.4478 d
Best Dec:	+01° 32′ 19.0″	= 1.5386 d

Gal Lat:
Gal Long:

Sun angle:	not found

Stars within 3.33 of XRT position

	RA*	Dec*		Catalogue
31.2	209.4391	1.5385	I=20.5, R=21.6, g=23.0, u=25.1, z=20.1	SDSS
32.7	209.4451	1.5299	B1=15.5, B2=15.5, I=14.2, R1=15.1, R2=14.8	USNO-B1
32.7	209.4451	1.5299	h=13.8, j=14.0, k=13.7	2MASS
32.8	209.4388	1.5400	B2=21.4, R1=19.5	USNO-B1
32.9	209.4450	1.5299	I=14.8, R=15.0, g=15.2, u=16.2, z=14.8	SDSS
35.6	209.4427	1.5471	I=18.6, R=19.7, g=21.0, u=22.7, z=18.0	SDSS
36.0	209.4427	1.5472	B2=21.0, I=17.9, R1=19.3, R2=19.7	USNO-B1
37.9	209.4583	1.5381	B1=20.6, I=18.9, R2=19.9	USNO-B1
41.2	209.4412	1.5480	B1=20.3, B2=19.8, I=18.1, R1=19.2, R2=18.4	USNO-B1
44.8	209.4552	1.5486	I=21.6, R=22.9, g=23.9, u=24.3, z=20.7	SDSS
46.2	209.4359	1.5433	I=21.6, R=22.9, g=24.1, u=23.9, z=20.8	SDSS
46.3	209.4355	1.5350	I=22.1, R=23.4, g=24.5, u=26.4, z=21.0	SDSS
48.9	209.4603	1.5333	I=21.4, R=22.2, g=23.5, u=23.6, z=20.6	SDSS
51.6	209.4335	1.5387	I=20.2, R=21.5, g=23.3, u=25.9, z=19.5	SDSS
58.8	209.4528	1.5231	I=18.9, R2=20.2	USNO-B1
60.0	209.4313	1.5362	I=23.2, R=22.9, g=22.9, u=22.6, z=21.8	SDSS
60.1	209.4352	1.5495	B1=18.4, B2=19.4, R2=19.8	USNO-B1
60.2	209.4350	1.5494	I=19.5, R=19.4, g=19.3, u=20.7, z=19.5	SDSS
61.9	209.4455	1.5215	I=21.7, R=22.9, g=25.2, u=24.2, z=20.7	SDSS
62.6	209.4409	1.5226	h=15.7, j=15.9, k=15.3	2MASS
62.7	209.4408	1.5226	I=18.1, R=19.4, g=20.7, u=22.9, z=17.4	SDSS
62.8	209.4409	1.5226	B1=20.7, B2=21.0, I=17.2, R1=19.4, R2=19.3	USNO-B1
67.3	209.4353	1.5247	I=22.5, R=23.2, g=22.8, u=26.0, z=22.0	SDSS
76.3	209.4396	1.5581	I=17.5, R=18.2, g=19.5, u=22.0, z=17.2	SDSS
76.6	209.4396	1.5582	h=15.4, j=15.9, k=15.2	2MASS
76.6	209.4396	1.5583	B1=20.2, B2=19.8, I=17.4, R1=18.1, R2=17.8	USNO-B1
77.3	209.4631	1.5235	I=22.4, R=22.0, g=22.8, u=24.4, z=23.4	SDSS
77.3	209.4528	1.5177	B1=20.7, B2=20.4, I=17.1, R1=18.3, R2=18.0	USNO-B1
77.5	209.4528	1.5177	h=14.9, j=15.5, k=14.8	2MASS
77.6	209.4528	1.5176	I=17.3, R=18.4, g=19.8, u=22.4, z=16.7	SDSS
77.7	209.4660	1.5270	I=19.5, R=19.6, g=19.6, u=19.9, z=19.3	SDSS
77.9	209.4661	1.5270	B1=20.1, B2=19.5, R2=19.7	USNO-B1
80.3	209.4380	1.5186	B1=20.4, B2=21.8, I=18.8, R1=19.8, R2=20.8	USNO-B1
84.6	209.4672	1.5519	B2=20.2, I=18.8, R1=19.5, R2=19.4	USNO-B1
85.0	209.4712	1.5350	B2=20.8, I=18.9, R1=19.7, R2=19.7	USNO-B1
89.3	209.4638	1.5576	I=24.7, R=22.5, g=24.4, u=23.6, z=23.6	SDSS
93.7	209.4417	1.5133	R1=20.1, R2=20.7	USNO-B1
94.1	209.4231	1.5471	I=24.8, R=25.1, g=26.0, u=21.7, z=22.0	SDSS
94.3	209.4464	1.5124	I=20.7, R=21.9, g=23.3, u=24.6, z=20.2	SDSS
95.3	209.4638	1.5175	I=21.8, R=21.7, g=22.2, u=24.4, z=21.4	SDSS
97.2	209.4544	1.5648	I=21.0, R=21.0, g=21.7, u=23.3, z=20.6	SDSS
98.2	209.4582	1.5134	I=19.4, R=20.4, g=21.9, u=23.0, z=18.9	SDSS
98.4	209.4373	1.5638	I=24.4, R=24.4, g=23.0, u=25.1, z=22.3	SDSS
99.3	209.4291	1.5183	B2=20.1, I=18.8, R1=19.1, R2=19.1	USNO-B1
99.4	209.4291	1.5183	I=18.8, R=19.2, g=20.1, u=22.2, z=18.7	SDSS
103.6	209.4636	1.5627	I=20.8, R=22.0, g=24.0, u=25.0, z=20.7	SDSS
105.1	209.4188	1.5420	B1=13.3, B2=13.5, I=12.9, R1=13.5, R2=13.2	USNO-B1
105.3	209.4187	1.5420	h=12.7, j=12.7, k=12.6	2MASS
105.4	209.4187	1.5420	I=13.4, R=14.1, g=13.2, u=14.4, z=13.5	SDSS
107.2	209.4639	1.5636	I=20.7, R=22.0, g=23.3, u=24.0, z=19.6	SDSS
108.0	209.4709	1.5578	I=20.3, R=21.9, g=23.7, u=22.8, z=19.4	SDSS
110.1	209.4605	1.5664	I=22.0, R=22.5, g=23.1, u=23.7, z=22.2	SDSS
111.0	209.4760	1.5261	I=16.4, R=17.2, g=18.7, u=21.4, z=15.9	SDSS
111.0	209.4760	1.5261	B1=19.5, B2=18.6, I=15.6, R1=17.0, R2=16.9	USNO-B1
111.1	209.4760	1.5261	h=14.0, j=14.7, k=13.9	2MASS
115.1	209.4330	1.5670	I=17.9, R=18.1, g=18.5, u=19.6, z=17.8	SDSS
115.4	209.4331	1.5671	B1=18.9, B2=18.5, I=17.6, R1=18.2, R2=17.9	USNO-B1
116.1	209.4262	1.5625	I=18.8, R2=20.3	USNO-B1
118.1	209.4155	1.5442	B2=20.5, I=18.1, R1=19.3, R2=18.7	USNO-B1
118.3	209.4154	1.5441	h=16.2, j=16.4, k=15.1	2MASS
118.6	209.4153	1.5441	I=18.4, R=19.2, g=20.7, u=23.5, z=17.9	SDSS
119.0	209.4155	1.5456	h=15.3, j=15.9, k=15.3	2MASS
119.1	209.4154	1.5456	I=17.9, R=19.4, g=20.7, u=22.4, z=17.2	SDSS
119.7	209.4805	1.5323	I=21.1, R=21.5, g=22.2, u=23.8, z=20.9	SDSS
121.5	209.4173	1.5242	B1=16.8, B2=16.8, I=15.5, R1=16.0, R2=15.9	USNO-B1
121.5	209.4173	1.5241	h=14.8, j=15.0, k=14.6	2MASS
121.6	209.4173	1.5241	I=16.0, R=16.2, g=16.7, u=18.0, z=15.9	SDSS
121.8	209.4318	1.5684	I=20.9, R=21.5, g=22.1, u=24.8, z=20.6	SDSS
122.6	209.4610	1.5072	B1=20.4, B2=20.7, R1=19.9, R2=20.1	USNO-B1
123.0	209.4609	1.5071	I=19.9, R=20.0, g=20.5, u=21.6, z=19.9	SDSS
123.2	209.4356	1.5066	I=20.1, R=20.9, g=22.0, u=25.7, z=19.9	SDSS
126.1	209.4813	1.5489	I=20.5, R=20.8, g=20.9, u=21.2, z=20.4	SDSS
126.5	209.4795	1.5234	B1=19.7, B2=20.3, R2=20.3	USNO-B1
126.5	209.4794	1.5233	I=19.8, R=20.0, g=19.9, u=20.0, z=19.7	SDSS
127.1	209.4129	1.5439	I=24.3, R=25.3, g=24.4, u=24.5, z=20.6	SDSS
128.0	209.4131	1.5465	I=20.9, R=21.6, g=22.8, u=24.7, z=20.7	SDSS
128.5	209.4755	1.5611	I=22.5, R=22.4, g=23.3, u=24.3, z=22.9	SDSS
128.8	209.4540	1.5738	I=22.4, R=23.3, g=23.0, u=25.1, z=22.4	SDSS
130.3	209.4813	1.5524	I=21.6, R=22.0, g=23.2, u=24.4, z=20.7	SDSS
133.5	209.4446	1.5756	I=21.9, R=22.0, g=22.5, u=22.6, z=22.2	SDSS
134.7	209.4277	1.5702	B2=20.8, R2=19.5	USNO-B1
137.0	209.4272	1.5066	B2=20.9, R1=20.0, R2=19.9	USNO-B1
138.9	209.4856	1.5463	I=24.4, R=25.5, g=25.9, u=25.7, z=20.6	SDSS
140.5	209.4622	1.5749	I=19.3, R=19.4, g=19.8, u=20.7, z=19.2	SDSS
140.5	209.4290	1.5728	I=22.1, R=23.0, g=24.3, u=24.9, z=20.9	SDSS
140.7	209.4621	1.5750	B1=20.1, B2=20.0, I=18.6, R1=19.3, R2=19.6	USNO-B1
141.6	209.4722	1.5695	I=20.7, R=22.7, g=23.9, u=24.5, z=19.5	SDSS
145.2	209.4421	1.5785	I=23.3, R=24.9, g=26.0, u=26.7, z=20.6	SDSS
145.7	209.4163	1.5640	h=13.1, j=13.6, k=12.9	2MASS
145.8	209.4162	1.5639	I=15.4, R=16.2, g=17.7, u=20.4, z=14.9	SDSS
145.9	209.4162	1.5640	B1=18.2, B2=17.8, I=14.5, R1=16.0, R2=15.9	USNO-B1
146.7	209.4103	1.5545	I=22.1, R=22.8, g=23.8, u=23.9, z=21.8	SDSS
148.1	209.4879	1.5477	B2=21.2, I=18.9, R1=19.6, R2=20.2	USNO-B1
152.0	209.4306	1.5772	B1=19.0, B2=18.8, I=17.2, R1=18.4, R2=17.7	USNO-B1
154.3	209.4059	1.5477	I=20.7, R=21.8, g=23.8, u=25.8, z=20.0	SDSS
155.2	209.4899	1.5479	I=19.0, R=19.3, g=19.9, u=21.4, z=19.0	SDSS
156.6	209.4912	1.5349	I=22.3, R=25.4, g=25.7, u=23.4, z=23.2	SDSS
157.8	209.4487	1.5824	I=24.6, R=25.1, g=24.7, u=23.3, z=20.5	SDSS
158.2	209.4911	1.5312	I=22.1, R=23.0, g=23.2, u=23.0, z=21.9	SDSS
158.4	209.4745	1.5736	I=22.8, R=22.3, g=23.6, u=22.9, z=21.5	SDSS
159.0	209.4590	1.4959	I=21.5, R=22.9, g=23.2, u=24.9, z=21.0	SDSS
160.4	209.4922	1.5348	I=22.2, R=25.3, g=25.3, u=25.7, z=22.7	SDSS
162.2	209.4827	1.5671	I=20.6, R=20.7, g=21.0, u=21.6, z=20.3	SDSS
162.3	209.4058	1.5221	I=24.4, R=22.8, g=24.2, u=24.2, z=22.1	SDSS
162.4	209.4028	1.5345	B1=20.8, B2=20.1, I=18.9, R1=19.5, R2=19.7	USNO-B1
162.8	209.4903	1.5541	I=22.1, R=25.1, g=25.9, u=25.6, z=20.2	SDSS
162.8	209.4068	1.5194	I=21.6, R=23.3, g=24.5, u=23.8, z=20.9	SDSS
163.1	209.4830	1.5672	B1=20.8, B2=21.0, R2=20.0	USNO-B1
163.3	209.4874	1.5164	I=21.6, R=22.5, g=24.2, u=23.2, z=21.2	SDSS
163.7	209.4929	1.5330	I=24.9, R=23.4, g=26.0, u=21.5, z=22.3	SDSS
165.9	209.4162	1.5050	I=22.0, R=23.8, g=24.7, u=25.2, z=21.2	SDSS
166.1	209.4042	1.5537	B1=19.4, B2=18.5, I=17.4, R1=17.8, R2=17.7	USNO-B1
166.2	209.4025	1.5478	I=20.4, R=20.6, g=20.6, u=21.0, z=20.5	SDSS
166.3	209.4803	1.5058	B1=16.7, B2=16.4, I=14.3, R1=15.3, R2=15.0	USNO-B1
166.4	209.4803	1.5057	I=14.8, R=15.2, g=16.2, u=18.7, z=14.7	SDSS
166.4	209.4804	1.5058	h=13.0, j=13.6, k=12.9	2MASS
166.6	209.4024	1.5479	B1=20.2, B2=20.8, R2=20.3	USNO-B1
166.6	209.4596	1.4939	B2=20.8, I=18.5, R1=19.6, R2=19.8	USNO-B1
167.5	209.4456	1.4921	I=19.6, R=20.7, g=22.0, u=23.8, z=19.0	SDSS
168.1	209.4367	1.5839	I=21.7, R=22.3, g=23.2, u=25.0, z=21.4	SDSS
168.8	209.4648	1.5823	I=24.0, R=25.2, g=24.4, u=25.2, z=20.5	SDSS
170.2	209.4721	1.5792	I=20.9, R=21.3, g=21.8, u=22.7, z=21.6	SDSS
172.1	209.4888	1.5140	I=22.4, R=22.5, g=23.3, u=23.4, z=24.2	SDSS
173.4	209.4140	1.5730	B2=21.9, R1=19.7, R2=20.6	USNO-B1
174.6	209.4403	1.4907	I=19.0, R2=20.2	USNO-B1
174.9	209.4502	1.4901	B1=20.7, B2=20.1, I=18.9, R1=19.2, R2=19.2	USNO-B1
175.0	209.4266	1.5823	I=19.1, R=20.3, g=21.6, u=25.3, z=18.3	SDSS
176.1	209.4049	1.5622	I=18.8, R1=19.4, R2=20.6	USNO-B1
176.2	209.4274	1.5831	B1=20.4, B2=22.0, I=18.3, R2=20.3	USNO-B1
176.5	209.4716	1.5815	I=21.3, R=22.0, g=23.5, u=25.2, z=20.4	SDSS
176.6	209.3988	1.5372	B2=21.6, I=19.0	USNO-B1
177.8	209.4821	1.5741	B2=21.8, R1=19.5, R2=20.2	USNO-B1
178.4	209.4045	1.5628	I=19.3, R=20.5, g=22.1, u=22.9, z=18.5	SDSS
178.7	209.4139	1.5748	I=24.6, R=24.5, g=23.0, u=24.9, z=23.9	SDSS
179.2	209.4132	1.5744	I=20.3, R=21.6, g=23.1, u=24.5, z=19.4	SDSS
179.3	209.4836	1.5039	I=19.8, R=21.0, g=22.3, u=25.4, z=19.3	SDSS
179.7	209.4618	1.5865	h=16.3, j=17.2, k=15.8	2MASS
180.3	209.4246	1.5830	I=24.0, R=24.3, g=25.8, u=22.7, z=20.8	SDSS
180.8	209.4615	1.5869	I=19.5, R=21.2, g=22.8, u=25.1, z=18.5	SDSS
180.9	209.4893	1.5103	I=20.7, R=21.0, g=21.3, u=22.9, z=20.6	SDSS
183.0	209.3976	1.5302	I=24.4, R=24.6, g=24.3, u=26.1, z=20.6	SDSS
183.4	209.4532	1.4880	I=22.3, R=22.4, g=22.7, u=23.9, z=21.8	SDSS
184.5	209.4008	1.5590	I=23.2, R=22.6, g=23.3, u=25.0, z=22.0	SDSS
186.4	209.4687	1.5860	I=22.3, R=22.1, g=23.2, u=22.8, z=21.1	SDSS
187.4	209.4975	1.5229	I=23.1, R=23.4, g=22.8, u=25.7, z=22.3	SDSS
187.8	209.4993	1.5303	B1=20.9, R1=20.1	USNO-B1
189.6	209.3976	1.5227	I=22.3, R=22.8, g=22.9, u=23.0, z=21.3	SDSS
189.7	209.4935	1.5648	I=17.5, R=18.4, g=19.9, u=22.3, z=17.0	SDSS
189.9	209.4935	1.5649	B2=20.4, I=17.1, R1=18.3, R2=18.2	USNO-B1
190.0	209.4224	1.4923	I=20.5, R=21.1, g=22.2, u=23.0, z=19.9	SDSS
190.0	209.4936	1.5649	h=15.1, j=15.8, k=15.1	2MASS
192.1	209.4084	1.5025	I=21.4, R=21.4, g=21.9, u=22.1, z=21.5	SDSS
192.6	209.4900	1.5715	B2=21.5, I=18.7, R1=20.1, R2=20.4	USNO-B1
194.6	209.5019	1.5376	B2=21.9, R1=19.8, R2=20.7	USNO-B1
195.1	209.4803	1.5820	I=24.0, R=23.7, g=25.9, u=23.3, z=20.6	SDSS
195.7	209.4732	1.4905	B2=19.8, I=18.2, R1=19.4, R2=19.0	USNO-B1
195.9	209.4003	1.5120	B1=19.4, B2=19.5, I=18.4, R1=18.7, R2=18.9	USNO-B1
196.0	209.4003	1.5119	I=18.6, R=18.8, g=19.3, u=20.5, z=18.5	SDSS
197.7	209.5023	1.5316	I=20.8, R=22.0, g=23.4, u=24.5, z=20.4	SDSS
198.1	209.4266	1.4878	I=21.7, R=22.5, g=23.9, u=26.0, z=20.9	SDSS
199.0	209.3925	1.5400	I=20.1, R=20.2, g=20.5, u=21.4, z=19.8	SDSS
199.1	209.3925	1.5400	B1=20.4, B2=20.6, R1=20.1, R2=20.2	USNO-B1
199.1	209.5030	1.5350	I=23.0, R=22.5, g=23.8, u=22.8, z=21.5	SDSS
199.5	209.4628	1.4852	I=22.0, R=23.3, g=24.6, u=26.5, z=21.9	SDSS
199.8	209.4731	1.4892	I=22.0, R=22.6, g=22.7, u=24.1, z=21.3	SDSS

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.