Swift Trigger: 420247;

Presumed name: GRB 100423A

BAT	09^h 05^m 54.48^s, +21° 28′ 44.4″
position:	(136.477, +21.479 ± 180″)
XRT	No position available.
UVOT	No position available.
Galactic N_HI:	0.00×10⁰ cm^-2
Galactic E(B-V):	0.041 mag

Best RA:	09^h 05^m 54.48^s	= 136.477 d
Best Dec:	+21° 28′ 44.4″	= +21.479 d

Gal Lat:
Gal Long:

Sun angle:	not found

Stars within 3.33 of BAT position

	RA*	Dec*		Catalogue
22.1	136.4735	21.4842	B1=12.3, B2=12.2, I=10.9, R1=11.2, R2=11.2	USNO-B1
22.2	136.4735	21.4842	h=10.2, j=10.5, k=10.2	2MASS
25.0	136.4714	21.4836	B1=18.8, R1=18.2	USNO-B1
32.0	136.4722	21.4713	I=20.7, R=21.3, g=22.8, u=24.2, z=20.3	SDSS
39.1	136.4666	21.4741	I=20.4, R=20.6, g=20.7, u=20.8, z=20.2	SDSS
40.7	136.4888	21.4764	I=14.5, R=14.1, g=16.0, u=16.4, z=14.7	SDSS
40.7	136.4888	21.4764	B1=14.3, B2=14.7, I=13.6, R1=13.9, R2=14.1	USNO-B1
40.8	136.4889	21.4764	h=12.7, j=13.0, k=12.6	2MASS
41.3	136.4825	21.4687	I=20.2, R=20.8, g=22.2, u=24.6, z=20.0	SDSS
43.8	136.4673	21.4872	I=20.0, R=20.2, g=20.0, u=20.3, z=19.6	SDSS
44.0	136.4673	21.4872	B1=19.5, B2=20.3	USNO-B1
46.6	136.4878	21.4871	I=16.8, R=17.5, g=19.0, u=21.6, z=16.4	SDSS
46.7	136.4879	21.4871	h=14.5, j=15.2, k=14.4	2MASS
46.9	136.4879	21.4872	B1=19.4, B2=19.0, I=16.4, R1=17.5, R2=17.2	USNO-B1
50.4	136.4687	21.4673	I=23.4, R=23.0, g=23.3, u=23.6, z=22.3	SDSS
52.7	136.4668	21.4901	I=23.8, R=24.4, g=24.6, u=22.6, z=23.1	SDSS
54.9	136.4767	21.4943	I=19.6, R=20.6, g=22.0, u=23.7, z=19.1	SDSS
68.4	136.4943	21.4689	I=24.6, R=24.1, g=25.5, u=25.6, z=20.5	SDSS
70.0	136.4631	21.4645	I=22.2, R=22.4, g=23.0, u=24.5, z=22.2	SDSS
70.7	136.4840	21.4975	I=22.8, R=23.2, g=23.3, u=22.7, z=22.8	SDSS
70.8	136.4970	21.4853	I=19.3, R=19.4, g=19.9, u=20.9, z=19.1	SDSS
74.5	136.4747	21.4584	I=21.7, R=21.7, g=22.2, u=23.2, z=21.5	SDSS
77.1	136.4550	21.4853	I=21.4, R=22.2, g=24.0, u=24.1, z=20.8	SDSS
79.4	136.4719	21.5005	I=21.3, R=25.6, g=25.1, u=23.9, z=23.3	SDSS
79.7	136.4818	21.5007	I=22.3, R=22.6, g=23.8, u=23.8, z=22.5	SDSS
81.8	136.4789	21.4563	I=22.9, R=23.0, g=23.4, u=23.2, z=21.8	SDSS
84.0	136.4994	21.4896	I=21.7, R=23.2, g=24.6, u=23.9, z=21.0	SDSS
84.1	136.4989	21.4676	I=22.3, R=25.4, g=25.9, u=25.5, z=21.9	SDSS
85.2	136.4754	21.5026	I=22.0, R=22.3, g=23.4, u=24.4, z=21.8	SDSS
85.3	136.4754	21.5027	I=21.9, R=22.2, g=23.2, u=24.9, z=20.9	SDSS
89.4	136.4834	21.4549	I=22.5, R=22.7, g=23.8, u=25.0, z=21.2	SDSS
89.8	136.4525	21.4892	I=23.4, R=23.7, g=23.5, u=25.1, z=23.2	SDSS
90.1	136.4510	21.4725	I=20.5, R=21.6, g=23.1, u=24.1, z=19.8	SDSS
91.8	136.4626	21.4573	I=19.1, R=19.8, g=21.2, u=24.4, z=18.8	SDSS
92.1	136.4500	21.4744	I=22.4, R=23.3, g=23.4, u=26.0, z=21.7	SDSS
98.9	136.4691	21.5055	I=20.9, R=22.0, g=23.6, u=24.3, z=20.3	SDSS
101.3	136.5010	21.4619	R1=19.2, R2=20.0	USNO-B1
104.4	136.4811	21.4502	I=21.4, R=22.9, g=24.5, u=24.8, z=20.5	SDSS
106.8	136.4567	21.5019	I=24.1, R=23.0, g=24.4, u=23.9, z=21.7	SDSS
107.3	136.4663	21.5071	I=19.6, R=20.8, g=22.3, u=24.2, z=19.0	SDSS
109.1	136.4508	21.4610	I=21.7, R=21.5, g=21.5, u=21.5, z=21.3	SDSS
113.1	136.4589	21.5055	I=22.4, R=23.4, g=24.8, u=24.6, z=22.3	SDSS
113.2	136.4750	21.5104	I=24.1, R=25.0, g=25.2, u=22.6, z=22.8	SDSS
117.0	136.4578	21.5061	I=25.0, R=22.8, g=25.3, u=24.2, z=23.4	SDSS
119.4	136.4933	21.5085	I=24.0, R=23.6, g=25.2, u=22.6, z=22.2	SDSS
120.9	136.4412	21.4831	I=24.7, R=25.9, g=25.3, u=22.5, z=23.2	SDSS
121.2	136.4678	21.5116	I=20.6, R=22.0, g=23.0, u=25.5, z=19.6	SDSS
121.2	136.4679	21.5116	I=20.4, R=21.8, g=23.6, u=23.9, z=19.6	SDSS
124.7	136.4476	21.5003	I=20.1, R=20.3, g=20.2, u=20.4, z=20.1	SDSS
124.7	136.4476	21.5003	I=20.1, R=20.2, g=20.2, u=20.4, z=19.6	SDSS
125.2	136.4475	21.5004	B1=20.3, B2=20.9	USNO-B1
127.6	136.5148	21.4748	I=19.2, R=20.3, g=21.8, u=24.7, z=18.5	SDSS
127.8	136.4723	21.5142	I=21.3, R=23.4, g=25.2, u=24.6, z=19.8	SDSS
127.9	136.4722	21.5142	I=21.2, R=24.2, g=25.0, u=24.2, z=19.7	SDSS
128.7	136.5152	21.4749	B1=20.4, I=18.9, R2=19.5	USNO-B1
129.0	136.4752	21.5148	I=23.3, R=23.6, g=23.5, u=23.6, z=21.7	SDSS
132.1	136.5091	21.5003	B1=17.4, B2=17.8, I=17.6, R1=18.2, R2=17.6	USNO-B1
132.1	136.5092	21.5003	I=17.6, R=17.7, g=18.1, u=19.2, z=17.5	SDSS
132.4	136.5092	21.5003	h=17.4, j=16.7, k=17.2	2MASS
135.0	136.5172	21.4819	I=21.3, R=22.4, g=24.2, u=24.2, z=20.6	SDSS
135.9	136.4604	21.4446	I=24.0, R=22.6, g=24.4, u=23.2, z=21.7	SDSS
138.3	136.4925	21.5146	B1=21.4, R2=20.0	USNO-B1
138.3	136.4357	21.4790	I=22.9, R=23.4, g=22.9, u=24.3, z=22.9	SDSS
139.7	136.4425	21.5009	I=22.4, R=24.2, g=24.3, u=24.6, z=22.9	SDSS
140.2	136.4960	21.4443	I=20.4, R=21.3, g=22.9, u=25.4, z=19.8	SDSS
142.1	136.4860	21.4404	I=19.5, R=20.9, g=22.6, u=23.3, z=18.8	SDSS
142.5	136.5186	21.4707	B1=20.5, I=19.1	USNO-B1
142.6	136.4691	21.5179	I=19.2, R=19.4, g=19.7, u=20.6, z=19.2	SDSS
142.6	136.4691	21.5179	I=19.2, R=19.4, g=19.7, u=20.6, z=19.2	SDSS
142.6	136.4554	21.4449	I=22.3, R=23.7, g=24.9, u=24.1, z=22.1	SDSS
142.6	136.4690	21.5179	B1=19.2, B2=20.6, I=19.0, R1=19.1, R2=19.5	USNO-B1
143.4	136.4866	21.4402	B1=19.9, B2=20.5, I=17.4, R1=18.8, R2=18.5	USNO-B1
143.7	136.5172	21.4929	I=17.4, R=18.0, g=19.4, u=22.1, z=17.0	SDSS
143.7	136.5172	21.4929	h=15.2, j=16.0, k=14.9	2MASS
143.8	136.5172	21.4930	B1=19.2, B2=19.6, I=17.2, R1=18.0, R2=17.9	USNO-B1
145.9	136.4787	21.5195	I=25.4, R=24.7, g=25.5, u=22.8, z=23.2	SDSS
146.8	136.5029	21.5119	I=20.4, R=21.5, g=23.2, u=24.0, z=19.8	SDSS
146.8	136.5030	21.5119	I=20.4, R=21.5, g=23.2, u=23.7, z=19.9	SDSS
148.4	136.4485	21.5106	I=19.7, R=19.9, g=20.2, u=21.3, z=19.5	SDSS
148.4	136.4870	21.5192	I=23.0, R=23.0, g=23.4, u=23.8, z=22.6	SDSS
148.4	136.4485	21.5106	I=19.7, R=19.8, g=20.2, u=21.2, z=19.6	SDSS
148.5	136.4485	21.5106	B1=20.3, B2=20.3, I=19.0, R1=19.6	USNO-B1
148.9	136.4533	21.4440	I=22.6, R=22.8, g=23.3, u=22.8, z=23.2	SDSS
149.0	136.4868	21.4386	I=22.1, R=23.4, g=24.1, u=24.7, z=21.4	SDSS
150.1	136.4888	21.5192	B1=18.1, B2=18.2, I=17.3, R1=17.9, R2=17.6	USNO-B1
151.7	136.4993	21.4423	h=16.0, j=17.1, k=15.4	2MASS
152.5	136.5014	21.4432	B1=16.0, B2=16.4, I=14.6, R1=14.9, R2=15.2	USNO-B1
152.6	136.5015	21.4433	h=13.2, j=13.7, k=13.1	2MASS
152.6	136.4993	21.4420	B1=19.8, B2=20.2, I=17.9, R1=18.4, R2=18.4	USNO-B1
152.8	136.5014	21.4432	I=14.9, R=15.2, g=16.1, u=18.3, z=14.7	SDSS
155.0	136.4307	21.4798	I=21.8, R=22.0, g=22.3, u=23.0, z=21.3	SDSS
155.0	136.4307	21.4799	I=21.6, R=21.6, g=22.1, u=23.2, z=21.8	SDSS
155.4	136.5220	21.4896	I=19.8, R=20.8, g=22.4, u=23.5, z=19.2	SDSS
156.7	136.5226	21.4887	B1=20.0, R1=19.7	USNO-B1
158.1	136.4308	21.4879	I=16.3, R=16.4, g=16.9, u=18.0, z=16.3	SDSS
158.1	136.4308	21.4880	h=14.9, j=15.4, k=14.8	2MASS
158.2	136.4308	21.4880	I=16.3, R=16.5, g=16.9, u=18.0, z=16.2	SDSS
158.2	136.4994	21.5177	B1=20.5, I=18.9	USNO-B1
158.4	136.4307	21.4880	B1=16.6, B2=16.6, I=16.1, R1=16.2, R2=16.4	USNO-B1
158.7	136.4579	21.4387	h=15.4, j=16.1, k=15.2	2MASS
158.8	136.4579	21.4387	I=17.9, R=18.8, g=20.2, u=22.2, z=17.4	SDSS
158.8	136.4578	21.4387	B1=20.0, B2=20.9, I=17.9, R1=18.7, R2=18.5	USNO-B1
159.4	136.4371	21.5031	I=13.0, R=14.9, g=15.8, u=16.4, z=13.3	SDSS
159.4	136.4371	21.5031	I=12.9, R=13.2, g=16.5, u=16.6, z=13.8	SDSS
159.5	136.4371	21.5031	B1=14.4, B2=14.4, I=12.7, R1=13.0, R2=13.4	USNO-B1
159.5	136.4371	21.5031	h=11.2, j=11.7, k=11.2	2MASS
160.1	136.4672	21.5225	I=24.2, R=25.7, g=24.9, u=24.4, z=20.7	SDSS
162.7	136.4865	21.4347	h=13.3, j=13.8, k=13.3	2MASS
162.8	136.4865	21.4346	B1=15.5, B2=16.1, I=14.6, R1=15.0, R2=15.0	USNO-B1
162.9	136.4865	21.4346	I=14.9, R=15.2, g=15.8, u=17.1, z=14.8	SDSS
163.7	136.4662	21.5233	I=22.4, R=22.9, g=23.9, u=23.9, z=21.7	SDSS
163.7	136.5140	21.5087	h=14.8, j=15.5, k=14.6	2MASS
163.8	136.5140	21.5087	I=17.2, R=18.2, g=19.7, u=22.2, z=16.7	SDSS
163.8	136.5140	21.5087	B1=19.7, B2=19.7, I=16.7, R1=18.4, R2=17.9	USNO-B1
164.1	136.4389	21.5076	I=24.8, R=25.1, g=25.4, u=22.8, z=22.9	SDSS
164.6	136.5205	21.4578	I=23.2, R=22.6, g=23.4, u=23.4, z=21.9	SDSS
165.0	136.4723	21.5246	B1=20.2, B2=20.9, R2=20.4	USNO-B1
165.1	136.4723	21.5247	I=20.7, R=20.6, g=20.6, u=21.5, z=20.1	SDSS
165.1	136.4723	21.5247	I=20.6, R=20.7, g=20.7, u=21.4, z=20.0	SDSS
165.7	136.5064	21.5160	I=25.3, R=25.3, g=25.1, u=22.3, z=21.7	SDSS
168.0	136.4366	21.5067	I=22.6, R=24.4, g=23.4, u=24.4, z=22.1	SDSS
168.8	136.4894	21.4335	B1=20.0, B2=20.4	USNO-B1
168.8	136.5165	21.5081	I=24.4, R=22.9, g=23.2, u=24.0, z=21.1	SDSS
171.1	136.5028	21.4380	I=18.8, R=19.1, g=19.7, u=21.5, z=18.8	SDSS
172.1	136.4902	21.4328	B1=19.5, I=16.1, R1=18.4, R2=18.0	USNO-B1
172.1	136.4902	21.4328	h=14.2, j=14.6, k=13.8	2MASS
172.5	136.4902	21.4327	I=16.9, R=18.3, g=19.8, u=22.2, z=16.1	SDSS
173.2	136.4564	21.5231	I=22.2, R=24.7, g=25.4, u=24.7, z=21.3	SDSS
175.5	136.4995	21.5230	I=20.1, R=21.4, g=22.7, u=24.4, z=19.4	SDSS
175.5	136.4995	21.5231	I=20.0, R=21.3, g=22.8, u=25.1, z=19.4	SDSS
178.7	136.4660	21.4304	I=22.2, R=23.6, g=24.3, u=24.2, z=21.4	SDSS
179.9	136.5012	21.4344	B1=20.5, B2=20.9, R1=19.5, R2=20.0	USNO-B1
180.1	136.5012	21.4343	I=20.0, R=20.2, g=20.6, u=21.6, z=19.9	SDSS
180.7	136.5075	21.4376	h=15.5, j=16.7, k=16.6	2MASS
180.9	136.5076	21.4376	B2=21.7, I=18.4, R1=19.3, R2=19.2	USNO-B1
181.0	136.5076	21.4375	I=18.4, R=19.3, g=20.9, u=23.4, z=17.8	SDSS
183.0	136.4349	21.4466	I=23.9, R=25.1, g=24.6, u=24.6, z=20.7	SDSS
183.0	136.5215	21.5085	h=10.4, j=10.6, k=10.4	2MASS
183.6	136.4417	21.4400	I=21.9, R=23.5, g=24.6, u=24.4, z=21.1	SDSS
185.5	136.4840	21.5301	I=21.4, R=22.9, g=24.2, u=24.3, z=20.4	SDSS
185.5	136.4840	21.5301	I=21.1, R=22.5, g=25.0, u=25.0, z=20.5	SDSS
185.8	136.4877	21.5296	I=22.2, R=22.3, g=23.5, u=23.6, z=21.5	SDSS
185.8	136.4877	21.5296	I=22.0, R=22.5, g=23.8, u=24.4, z=21.9	SDSS
187.2	136.5065	21.5231	B1=21.3, B2=20.2	USNO-B1
187.3	136.4419	21.5195	I=20.2, R=21.2, g=22.6, u=23.9, z=19.5	SDSS
187.3	136.4419	21.5195	I=20.1, R=21.4, g=22.7, u=24.0, z=19.5	SDSS
187.7	136.4531	21.4318	B2=20.1, I=16.2, R1=17.4, R2=17.7	USNO-B1
187.7	136.4531	21.4318	h=14.1, j=14.7, k=13.8	2MASS
187.9	136.4531	21.4318	I=16.7, R=18.0, g=19.5, u=22.1, z=16.0	SDSS
188.0	136.5019	21.5258	I=22.4, R=23.2, g=24.5, u=23.8, z=21.9	SDSS
189.4	136.5212	21.5118	B1=20.0, R1=19.0	USNO-B1
189.6	136.4223	21.4653	I=22.6, R=23.0, g=23.6, u=24.7, z=22.7	SDSS
191.2	136.5000	21.5276	I=15.9, R=16.5, g=18.1, u=21.3, z=15.6	SDSS
191.2	136.5000	21.5276	B1=18.7, B2=18.4, I=15.6, R1=16.4, R2=16.5	USNO-B1
191.3	136.5000	21.5276	I=16.0, R=16.6, g=18.0, u=21.5, z=15.6	SDSS
191.4	136.5000	21.5277	h=13.5, j=14.4, k=13.3	2MASS
191.5	136.5247	21.5084	B2=18.7, R1=18.4	USNO-B1
191.6	136.4427	21.5216	I=23.7, R=23.0, g=23.9, u=23.9, z=21.7	SDSS
192.5	136.5140	21.5199	I=21.7, R=24.6, g=24.3, u=25.1, z=23.2	SDSS
193.2	136.4802	21.4254	I=20.8, R=22.4, g=23.5, u=25.0, z=20.0	SDSS
193.4	136.5175	21.4407	I=22.2, R=22.4, g=23.1, u=23.8, z=21.4	SDSS
193.5	136.4260	21.5043	I=22.1, R=22.9, g=23.6, u=24.8, z=21.8	SDSS
196.8	136.5085	21.5251	I=24.4, R=23.0, g=24.5, u=25.4, z=22.3	SDSS
197.2	136.4499	21.5276	I=19.8, R=21.6, g=23.5, u=24.8, z=18.8	SDSS
197.3	136.4499	21.5277	I=19.8, R=21.8, g=23.4, u=24.5, z=18.9	SDSS
197.6	136.5148	21.5212	I=23.8, R=25.8, g=25.5, u=22.6, z=22.9	SDSS
198.3	136.4384	21.5207	I=18.5, R=19.6, g=21.1, u=23.5, z=17.8	SDSS
198.4	136.4384	21.5208	I=18.4, R=19.7, g=21.1, u=23.6, z=17.8	SDSS
198.7	136.4383	21.5208	h=15.5, j=16.7, k=15.4	2MASS
198.7	136.5031	21.4294	I=21.7, R=22.1, g=22.4, u=22.6, z=21.5	SDSS
198.9	136.4381	21.5208	B2=21.3, I=17.7, R1=18.8, R2=19.6	USNO-B1
199.2	136.5365	21.4780	I=21.0, R=21.8, g=23.2, u=24.5, z=21.0	SDSS
199.8	136.4645	21.5333	I=23.5, R=23.0, g=23.6, u=24.8, z=22.6	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.