Swift Trigger: 350311;

Presumed name: GRB 090424

BAT	12^h 38^m 09.12^s, +16° 49′ 44.4″
position:	(189.538, +16.829 ± 180″)
XRT	12^h 38^m 05.34^s, +16° 50′ 12.9″
position:	(189.52224, 16.83692 ± 4.1″)
UVOT	No position available.
Galactic N_HI:	0.00×10⁰ cm^-2
Galactic E(B-V):	0.025 mag

Best RA:	12^h 38^m 05.34^s	= 189.52224 d
Best Dec:	+16° 50′ 12.9″	= 16.83692 d

Gal Lat:
Gal Long:

Sun angle:	not found

Stars within 3.33 of XRT position

	RA*	Dec*		Catalogue
16.4	189.5184	16.8396	I=20.1, R=20.4, g=21.2, u=23.6, z=20.0	SDSS
17.2	189.5183	16.8399	B1=20.3, B2=20.1, I=19.0, R2=19.7	USNO-B1
20.3	189.5223	16.8313	I=19.7, R=20.8, g=22.1, u=24.6, z=19.1	SDSS
22.3	189.5240	16.8429	B1=20.6, I=18.8	USNO-B1
27.9	189.5206	16.8293	I=22.0, R=21.9, g=22.3, u=22.9, z=22.5	SDSS
28.2	189.5256	16.8441	I=22.4, R=22.7, g=22.9, u=22.5, z=22.7	SDSS
31.5	189.5167	16.8439	I=18.9, R1=19.4, R2=19.5	USNO-B1
32.4	189.5315	16.8353	I=23.6, R=23.0, g=25.5, u=25.3, z=22.5	SDSS
38.0	189.5326	16.8404	I=14.8, R=15.8, g=17.2, u=19.9, z=14.3	SDSS
38.1	189.5327	16.8404	h=12.3, j=12.9, k=12.1	2MASS
38.8	189.5329	16.8405	B1=18.4, B2=17.8, I=13.4, R1=15.3, R2=15.2	USNO-B1
39.9	189.5316	16.8435	I=19.8, R=20.9, g=22.5, u=26.0, z=19.4	SDSS
41.0	189.5159	16.8466	I=19.1, R=19.2, g=19.4, u=20.4, z=19.1	SDSS
41.3	189.5160	16.8467	B1=19.9, B2=20.1, I=18.6, R1=18.9, R2=19.1	USNO-B1
47.7	189.5357	16.8399	I=15.9, R=13.7, g=15.3, u=17.3, z=13.1	SDSS
47.9	189.5358	16.8399	B1=15.8, B2=15.4, I=12.1, R1=13.2, R2=13.2	USNO-B1
48.0	189.5358	16.8399	h=11.0, j=11.6, k=10.9	2MASS
55.5	189.5271	16.8222	I=24.3, R=25.6, g=25.2, u=24.5, z=20.7	SDSS
59.0	189.5167	16.8524	I=24.4, R=25.4, g=24.6, u=26.2, z=21.1	SDSS
62.1	189.5381	16.8452	I=20.7, R=21.2, g=20.9, u=20.8, z=20.9	SDSS
67.5	189.5338	16.8521	I=24.6, R=25.0, g=25.1, u=25.2, z=21.6	SDSS
68.9	189.5190	16.8558	I=23.2, R=23.3, g=23.1, u=22.6, z=22.7	SDSS
71.1	189.5413	16.8294	B2=20.4, I=19.0, R2=19.5	USNO-B1
71.6	189.5097	16.8528	B1=20.2, B2=20.5, I=18.0, R1=18.8, R2=18.5	USNO-B1
71.8	189.5096	16.8528	h=16.5, j=16.8, k=17.3	2MASS
71.8	189.5096	16.8528	I=18.3, R=18.8, g=19.8, u=22.5, z=18.1	SDSS
73.3	189.5435	16.8381	I=22.6, R=22.8, g=23.2, u=23.9, z=22.4	SDSS
74.0	189.5398	16.8250	I=22.0, R=22.3, g=22.8, u=24.2, z=21.4	SDSS
75.8	189.5291	16.8169	B2=19.8, R2=19.6	USNO-B1
78.2	189.5337	16.8181	I=20.8, R=22.0, g=23.6, u=24.8, z=20.1	SDSS
78.2	189.5337	16.8182	I=20.6, R=21.6, g=23.1, u=25.6, z=19.8	SDSS
79.2	189.5174	16.8584	B1=20.6, B2=19.3, I=18.9, R2=19.7	USNO-B1
81.9	189.4990	16.8417	I=24.0, R=25.9, g=24.8, u=22.5, z=23.3	SDSS
84.6	189.5236	16.8135	I=22.2, R=22.3, g=23.3, u=23.1, z=21.4	SDSS
85.1	189.5375	16.8183	I=23.8, R=23.3, g=23.3, u=23.6, z=21.8	SDSS
86.2	189.5182	16.8606	I=25.2, R=25.3, g=25.1, u=22.7, z=23.8	SDSS
88.3	189.5054	16.8184	B2=20.0, R2=19.6	USNO-B1
93.6	189.4973	16.8266	I=22.8, R=23.4, g=23.3, u=24.0, z=22.4	SDSS
95.0	189.5498	16.8361	B1=20.6, B2=20.6, R2=19.0	USNO-B1
95.4	189.5306	16.8622	I=24.6, R=24.5, g=26.1, u=22.1, z=22.7	SDSS
95.6	189.4956	16.8444	B1=20.6, B2=19.8, I=18.7, R2=19.6	USNO-B1
95.9	189.5417	16.8178	h=16.5, j=16.7, k=16.1	2MASS
96.1	189.5417	16.8178	I=17.8, R=17.9, g=18.2, u=19.2, z=17.7	SDSS
96.2	189.5417	16.8178	I=17.7, R=17.8, g=18.1, u=19.1, z=17.7	SDSS
96.3	189.5418	16.8178	B1=18.8, B2=18.9, I=17.3, R1=17.7, R2=17.6	USNO-B1
98.2	189.5507	16.8361	B2=19.9, R1=19.6	USNO-B1
102.6	189.5293	16.8646	I=23.4, R=25.2, g=25.4, u=22.2, z=22.4	SDSS
103.3	189.5163	16.8651	I=22.8, R=23.0, g=23.6, u=22.4, z=21.9	SDSS
105.5	189.5323	16.8646	I=25.1, R=25.3, g=25.1, u=22.3, z=22.6	SDSS
108.1	189.5342	16.8647	I=25.5, R=25.0, g=25.1, u=21.9, z=24.1	SDSS
110.9	189.5479	16.8183	I=22.6, R=23.1, g=23.1, u=24.0, z=21.9	SDSS
111.1	189.5480	16.8183	I=22.3, R=22.6, g=23.2, u=24.5, z=22.1	SDSS
112.4	189.5446	16.8142	B1=20.2, B2=20.3, I=18.8, R1=18.7, R2=19.4	USNO-B1
112.5	189.5445	16.8141	I=19.4, R=19.5, g=19.8, u=20.9, z=19.3	SDSS
112.5	189.5446	16.8141	I=19.3, R=19.5, g=19.8, u=20.8, z=19.3	SDSS
112.9	189.4900	16.8428	I=20.7, R=21.8, g=23.3, u=23.8, z=20.0	SDSS
113.2	189.4901	16.8305	I=21.1, R=22.9, g=24.1, u=25.8, z=20.0	SDSS
113.6	189.4895	16.8410	B2=18.4, R1=19.0	USNO-B1
116.2	189.4899	16.8276	I=22.6, R=22.6, g=23.5, u=25.7, z=21.5	SDSS
117.6	189.5564	16.8377	B2=20.6, I=18.4, R2=19.6	USNO-B1
117.7	189.5409	16.8643	I=24.7, R=26.0, g=25.4, u=22.7, z=22.5	SDSS
118.0	189.5165	16.8692	B1=20.6, B2=20.6, I=19.0	USNO-B1
118.6	189.5476	16.8592	B2=19.8, I=18.4, R2=19.7	USNO-B1
119.7	189.5039	16.8651	I=24.4, R=24.5, g=25.8, u=22.4, z=21.7	SDSS
120.1	189.5535	16.8516	B2=20.2, R2=19.6	USNO-B1
120.1	189.5458	16.8615	B1=20.4, R1=19.2, R2=19.6	USNO-B1
120.4	189.5510	16.8559	I=22.6, R=24.5, g=25.7, u=25.9, z=22.9	SDSS
125.0	189.5574	16.8286	I=20.5, R=21.0, g=21.8, u=24.6, z=20.5	SDSS
125.0	189.4995	16.8640	h=15.1, j=15.7, k=14.9	2MASS
125.0	189.5356	16.8692	B2=19.7, I=17.7	USNO-B1
125.1	189.4995	16.8640	I=16.8, R=17.0, g=17.9, u=20.1, z=16.6	SDSS
125.2	189.4995	16.8641	B1=18.9, B2=18.8, I=16.1, R1=16.5, R2=16.7	USNO-B1
125.5	189.5062	16.8682	I=22.6, R=22.8, g=24.0, u=24.5, z=21.7	SDSS
125.7	189.5573	16.8467	I=19.5, R=20.7, g=22.1, u=23.4, z=18.9	SDSS
126.1	189.5538	16.8191	I=24.5, R=25.3, g=24.8, u=25.4, z=19.1	SDSS
127.9	189.5475	16.8630	h=14.2, j=14.9, k=13.9	2MASS
128.1	189.5475	16.8630	B1=18.6, B2=16.3, I=14.0, R1=15.9, R2=14.5	USNO-B1
128.6	189.5471	16.8635	I=20.9, R=23.4, g=25.1, u=24.0, z=22.8	SDSS
129.0	189.5545	16.8188	I=22.0, R=22.2, g=23.0, u=26.1, z=21.8	SDSS
129.1	189.5545	16.8188	I=22.1, R=22.2, g=23.0, u=23.3, z=21.4	SDSS
129.4	189.5168	16.8725	h=11.4, j=11.6, k=11.4	2MASS
129.6	189.5167	16.8725	I=12.6, R=12.7, g=13.2, u=15.1, z=13.6	SDSS
129.6	189.5168	16.8725	B1=13.9, B2=13.4, I=11.6, R1=12.6, R2=12.3	USNO-B1
129.9	189.4900	16.8182	I=22.0, R=23.4, g=23.3, u=25.0, z=21.7	SDSS
132.0	189.5421	16.8056	I=24.5, R=25.5, g=25.1, u=23.5, z=20.7	SDSS
133.1	189.5481	16.8644	I=24.5, R=24.8, g=25.1, u=21.8, z=21.4	SDSS
133.7	189.4908	16.8152	I=23.0, R=23.0, g=23.4, u=23.9, z=22.2	SDSS
134.1	189.5507	16.8623	I=23.8, R=24.5, g=24.8, u=22.5, z=22.6	SDSS
135.2	189.4859	16.8510	B1=20.6, B2=19.8, R1=18.2	USNO-B1
135.6	189.5480	16.8084	B1=20.4, B2=20.6, I=18.9, R1=19.0, R2=19.4	USNO-B1
135.9	189.5480	16.8084	I=19.2, R=19.5, g=20.4, u=22.7, z=18.9	SDSS
137.1	189.5205	16.7989	I=20.9, R=21.6, g=23.1, u=23.7, z=20.5	SDSS
137.8	189.5504	16.8641	I=24.7, R=24.7, g=24.8, u=22.1, z=22.4	SDSS
138.0	189.5342	16.8003	I=23.8, R=25.8, g=24.7, u=23.8, z=20.7	SDSS
143.1	189.4932	16.8654	I=24.1, R=24.2, g=25.1, u=22.6, z=22.9	SDSS
143.1	189.4843	16.8207	I=24.1, R=24.5, g=23.4, u=25.7, z=23.2	SDSS
143.2	189.4876	16.8150	I=24.3, R=24.9, g=23.5, u=25.8, z=23.1	SDSS
143.5	189.5301	16.7978	B2=20.1, I=18.9, R2=19.7	USNO-B1
143.5	189.5109	16.7986	B2=20.3, I=18.9, R1=19.6, R2=19.4	USNO-B1
143.5	189.4808	16.8327	I=20.3, R=20.6, g=21.9, u=24.2, z=19.7	SDSS
143.9	189.4807	16.8327	B2=20.3, I=19.0, R2=19.7	USNO-B1
144.6	189.4816	16.8270	I=20.1, R=20.3, g=20.5, u=21.6, z=20.0	SDSS
144.7	189.4815	16.8270	B1=20.4, B2=20.6, I=19.0, R2=19.6	USNO-B1
146.3	189.5619	16.8514	I=23.6, R=25.2, g=24.9, u=25.1, z=20.9	SDSS
148.1	189.5187	16.7959	B1=20.5, B2=20.5, I=18.5, R1=19.2, R2=19.4	USNO-B1
149.0	189.5496	16.8690	B1=20.6, I=18.7	USNO-B1
149.8	189.4800	16.8273	B1=20.5, B2=20.6, I=19.0, R1=19.3, R2=19.6	USNO-B1
150.1	189.4798	16.8275	B1=20.6, R2=19.4	USNO-B1
151.1	189.4976	16.8022	I=22.3, R=23.1, g=22.8, u=23.5, z=22.4	SDSS
151.2	189.5499	16.8695	B1=20.2, B2=20.6, I=17.9	USNO-B1
151.3	189.5653	16.8286	I=22.2, R=22.1, g=22.5, u=23.6, z=22.4	SDSS
151.5	189.5500	16.8696	I=23.4, R=24.6, g=23.1, u=24.6, z=21.5	SDSS
152.3	189.4867	16.8117	I=22.1, R=22.1, g=22.2, u=23.2, z=23.8	SDSS
153.1	189.5666	16.8389	I=22.0, R=22.6, g=23.9, u=24.5, z=21.4	SDSS
154.6	189.5079	16.7962	B1=18.2, B2=18.3, I=16.2, R1=16.9, R2=16.9	USNO-B1
154.7	189.5591	16.8614	I=21.6, R=21.6, g=22.1, u=22.8, z=21.9	SDSS
154.8	189.5079	16.7961	I=16.9, R=17.1, g=17.5, u=18.9, z=16.8	SDSS
155.0	189.5079	16.7961	h=15.8, j=15.8, k=15.3	2MASS
155.1	189.5084	16.8779	I=22.6, R=22.9, g=24.5, u=23.6, z=21.9	SDSS
157.5	189.5655	16.8512	I=21.9, R=22.0, g=22.2, u=23.6, z=21.8	SDSS
161.8	189.5475	16.8749	B2=20.5, I=19.0, R2=19.5	USNO-B1
162.8	189.5395	16.7948	B2=19.7, I=18.9, R2=19.6	USNO-B1
163.2	189.4750	16.8398	I=24.8, R=24.7, g=24.5, u=22.7, z=22.7	SDSS
165.1	189.5610	16.8638	I=24.9, R=24.0, g=25.8, u=22.6, z=23.1	SDSS
165.4	189.5591	16.8075	I=23.5, R=25.1, g=24.6, u=25.7, z=20.7	SDSS
166.3	189.5571	16.8050	I=21.2, R=21.6, g=22.0, u=23.6, z=21.2	SDSS
167.8	189.5709	16.8348	B2=19.3, I=19.0	USNO-B1
169.6	189.5714	16.8341	B2=20.4, I=18.6, R1=19.3, R2=19.4	USNO-B1
169.6	189.5714	16.8340	I=19.7, R=19.9, g=20.3, u=21.5, z=19.7	SDSS
170.5	189.4730	16.8420	B1=20.6, B2=20.5, R2=19.7	USNO-B1
171.3	189.4823	16.8652	B1=20.6, R1=19.4	USNO-B1
172.2	189.4786	16.8137	I=19.5, R=19.7, g=20.0, u=21.2, z=19.4	SDSS
172.4	189.4785	16.8137	B1=20.5, B2=20.4, I=18.8, R2=19.6	USNO-B1
175.9	189.4774	16.8603	I=23.3, R=23.0, g=23.9, u=23.3, z=22.4	SDSS
176.8	189.4831	16.8052	B1=18.2, B2=18.1, I=15.4, R1=16.0, R2=16.1	USNO-B1
176.8	189.4831	16.8052	I=16.1, R=16.5, g=17.2, u=19.0, z=15.9	SDSS
176.8	189.4831	16.8052	h=14.3, j=14.9, k=14.3	2MASS
177.3	189.5171	16.7879	I=21.1, R=21.4, g=22.6, u=24.7, z=20.4	SDSS
177.6	189.5265	16.7878	B2=18.6, R2=19.4	USNO-B1
178.9	189.5064	16.8842	I=21.0, R=22.7, g=24.1, u=24.1, z=20.2	SDSS
179.4	189.5433	16.7914	B2=20.0, R2=19.6	USNO-B1
180.6	189.5666	16.8637	I=23.9, R=24.3, g=25.1, u=22.3, z=22.4	SDSS
180.7	189.5033	16.8837	B2=19.9, I=19.0, R2=19.2	USNO-B1
180.9	189.5036	16.8839	I=20.8, R=21.2, g=22.5, u=23.2, z=20.3	SDSS
181.9	189.5153	16.8870	I=22.0, R=22.6, g=23.4, u=25.0, z=21.6	SDSS
182.3	189.4789	16.8660	I=24.6, R=24.5, g=24.8, u=22.4, z=22.2	SDSS
182.4	189.5751	16.8352	B2=20.3, R1=19.6	USNO-B1
183.0	189.4728	16.8184	I=22.3, R=22.5, g=22.9, u=22.9, z=22.9	SDSS
183.1	189.4727	16.8185	I=22.4, R=22.5, g=23.3, u=24.6, z=23.1	SDSS
183.5	189.5036	16.8847	I=22.1, R=22.3, g=22.6, u=22.8, z=21.5	SDSS
183.5	189.5755	16.8359	I=20.6, R=20.8, g=21.1, u=22.1, z=20.7	SDSS
183.7	189.4930	16.7943	B2=20.6, I=18.6, R1=19.4, R2=19.2	USNO-B1
184.8	189.4708	16.8225	I=21.8, R=22.8, g=25.0, u=26.1, z=20.8	SDSS
185.6	189.5681	16.8639	I=25.2, R=25.1, g=25.3, u=22.7, z=21.9	SDSS
185.9	189.4764	16.8097	I=22.8, R=22.7, g=23.2, u=26.1, z=23.8	SDSS
189.2	189.5694	16.8639	I=24.2, R=24.8, g=24.2, u=22.7, z=23.4	SDSS
189.9	189.5767	16.8451	I=22.6, R=22.4, g=22.7, u=23.4, z=21.6	SDSS
190.7	189.5774	16.8410	B1=20.6, B2=20.3, I=18.4, R1=19.2, R2=19.0	USNO-B1
191.2	189.4689	16.8222	B1=20.5, B2=20.2, R2=19.4	USNO-B1
191.6	189.5702	16.8639	I=24.1, R=25.4, g=26.1, u=22.1, z=23.7	SDSS
191.7	189.4889	16.8796	h=15.2, j=16.0, k=15.2	2MASS
191.8	189.4889	16.8796	B1=20.6, B2=20.5, I=16.7, R1=18.2, R2=18.2	USNO-B1
191.8	189.4889	16.8796	I=17.6, R=18.5, g=19.9, u=22.9, z=17.1	SDSS
192.0	189.4787	16.8702	I=19.7, R=21.3, g=22.8, u=24.5, z=18.8	SDSS
192.3	189.4742	16.8641	I=23.2, R=24.8, g=24.5, u=22.5, z=22.4	SDSS
193.3	189.5033	16.7864	B1=20.5, B2=19.7, R2=19.6	USNO-B1
193.4	189.5034	16.7863	I=20.7, R=20.9, g=21.2, u=22.8, z=20.7	SDSS
193.8	189.4748	16.8658	I=24.2, R=25.3, g=25.1, u=22.7, z=21.9	SDSS
194.3	189.5312	16.7836	B1=19.1, B2=18.9, I=15.3, R1=16.3, R2=16.6	USNO-B1
194.7	189.5312	16.7835	I=16.3, R=16.8, g=18.0, u=20.5, z=15.9	SDSS
194.7	189.5312	16.7835	h=14.2, j=14.8, k=14.0	2MASS
194.8	189.5021	16.8875	I=22.4, R=22.7, g=23.6, u=24.2, z=22.0	SDSS
194.8	189.5155	16.8907	B1=20.6, B2=20.6, I=18.2	USNO-B1
195.4	189.5116	16.7836	B1=20.6, B2=20.0, R2=19.7	USNO-B1
195.7	189.5592	16.8782	B2=19.8, I=18.6, R2=19.4	USNO-B1
196.1	189.5250	16.7825	I=21.8, R=23.1, g=23.9, u=25.5, z=21.2	SDSS
196.4	189.5786	16.8447	I=22.7, R=22.7, g=24.9, u=25.3, z=21.7	SDSS
196.6	189.5765	16.8200	B2=18.9, R2=19.5	USNO-B1
198.6	189.5401	16.7845	B2=19.8, I=18.6, R1=19.4, R2=19.6	USNO-B1
198.9	189.5402	16.7844	I=19.3, R=19.8, g=21.1, u=23.7, z=19.0	SDSS
199.5	189.4690	16.8151	I=24.8, R=22.7, g=26.2, u=23.9, z=21.7	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.