Swift Trigger: 351588;

Presumed name: GRB 090510

BAT	22^h 14^m 13.20^s, -26° 36′ 21.6″
position:	(333.555, -26.606 ± 180″)
XRT	22^h 14^m 12.48^s, -26° 34′ 59.9″
position:	(333.5520, -26.5833 ± 2.1″)
UVOT	No position available.
Galactic N_HI:	0.00×10⁰ cm^-2
Galactic E(B-V):	0.020 mag

Best RA:	22^h 14^m 12.48^s	= 333.5520 d
Best Dec:	-26° 34′ 59.9″	= -26.5833 d

Gal Lat:
Gal Long:

Sun angle:	not found

Stars within 3.33 of XRT position

	RA*	Dec*		Catalogue
21.0	333.5540	-26.5888	B1=20.7, B2=20.9, R2=20.3	USNO-B1
23.2	333.5449	-26.5825	h=15.3, j=15.5, k=15.4	2MASS
23.2	333.5449	-26.5822	B1=19.0, B2=17.1, I=16.0, R1=15.5, R2=15.6	USNO-B1
24.5	333.5454	-26.5799	h=12.9, j=13.5, k=12.7	2MASS
24.6	333.5454	-26.5799	B1=20.3, B2=18.2, I=14.6, R1=15.4, R2=15.8	USNO-B1
36.6	333.5410	-26.5809	B2=22.1, R2=20.3	USNO-B1
38.2	333.5638	-26.5843	h=15.1, j=15.6, k=15.1	2MASS
38.4	333.5639	-26.5843	B1=19.5, B2=17.6, I=16.4, R1=15.8, R2=16.4	USNO-B1
40.8	333.5469	-26.5937	B2=18.9, R2=20.1	USNO-B1
41.1	333.5423	-26.5907	B1=18.2, B2=16.6, I=15.3, R1=14.7, R2=15.2	USNO-B1
41.3	333.5422	-26.5908	h=14.5, j=14.8, k=14.6	2MASS
45.4	333.5477	-26.5713	h=13.5, j=14.2, k=13.3	2MASS
45.6	333.5477	-26.5712	B1=20.3, B2=18.3, I=15.2, R1=15.7, R2=16.3	USNO-B1
59.0	333.5473	-26.5991	B1=20.4, B2=18.6, I=15.3, R1=16.2, R2=16.8	USNO-B1
59.2	333.5473	-26.5992	h=13.3, j=14.0, k=13.2	2MASS
60.2	333.5352	-26.5907	B2=21.5, I=18.5, R1=19.6, R2=19.4	USNO-B1
60.4	333.5352	-26.5908	h=16.2, j=16.6, k=17.2	2MASS
61.5	333.5685	-26.5919	B1=20.5, B2=18.8, I=23.1, R1=18.9, R2=19.1	USNO-B1
63.2	333.5690	-26.5922	B2=21.1, I=18.6, R2=20.2	USNO-B1
66.4	333.5709	-26.5760	B2=20.7, I=17.7, R1=19.1, R2=19.2	USNO-B1
66.6	333.5710	-26.5760	h=15.3, j=16.1, k=15.0	2MASS
68.1	333.5346	-26.5725	B2=21.5, R2=20.2	USNO-B1
72.0	333.5742	-26.5805	B2=14.7, I=18.2, R2=17.9	USNO-B1
73.1	333.5745	-26.5803	B1=20.3, B2=18.6, I=18.1, R1=18.0	USNO-B1
74.8	333.5752	-26.5818	I=19.3, R2=20.3	USNO-B1
75.5	333.5725	-26.5934	B2=17.1, R2=19.4	USNO-B1
75.7	333.5501	-26.5623	h=16.1, j=16.7, k=15.2	2MASS
76.2	333.5502	-26.5622	B2=19.7, I=17.8, R1=18.9, R2=18.6	USNO-B1
76.5	333.5336	-26.5968	B2=19.6, I=17.8, R1=18.5, R2=18.4	USNO-B1
77.0	333.5334	-26.5968	h=16.0, j=16.8, k=15.3	2MASS
77.3	333.5442	-26.6036	B1=20.8, B2=20.6, R1=19.7, R2=20.0	USNO-B1
77.4	333.5525	-26.5618	h=15.5, j=15.8, k=15.6	2MASS
77.8	333.5525	-26.5617	B1=16.9, B2=17.6, I=16.5, R1=16.1, R2=16.2	USNO-B1
80.5	333.5719	-26.5968	B2=21.5, R2=20.3	USNO-B1
82.9	333.5271	-26.5892	B2=20.9, I=18.8, R2=20.1	USNO-B1
86.6	333.5349	-26.6019	B1=20.5, B2=21.6, I=18.6	USNO-B1
87.4	333.5549	-26.6074	B1=20.5, B2=15.2	USNO-B1
90.6	333.5800	-26.5812	h=15.5, j=16.9, k=15.3	2MASS
91.1	333.5802	-26.5814	B2=20.3, I=17.6	USNO-B1
91.7	333.5804	-26.5813	B2=20.4, I=17.8, R2=17.4	USNO-B1
93.3	333.5790	-26.5738	B2=21.5, R1=18.1, R2=19.4	USNO-B1
95.4	333.5815	-26.5810	B2=15.5, I=18.4, R1=17.9, R2=18.6	USNO-B1
96.0	333.5284	-26.5996	B1=20.7, B2=22.1	USNO-B1
98.4	333.5297	-26.5646	B2=21.8, R2=19.4	USNO-B1
102.9	333.5666	-26.6087	B1=20.9, B2=21.3, R2=20.3	USNO-B1
104.2	333.5841	-26.5796	R1=19.5, R2=19.8	USNO-B1
108.0	333.5214	-26.5709	B1=20.4, B2=18.4, I=18.3, R1=18.4, R2=18.2	USNO-B1
108.4	333.5212	-26.5712	I=18.4, R1=19.8	USNO-B1
108.6	333.5184	-26.5858	B2=21.0, I=18.6, R2=20.4	USNO-B1
113.5	333.5854	-26.5933	B2=21.5, R2=20.2	USNO-B1
117.3	333.5313	-26.5565	B1=20.7, B2=20.9, I=18.8, R2=19.8	USNO-B1
118.8	333.5338	-26.6120	B2=21.3, R1=20.1, R2=20.3	USNO-B1
121.3	333.5171	-26.5959	B2=20.6, I=18.3, R1=19.5, R2=19.4	USNO-B1
121.9	333.5169	-26.5961	h=15.9, j=16.9, k=15.7	2MASS
127.7	333.5722	-26.6138	R1=19.9, R2=19.9	USNO-B1
136.6	333.5865	-26.5612	B2=21.5, R2=19.5	USNO-B1
137.4	333.5117	-26.5959	B1=20.5, B2=20.2, R1=20.1, R2=20.0	USNO-B1
137.7	333.5942	-26.5892	B2=19.9, I=18.7, R1=19.3, R2=19.4	USNO-B1
138.2	333.5730	-26.6168	B1=20.7, B2=20.9	USNO-B1
138.2	333.5944	-26.5896	B2=16.2, I=19.0, R1=19.7	USNO-B1
140.7	333.5449	-26.5447	h=16.0, j=16.4, k=15.7	2MASS
141.1	333.5448	-26.5446	B1=19.4, B2=19.3, I=17.9, R1=18.1, R2=18.5	USNO-B1
141.6	333.5294	-26.6171	B1=19.9, I=17.2, R1=16.8, R2=16.1	USNO-B1
141.8	333.5296	-26.6172	B1=20.3, B2=16.4, I=17.3, R1=17.8	USNO-B1
142.5	333.5293	-26.6173	B1=20.4, I=18.6	USNO-B1
143.9	333.5681	-26.5460	h=15.8, j=16.2, k=15.5	2MASS
144.0	333.5893	-26.5612	B1=14.0, B2=14.0, I=12.5, R1=12.4, R2=12.8	USNO-B1
144.0	333.5893	-26.5613	h=11.8, j=12.1, k=11.8	2MASS
144.2	333.5680	-26.5459	B2=20.1, I=18.2, R1=19.9, R2=19.7	USNO-B1
146.6	333.5975	-26.5825	I=18.6, R1=20.0, R2=19.4	USNO-B1
146.6	333.5197	-26.6121	R1=19.6, R2=20.4	USNO-B1
147.2	333.5411	-26.6230	B1=20.7, B2=21.7, I=18.9, R2=19.9	USNO-B1
148.9	333.5719	-26.6207	B2=21.6, R2=20.0	USNO-B1
149.4	333.5894	-26.5587	I=18.9, R2=18.0	USNO-B1
149.6	333.5133	-26.6063	B1=20.7, B2=20.6, I=18.7, R2=20.2	USNO-B1
149.8	333.5060	-26.5895	B1=20.1, B2=17.9, I=15.7, R1=16.0, R2=16.1	USNO-B1
149.9	333.5060	-26.5896	h=14.3, j=14.8, k=14.2	2MASS
150.1	333.5503	-26.6250	B2=18.3, R2=20.2	USNO-B1
151.5	333.5895	-26.5579	B1=18.9, B2=18.3, I=18.6, R1=18.7, R2=18.6	USNO-B1
151.5	333.5888	-26.5571	B1=20.4, I=18.6	USNO-B1
153.7	333.5091	-26.5646	B1=20.8, R2=20.3	USNO-B1
153.8	333.5462	-26.5409	h=12.8, j=13.3, k=12.6	2MASS
154.1	333.5462	-26.5408	B1=17.4, B2=17.6, I=14.3, R1=15.1, R2=15.3	USNO-B1
154.2	333.5721	-26.5444	h=14.8, j=15.4, k=14.5	2MASS
154.7	333.5721	-26.5443	B1=20.6, B2=19.9, I=16.6, R1=18.1, R2=18.2	USNO-B1
154.7	333.5961	-26.5663	B2=19.3, I=18.2, R1=19.1, R2=18.8	USNO-B1
155.6	333.5127	-26.6084	B2=22.1, R2=19.9	USNO-B1
156.3	333.5831	-26.5500	B2=20.5, R1=19.7, R2=20.3	USNO-B1
157.2	333.5170	-26.6137	B2=21.2, I=18.0, R1=19.2, R2=18.4	USNO-B1
158.0	333.5181	-26.6151	B1=20.5, B2=19.9, I=18.1, R1=19.0, R2=18.5	USNO-B1
159.5	333.5837	-26.5493	B1=20.5, B2=21.8	USNO-B1
160.4	333.5097	-26.5598	B2=20.6, I=18.8, R2=20.1	USNO-B1
164.3	333.5303	-26.6246	B1=19.5, B2=17.4, I=14.6, R1=14.6, R2=15.2	USNO-B1
164.6	333.5302	-26.6247	h=13.5, j=14.2, k=13.4	2MASS
164.7	333.5165	-26.6162	B2=21.3, R1=19.3, R2=20.2	USNO-B1
165.1	333.5401	-26.6279	B2=20.9, I=19.1, R2=20.1	USNO-B1
166.0	333.6030	-26.5765	B1=21.0, B2=19.8, I=18.1, R1=18.9, R2=18.7	USNO-B1
166.2	333.5402	-26.6283	B1=20.4, B2=19.7, I=18.7, R1=19.0, R2=19.0	USNO-B1
166.3	333.6031	-26.5765	h=15.7, j=16.9, k=15.4	2MASS
169.2	333.5066	-26.6071	R1=20.0, R2=19.8	USNO-B1
169.4	333.6015	-26.5993	B2=16.0, R2=20.2	USNO-B1
169.5	333.6016	-26.5991	B2=20.6, I=18.9, R1=19.5, R2=19.3	USNO-B1
170.8	333.5117	-26.5524	B1=20.7, R2=23.6	USNO-B1
172.4	333.5348	-26.5379	B2=20.7, I=18.8, R1=19.9, R2=19.7	USNO-B1
172.9	333.5346	-26.5379	R1=19.6, R2=19.4	USNO-B1
173.2	333.5676	-26.5373	B1=19.5, R1=20.0	USNO-B1
173.7	333.5020	-26.5653	B2=23.1, R1=20.0, R2=19.2	USNO-B1
173.9	333.4986	-26.5763	B2=21.0, I=18.7, R1=19.7	USNO-B1
173.9	333.5595	-26.6311	B2=22.7, R1=19.4, R2=20.3	USNO-B1
174.7	333.6050	-26.5731	I=18.5, R2=19.1	USNO-B1
176.6	333.6055	-26.5723	B2=20.2, R1=19.1	USNO-B1
178.0	333.5107	-26.6162	B2=21.2, I=18.8, R2=19.9	USNO-B1
179.0	333.5761	-26.6281	B2=22.7, R1=19.5	USNO-B1
183.0	333.5030	-26.6090	B1=20.4, B2=19.0, I=18.4, R1=18.9, R2=18.6	USNO-B1
184.2	333.6011	-26.6096	I=19.2, R2=20.3	USNO-B1
186.7	333.5843	-26.6264	I=18.8, R2=20.3	USNO-B1
191.2	333.6105	-26.5739	B1=21.0, B2=16.0	USNO-B1
191.3	333.5494	-26.5302	h=15.8, j=16.8, k=15.5	2MASS
191.4	333.5928	-26.5446	B2=21.9, I=18.5, R1=19.0, R2=19.3	USNO-B1
192.4	333.5318	-26.5330	B1=20.0, B2=22.9	USNO-B1
193.8	333.4924	-26.5759	B1=21.0, B2=20.5, R2=19.8	USNO-B1
193.9	333.5104	-26.5443	I=18.8, R2=20.3	USNO-B1
193.9	333.5103	-26.5445	h=15.9, j=17.3, k=15.8	2MASS
195.1	333.6095	-26.6003	B1=20.7, B2=21.9, R2=20.4	USNO-B1
196.3	333.5071	-26.6202	B2=17.4, I=19.2, R1=19.6	USNO-B1
198.9	333.4967	-26.6078	B1=20.6, B2=21.2, R2=20.2	USNO-B1
200.0	333.5209	-26.5352	B1=19.3, B2=18.9, I=17.8, R1=18.6, R2=18.2	USNO-B1

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.