Swift Trigger: 373458;

Presumed name: GRB 091020

BAT	11^h 42^m 51.60^s, +50° 58′ 19.2″
position:	(175.715, +50.972 ± 180″)
XRT	11^h 42^m 55.20^s, +50° 58′ 41.9″
position:	(175.7300, 50.9783 ± 2.1″)
UVOT	No position available.
Galactic N_HI:	0.00×10⁰ cm^-2
Galactic E(B-V):	0.017 mag

Best RA:	11^h 42^m 55.20^s	= 175.7300 d
Best Dec:	+50° 58′ 41.9″	= 50.9783 d

Gal Lat:
Gal Long:

Sun angle:	not found

Stars within 3.33 of XRT position

	RA*	Dec*		Catalogue
7.8	175.7318	50.9801	I=21.3, R=23.2, g=25.6, u=25.8, z=20.4	SDSS
10.5	175.7334	50.9763	B1=20.6, B2=21.0, R1=20.2, R2=19.9	USNO-B1
11.2	175.7336	50.9762	I=20.5, R=20.6, g=20.9, u=21.5, z=20.3	SDSS
18.0	175.7379	50.9783	B2=20.4, R2=20.0	USNO-B1
23.8	175.7240	50.9729	I=21.8, R=22.1, g=23.1, u=23.2, z=21.3	SDSS
24.4	175.7194	50.9797	I=22.4, R=24.8, g=26.2, u=25.8, z=23.1	SDSS
28.3	175.7298	50.9862	I=22.1, R=24.0, g=25.7, u=24.9, z=23.6	SDSS
29.0	175.7211	50.9841	I=21.9, R=22.8, g=23.4, u=25.1, z=21.8	SDSS
30.1	175.7428	50.9805	I=18.3, R1=19.8	USNO-B1
35.7	175.7410	50.9712	B2=21.0, I=19.2, R1=19.7	USNO-B1
45.7	175.7205	50.9895	B2=19.4, R1=20.3	USNO-B1
49.1	175.7273	50.9918	I=22.4, R=25.7, g=24.5, u=24.3, z=22.6	SDSS
52.3	175.7485	50.9870	B2=19.4, I=19.1, R2=20.0	USNO-B1
52.9	175.7088	50.9844	I=22.5, R=24.7, g=26.0, u=25.4, z=22.7	SDSS
58.1	175.7506	50.9879	I=22.3, R=24.0, g=24.4, u=24.8, z=22.4	SDSS
60.6	175.7122	50.9909	B2=21.0, I=18.6, R1=19.4, R2=19.2	USNO-B1
61.1	175.7141	50.9646	B1=20.6, R1=20.3	USNO-B1
62.0	175.7201	50.9944	I=22.0, R=23.4, g=23.5, u=23.9, z=21.9	SDSS
63.8	175.7535	50.9881	I=22.4, R=25.7, g=26.2, u=24.3, z=23.0	SDSS
70.4	175.7537	50.9656	I=22.0, R=22.6, g=24.0, u=23.5, z=21.0	SDSS
72.8	175.7012	50.9693	B2=20.2, I=18.8, R1=20.1	USNO-B1
72.9	175.7272	50.9985	I=22.2, R=23.4, g=23.4, u=24.0, z=21.7	SDSS
73.5	175.7011	50.9690	B1=20.6, B2=20.7, I=18.0, R1=18.4, R2=19.1	USNO-B1
86.1	175.6937	50.9854	B2=18.1, R1=20.1	USNO-B1
86.3	175.7084	50.9980	I=23.7, R=24.5, g=25.9, u=24.1, z=21.0	SDSS
89.1	175.6913	50.9826	I=22.5, R=22.7, g=24.0, u=23.8, z=21.8	SDSS
94.7	175.6996	50.9963	B2=20.8, R2=19.6	USNO-B1
97.0	175.7087	50.9549	B1=20.9, B2=21.0, R2=19.8	USNO-B1
98.2	175.6871	50.9744	I=19.3, R=19.2, g=19.5, u=19.8, z=19.1	SDSS
98.7	175.6868	50.9746	B1=20.4, B2=20.7, I=18.6, R1=19.7, R2=19.3	USNO-B1
99.0	175.6866	50.9749	B1=21.0, B2=20.3, I=19.2, R2=19.5	USNO-B1
99.4	175.7113	50.9533	I=21.3, R=22.5, g=24.8, u=23.7, z=20.5	SDSS
100.7	175.6857	50.9758	I=17.9, R=18.5, g=19.8, u=22.3, z=17.6	SDSS
100.8	175.6857	50.9759	B1=20.4, B2=20.1, I=17.9, R1=18.3, R2=18.6	USNO-B1
101.0	175.6856	50.9757	h=15.7, j=16.4, k=15.3	2MASS
101.2	175.7000	50.9991	I=12.5, R=12.6, g=13.3, u=15.1, z=13.6	SDSS
101.2	175.7000	50.9991	h=11.4, j=11.6, k=11.3	2MASS
101.4	175.7574	51.0006	I=21.9, R=24.4, g=25.0, u=24.6, z=22.8	SDSS
103.7	175.7574	50.9552	I=22.0, R=23.6, g=23.9, u=24.8, z=21.5	SDSS
104.0	175.7394	51.0066	B1=21.0, B2=20.9, R2=20.0	USNO-B1
104.7	175.7685	50.9622	B2=20.4, I=19.2, R2=20.0	USNO-B1
105.2	175.7615	50.9568	B2=21.6, R1=20.2	USNO-B1
105.8	175.7766	50.9798	I=21.8, R=22.3, g=23.1, u=22.8, z=21.8	SDSS
107.0	175.7507	50.9516	B1=20.8, B2=21.2, I=19.4, R1=19.8, R2=19.9	USNO-B1
107.2	175.7506	50.9515	I=19.7, R=20.1, g=21.1, u=23.0, z=19.4	SDSS
107.8	175.7739	50.9898	I=22.3, R=25.7, g=25.5, u=23.8, z=23.1	SDSS
108.7	175.6967	50.9566	B1=15.7, B2=16.2, I=14.5, R1=15.0, R2=15.6	USNO-B1
108.8	175.6821	50.9804	B1=20.6, B2=21.0, R1=19.9, R2=20.0	USNO-B1
108.8	175.6967	50.9565	I=15.2, R=15.4, g=15.8, u=17.0, z=15.2	SDSS
109.1	175.6966	50.9565	h=14.1, j=14.4, k=14.0	2MASS
111.8	175.7180	50.9482	I=21.6, R=21.9, g=22.5, u=23.7, z=21.3	SDSS
113.1	175.7220	50.9473	B1=20.4, B2=20.4, I=18.8, R1=19.4, R2=19.8	USNO-B1
119.5	175.7255	51.0114	I=24.1, R=23.7, g=23.9, u=22.3, z=22.6	SDSS
120.2	175.6773	50.9822	I=22.2, R=22.5, g=24.0, u=25.4, z=22.1	SDSS
122.7	175.7675	51.0029	I=22.5, R=24.4, g=25.2, u=25.1, z=23.0	SDSS
124.3	175.7814	50.9903	I=22.3, R=24.0, g=23.8, u=23.7, z=22.4	SDSS
125.3	175.7504	51.0106	I=21.9, R=22.6, g=22.8, u=24.0, z=21.8	SDSS
125.7	175.7243	51.0130	h=15.1, j=15.6, k=15.0	2MASS
125.8	175.7244	51.0131	I=17.8, R=19.2, g=20.6, u=23.0, z=17.1	SDSS
126.2	175.7243	51.0132	B1=20.6, B2=21.0, I=17.4, R1=19.1, R2=19.4	USNO-B1
126.5	175.7218	51.0131	B2=21.0, R2=19.9	USNO-B1
129.1	175.7549	50.9460	B1=20.7, B2=20.8, R2=19.9	USNO-B1
130.4	175.7601	50.9474	I=22.9, R=22.8, g=23.3, u=24.2, z=22.3	SDSS
131.4	175.6758	50.9912	B1=20.6, I=18.2	USNO-B1
133.1	175.6854	50.9542	B1=21.0, B2=21.7	USNO-B1
133.2	175.6753	50.9918	I=22.0, R=23.2, g=24.1, u=24.6, z=21.2	SDSS
134.5	175.7796	50.9578	B1=16.0, B2=16.2, I=13.8, R1=14.6, R2=15.0	USNO-B1
134.7	175.7796	50.9577	h=12.9, j=13.4, k=12.9	2MASS
134.7	175.7797	50.9578	I=14.5, R=14.8, g=15.7, u=17.9, z=14.4	SDSS
134.7	175.6910	51.0065	I=21.8, R=22.2, g=23.0, u=23.3, z=21.5	SDSS
136.3	175.7886	50.9698	I=23.4, R=22.7, g=24.7, u=24.9, z=21.5	SDSS
138.8	175.7428	50.9406	B2=20.6, I=19.2, R1=20.1, R2=19.7	USNO-B1
139.1	175.7431	50.9406	B2=21.8, I=19.0	USNO-B1
139.3	175.7429	50.9405	I=19.4, R=20.0, g=21.3, u=23.5, z=19.1	SDSS
139.7	175.6752	50.9605	B2=20.4, R1=20.0, R2=20.0	USNO-B1
139.8	175.7883	50.9910	I=22.0, R=24.3, g=24.6, u=23.9, z=23.3	SDSS
140.7	175.7824	50.9992	B1=21.0, R1=20.0	USNO-B1
140.9	175.6952	50.9459	B2=18.5, R1=19.9, R2=20.8	USNO-B1
141.7	175.7317	50.9389	B1=20.9, B2=23.2, R1=20.2	USNO-B1
141.8	175.6726	50.9625	B2=20.8, R1=20.1, R2=20.0	USNO-B1
142.1	175.6919	51.0096	B1=21.0, B2=19.8	USNO-B1
142.2	175.7050	51.0145	h=14.2, j=14.9, k=14.1	2MASS
142.3	175.7050	51.0146	I=16.5, R=17.1, g=18.5, u=21.1, z=16.1	SDSS
142.6	175.7050	51.0146	B1=19.4, B2=19.4, I=15.7, R1=16.7, R2=17.3	USNO-B1
143.3	175.7646	50.9450	I=22.1, R=23.8, g=25.0, u=23.6, z=21.5	SDSS
143.3	175.7868	50.9958	I=19.3, R=20.7, g=22.2, u=24.8, z=18.6	SDSS
143.6	175.6716	50.9937	B1=20.8, B2=20.5, I=18.1, R1=18.9, R2=18.9	USNO-B1
144.2	175.6884	51.0086	I=22.0, R=22.7, g=23.2, u=25.8, z=22.3	SDSS
145.1	175.7799	50.9531	I=22.2, R=23.2, g=25.0, u=25.5, z=21.4	SDSS
145.1	175.6710	50.9940	B1=20.9, B2=21.0, I=18.5	USNO-B1
145.6	175.6694	50.9917	B2=20.2, I=19.3, R2=20.0	USNO-B1
146.1	175.6672	50.9875	I=22.4, R=23.6, g=25.2, u=25.9, z=22.4	SDSS
148.4	175.7210	50.9375	B1=19.9, B2=19.9, I=19.0, R1=19.0, R2=19.4	USNO-B1
148.9	175.7956	50.9804	B1=21.0, B2=21.1, R1=18.9, R2=20.3	USNO-B1
150.6	175.6732	50.9566	B2=20.6, R1=19.7, R2=20.0	USNO-B1
152.7	175.6750	50.9538	B2=20.9, I=19.0, R1=19.9, R2=19.7	USNO-B1
154.3	175.6992	51.0165	B2=19.8, R2=19.9	USNO-B1
157.0	175.6675	50.9595	I=22.6, R=23.0, g=23.0, u=23.6, z=22.6	SDSS
157.2	175.7509	51.0199	B2=20.4, R2=20.0	USNO-B1
157.8	175.6706	51.0012	B1=20.8, B2=20.5, R2=19.6	USNO-B1
158.4	175.6602	50.9771	h=16.1, j=17.2, k=15.3	2MASS
158.6	175.7900	51.0009	h=14.6, j=15.0, k=14.6	2MASS
158.7	175.7901	51.0009	I=15.9, R=16.1, g=16.7, u=18.3, z=15.8	SDSS
158.9	175.6599	50.9773	B1=20.2, B2=20.5, I=18.4, R1=18.7, R2=18.4	USNO-B1
163.4	175.7189	50.9335	I=21.7, R=21.9, g=23.3, u=25.5, z=22.4	SDSS
164.4	175.7993	50.9918	I=21.9, R=25.1, g=26.3, u=25.4, z=22.7	SDSS
164.5	175.7363	51.0238	I=22.3, R=22.7, g=23.6, u=24.5, z=21.5	SDSS
165.0	175.6607	50.9642	B2=20.6, R1=20.0, R2=20.0	USNO-B1
165.3	175.7895	51.0049	B2=21.9, R2=20.0	USNO-B1
167.2	175.6996	51.0206	I=24.0, R=25.0, g=25.1, u=22.5, z=22.1	SDSS
167.6	175.6683	50.9526	R1=20.3, R2=20.0	USNO-B1
169.4	175.6680	50.9521	R1=20.0, R2=20.5	USNO-B1
170.3	175.8035	50.9685	B2=19.0, I=15.3, R2=17.4	USNO-B1
170.4	175.8035	50.9684	I=16.2, R=17.4, g=18.9, u=21.7, z=15.5	SDSS
170.4	175.8035	50.9683	h=13.6, j=14.2, k=13.3	2MASS
170.5	175.7552	50.9337	I=25.4, R=22.8, g=25.3, u=24.5, z=22.8	SDSS
170.6	175.6675	50.9520	B2=21.4, R1=20.1, R2=19.9	USNO-B1
171.1	175.6676	51.0051	B1=20.9, B2=21.0, R2=19.9	USNO-B1
171.6	175.7010	51.0223	B2=20.8, R2=20.0	USNO-B1
172.3	175.6667	50.9517	B2=20.9, R1=19.8, R2=20.5	USNO-B1
172.5	175.6590	50.9612	B1=20.6, B2=19.8, I=15.5, R1=18.0, R2=18.0	USNO-B1
172.6	175.6590	50.9610	h=13.5, j=14.1, k=13.3	2MASS
172.8	175.6589	50.9610	I=16.4, R=18.1, g=19.6, u=22.3, z=15.5	SDSS
173.4	175.6668	50.9512	B2=20.9, R1=20.2, R2=19.7	USNO-B1
174.7	175.8039	50.9646	I=22.2, R=23.1, g=23.2, u=25.6, z=21.3	SDSS
174.7	175.6529	50.9796	I=23.1, R=22.6, g=23.7, u=24.9, z=22.9	SDSS
175.5	175.6819	51.0165	B2=20.9, I=18.9, R1=19.1, R2=19.6	USNO-B1
176.6	175.8069	50.9703	B2=20.8, I=18.6, R1=19.0, R2=18.2	USNO-B1
177.4	175.8071	50.9698	B1=19.8, B2=20.7, I=18.7, R1=16.3, R2=18.0	USNO-B1
178.7	175.6971	51.0234	I=21.3, R=22.6, g=24.5, u=24.7, z=20.4	SDSS
178.8	175.7964	51.0051	I=23.5, R=24.8, g=24.5, u=24.8, z=21.1	SDSS
183.0	175.7676	50.9333	B1=19.9, B2=20.8, R2=19.6	USNO-B1
183.4	175.7680	50.9333	B1=20.5, B2=20.6, I=19.3, R1=19.2, R2=19.8	USNO-B1
183.4	175.6570	51.0003	I=17.8, R=19.2, g=20.7, u=22.5, z=17.1	SDSS
183.5	175.6570	51.0003	h=14.8, j=15.7, k=14.8	2MASS
184.0	175.6568	51.0004	B2=21.0, I=17.2, R2=18.8	USNO-B1
184.2	175.6496	50.9858	I=25.3, R=24.9, g=26.0, u=22.3, z=22.8	SDSS
185.6	175.6991	51.0261	I=25.6, R=23.9, g=23.3, u=24.5, z=22.6	SDSS
185.9	175.6485	50.9725	I=22.9, R=24.2, g=25.5, u=22.4, z=22.8	SDSS
186.4	175.6754	51.0170	B2=20.1, R2=20.0	USNO-B1
187.4	175.7399	51.0300	I=22.5, R=22.6, g=23.5, u=24.7, z=22.5	SDSS
187.9	175.8028	50.9534	B2=20.2, I=19.1, R1=20.0, R2=20.0	USNO-B1
188.4	175.8130	50.9754	B2=21.1, R1=19.4, R2=20.0	USNO-B1
188.5	175.8030	50.9532	I=19.2, R=20.4, g=21.9, u=25.1, z=18.6	SDSS
188.5	175.6741	51.0170	B2=20.3, R2=20.6	USNO-B1
188.5	175.8113	50.9674	B1=20.6, B2=20.3, I=19.2, R1=19.0, R2=19.4	USNO-B1
189.0	175.6498	50.9928	I=18.7, R2=20.8	USNO-B1
191.0	175.7791	50.9352	B1=20.9, B2=21.0	USNO-B1
191.6	175.7917	50.9420	I=22.0, R=23.1, g=23.9, u=25.0, z=20.9	SDSS
191.7	175.6511	50.9975	I=24.7, R=25.4, g=23.9, u=22.1, z=23.2	SDSS
191.8	175.6727	51.0175	B2=20.6, I=19.4, R2=20.4	USNO-B1
192.7	175.8101	50.9605	I=20.7, R=20.7, g=21.1, u=22.1, z=20.6	SDSS
192.7	175.8101	50.9605	B2=21.1, R2=20.0	USNO-B1
193.7	175.8154	50.9801	B2=20.7, R2=20.7	USNO-B1
193.8	175.7535	50.9265	I=23.8, R=25.1, g=24.1, u=22.2, z=23.2	SDSS
193.8	175.7897	51.0169	I=24.2, R=25.6, g=24.9, u=22.3, z=24.0	SDSS
194.2	175.7811	51.0216	I=21.4, R=21.5, g=22.0, u=23.1, z=22.1	SDSS
194.9	175.7167	51.0318	I=22.3, R=24.9, g=24.9, u=25.6, z=23.0	SDSS
195.7	175.7750	51.0247	h=12.1, j=12.7, k=11.8	2MASS
195.8	175.7751	51.0247	I=14.6, R=15.7, g=17.2, u=19.8, z=14.0	SDSS
196.1	175.7750	51.0248	B1=18.0, B2=18.0, I=13.6, R1=15.4, R2=15.8	USNO-B1
196.1	175.6827	51.0239	I=25.4, R=25.6, g=25.2, u=21.9, z=24.2	SDSS
196.1	175.6845	50.9320	I=21.6, R=23.2, g=24.1, u=24.7, z=19.8	SDSS
196.8	175.6600	51.0106	B2=18.6, R2=20.1	USNO-B1
198.5	175.7330	51.0334	I=20.2, R=21.5, g=23.1, u=24.7, z=19.5	SDSS
198.5	175.6578	51.0096	B2=21.8, R2=20.0	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.