Swift Trigger: 349510;

Presumed name: GRB 090418A

BAT	17^h 57^m 20.16^s, +33° 24′ 32.4″
position:	(269.334, +33.409 ± 180″)
XRT	17^h 57^m 15.10^s, +33° 24′ 19.8″
position:	(269.3129, 33.4055 ± 2.1″)
UVOT	No position available.
Galactic N_HI:	0.00×10⁰ cm^-2
Galactic E(B-V):	0.043 mag

Best RA:	17^h 57^m 15.10^s	= 269.3129 d
Best Dec:	+33° 24′ 19.8″	= 33.4055 d

Gal Lat:
Gal Long:

Sun angle:	not found

Stars within 3.33 of XRT position

	RA*	Dec*		Catalogue
20.4	269.3158	33.4004	B1=20.4, B2=20.7, R2=19.8	USNO-B1
20.6	269.3174	33.4098	h=16.0, j=16.6, k=16.0	2MASS
20.6	269.3172	33.4100	B1=18.6, B2=18.3, I=17.2, R1=17.4, R2=17.2	USNO-B1
20.8	269.3179	33.4015	B1=20.8, B2=19.7, R1=18.9, R2=20.0	USNO-B1
27.1	269.3196	33.4004	B2=20.3, I=18.6, R1=18.3	USNO-B1
31.8	269.3214	33.4002	B2=20.1, I=18.5, R1=19.8, R2=19.4	USNO-B1
31.8	269.3076	33.3978	B2=20.9, I=18.8	USNO-B1
34.7	269.3226	33.4003	B1=20.8, B2=19.5, I=18.0, R1=19.5, R2=19.3	USNO-B1
42.8	269.3101	33.3938	B1=17.3, B2=17.1, I=14.5, R1=15.3, R2=15.2	USNO-B1
43.1	269.3101	33.3938	h=12.5, j=13.2, k=12.3	2MASS
43.1	269.3259	33.4005	B1=20.9, B2=19.3, I=18.1, R2=18.5	USNO-B1
44.9	269.3268	33.4009	B2=19.1, R1=18.6	USNO-B1
46.5	269.3053	33.4168	h=13.9, j=14.3, k=13.8	2MASS
46.7	269.3054	33.4168	B1=16.6, B2=16.6, I=15.2, R1=15.5, R2=15.3	USNO-B1
54.0	269.3195	33.3915	B1=20.8, B2=20.6, I=17.3, R1=18.8, R2=18.9	USNO-B1
54.2	269.3194	33.3915	h=15.1, j=15.7, k=14.9	2MASS
54.2	269.3236	33.3934	B1=17.3, B2=16.9, I=15.7, R1=16.0, R2=16.0	USNO-B1
54.4	269.3236	33.3933	h=14.5, j=15.0, k=14.4	2MASS
54.6	269.3300	33.4004	B1=20.4, B2=18.6, I=17.2, R2=18.9	USNO-B1
55.0	269.3304	33.4010	I=17.9, R1=18.2	USNO-B1
56.9	269.3105	33.3898	B1=20.8, B2=20.8, I=17.1, R1=19.1, R2=19.2	USNO-B1
57.3	269.3105	33.3897	h=14.8, j=15.5, k=14.6	2MASS
58.1	269.2948	33.4113	B2=20.6, I=18.8, R1=19.2, R2=20.3	USNO-B1
58.8	269.3316	33.4006	B1=20.4, B2=18.6, I=17.7, R2=17.4	USNO-B1
60.5	269.3103	33.4222	h=16.1, j=17.0, k=15.8	2MASS
69.9	269.3122	33.4249	h=14.6, j=15.4, k=14.3	2MASS
71.0	269.2898	33.4095	h=15.8, j=16.7, k=15.9	2MASS
71.3	269.3004	33.4223	h=14.9, j=15.4, k=14.7	2MASS
71.3	269.3004	33.4224	B1=21.0, B2=20.8, I=16.7, R1=18.6, R2=18.5	USNO-B1
71.5	269.2896	33.4096	B1=20.3, B2=20.2, I=17.7, R1=18.5, R2=19.0	USNO-B1
71.6	269.2891	33.4051	B1=20.9, B2=20.6, R1=19.9, R2=19.6	USNO-B1
72.4	269.3206	33.4245	B1=20.8, B2=20.8, I=18.5, R1=19.3, R2=19.2	USNO-B1
72.5	269.3043	33.3867	B1=21.0, B2=20.6, I=17.4, R1=18.4, R2=19.0	USNO-B1
72.7	269.3043	33.3866	h=15.3, j=16.0, k=15.1	2MASS
74.3	269.2920	33.4165	h=15.1, j=15.6, k=15.0	2MASS
74.5	269.2920	33.4166	B1=17.9, B2=17.9, I=16.4, R1=16.6, R2=16.7	USNO-B1
78.9	269.2903	33.4167	B1=20.8, B2=20.6, I=17.4, R2=19.5	USNO-B1
85.5	269.3362	33.3918	h=16.1, j=17.0, k=15.9	2MASS
87.3	269.2844	33.4006	B1=20.5, B2=20.4, I=18.5, R1=19.3, R2=19.2	USNO-B1
91.8	269.3363	33.4219	h=13.3, j=13.6, k=13.2	2MASS
92.0	269.3363	33.4219	B1=15.3, B2=14.9, I=14.5, R1=14.5, R2=14.3	USNO-B1
93.8	269.3161	33.3796	h=15.8, j=16.1, k=15.5	2MASS
93.9	269.2931	33.3853	B1=20.4, B2=20.5, I=18.5, R2=19.5	USNO-B1
94.1	269.3162	33.3795	B1=18.5, B2=18.4, I=17.0, R1=17.4, R2=17.2	USNO-B1
95.6	269.2899	33.3872	B1=20.8, B2=20.9	USNO-B1
102.0	269.3400	33.4225	B1=20.2, B2=20.4	USNO-B1
104.6	269.3096	33.4344	B1=20.8, B2=20.7	USNO-B1
106.9	269.3240	33.3773	B1=18.7, B2=18.8, I=17.8, R1=17.9, R2=17.8	USNO-B1
107.5	269.2780	33.3990	B2=20.6, I=18.1, R1=18.8, R2=19.0	USNO-B1
110.5	269.2896	33.3817	B1=18.1, B2=18.1, I=16.7, R1=17.0, R2=16.9	USNO-B1
110.8	269.2896	33.3817	h=15.2, j=15.9, k=15.3	2MASS
112.9	269.2996	33.3762	B1=20.3, B2=20.6, I=16.2, R1=18.6, R2=18.6	USNO-B1
113.0	269.2753	33.4065	B1=20.2, B2=20.3, I=18.7, R1=19.4, R2=19.8	USNO-B1
113.3	269.2995	33.3761	h=14.1, j=14.8, k=13.8	2MASS
113.9	269.2768	33.4151	I=18.7, R1=19.7, R2=19.8	USNO-B1
116.1	269.3391	33.3818	B1=20.5, B2=20.8, I=18.4, R1=19.2, R2=19.9	USNO-B1
116.5	269.3401	33.4286	h=14.0, j=14.7, k=13.9	2MASS
116.5	269.3513	33.4008	h=4.8, j=5.3, k=4.8	2MASS
116.6	269.3401	33.4286	B1=18.2, B2=17.9, I=15.7, R1=16.2, R2=16.1	USNO-B1
120.5	269.3189	33.4386	B1=20.6, B2=20.7, R2=20.0	USNO-B1
121.7	269.2724	33.4068	B1=20.6, B2=20.8, I=17.7, R1=18.7, R2=18.9	USNO-B1
122.0	269.2723	33.4067	h=15.7, j=16.3, k=15.3	2MASS
123.7	269.2728	33.4133	h=15.0, j=15.8, k=14.9	2MASS
123.8	269.2728	33.4133	B1=19.9, B2=19.2, I=16.9, R1=17.4, R2=17.6	USNO-B1
127.1	269.3326	33.4367	B1=20.9, B2=19.9, I=17.5, R1=18.6, R2=18.1	USNO-B1
127.3	269.3030	33.3711	B1=17.2, B2=17.2, I=15.9, R1=16.4, R2=16.3	USNO-B1
127.5	269.3030	33.3711	h=15.1, j=15.4, k=14.8	2MASS
128.8	269.3510	33.4218	B2=19.6, I=17.7, R1=19.1	USNO-B1
129.2	269.3318	33.4377	B1=20.9, B2=20.8, R1=19.8, R2=19.1	USNO-B1
129.4	269.3432	33.4310	h=13.4, j=13.9, k=13.4	2MASS
129.5	269.3432	33.4310	B1=15.8, B2=15.6, I=14.8, R1=14.9, R2=14.8	USNO-B1
130.6	269.3501	33.4242	B2=19.3, I=18.2, R1=19.9	USNO-B1
131.5	269.3512	33.4232	R1=18.7, R2=18.6	USNO-B1
131.6	269.2926	33.3731	B1=15.9, B2=15.8, I=14.8, R1=14.9, R2=14.9	USNO-B1
132.0	269.2926	33.3730	h=13.5, j=13.9, k=13.5	2MASS
133.2	269.2713	33.4182	B2=20.7, R2=20.1	USNO-B1
134.3	269.3569	33.4120	h=13.9, j=14.2, k=13.8	2MASS
135.5	269.3292	33.4406	B1=20.8, B2=20.6, I=18.3, R1=19.3, R2=19.4	USNO-B1
137.2	269.2676	33.4011	h=15.7, j=16.2, k=14.2	2MASS
137.8	269.3587	33.4062	h=16.1, j=16.7, k=16.6	2MASS
138.1	269.2953	33.3701	B2=20.9, I=18.9, R1=19.9, R2=19.9	USNO-B1
138.1	269.2672	33.4015	h=15.3, j=15.0, k=15.2	2MASS
138.4	269.2727	33.3867	B2=20.7, R2=19.7	USNO-B1
138.6	269.3152	33.4439	h=15.2, j=15.7, k=15.2	2MASS
138.9	269.3153	33.4440	B1=17.9, B2=18.0, I=16.6, R1=16.9, R2=16.8	USNO-B1
139.1	269.3369	33.3725	h=15.1, j=15.4, k=14.7	2MASS
139.1	269.3369	33.3725	B1=16.1, B2=16.6, I=15.8, R1=16.2, R2=15.8	USNO-B1
139.4	269.2667	33.4019	h=15.0, j=15.9, k=14.4	2MASS
139.7	269.2731	33.3855	B1=20.8, B2=20.6, I=17.9, R1=19.6, R2=19.9	USNO-B1
139.8	269.2732	33.3853	h=15.6, j=16.2, k=15.3	2MASS
141.3	269.2894	33.3715	B1=19.4, B2=19.3, I=17.9, R1=17.9, R2=18.0	USNO-B1
142.6	269.3531	33.3845	h=15.2, j=15.9, k=15.0	2MASS
142.7	269.3417	33.4370	B1=20.8, B2=20.9, I=18.3, R1=19.3, R2=19.3	USNO-B1
143.8	269.2653	33.4019	h=15.7, j=15.4, k=15.6	2MASS
147.2	269.2686	33.4229	h=16.4, j=16.8, k=16.2	2MASS
148.1	269.2683	33.4230	B1=20.9, B2=20.8, I=18.3, R1=19.1, R2=19.2	USNO-B1
148.3	269.2978	33.3663	B2=20.9, I=18.7, R1=19.7, R2=19.8	USNO-B1
149.0	269.2775	33.4345	B2=20.9, R1=19.6, R2=20.4	USNO-B1
149.6	269.3537	33.3817	h=11.4, j=11.7, k=11.3	2MASS
149.9	269.3515	33.4319	B2=20.5, R1=19.5	USNO-B1
151.2	269.3035	33.3642	B1=21.0, B2=20.8, I=18.6, R1=19.3	USNO-B1
151.9	269.3180	33.4475	B1=20.4, R1=19.9	USNO-B1
152.3	269.2817	33.3722	B1=20.0, B2=20.0, I=17.4, R1=18.3, R2=18.1	USNO-B1
152.5	269.2630	33.3977	B1=20.9, B2=20.7, I=18.6, R1=19.9, R2=19.5	USNO-B1
152.5	269.2816	33.3721	h=15.5, j=16.2, k=15.8	2MASS
153.1	269.3520	33.3782	B2=20.4, I=18.4, R1=19.6, R2=19.1	USNO-B1
154.2	269.2995	33.4468	h=12.2, j=12.5, k=12.1	2MASS
154.3	269.2996	33.4469	B1=14.3, B2=14.2, I=13.5, R1=13.8, R2=13.5	USNO-B1
155.1	269.2703	33.4298	h=16.0, j=16.5, k=15.8	2MASS
155.1	269.2703	33.4298	B1=18.0, B2=18.2, I=17.2, R1=17.1, R2=17.3	USNO-B1
157.8	269.3638	33.3949	h=15.3, j=16.0, k=15.2	2MASS
158.6	269.3518	33.3758	B1=20.9, B2=19.8, I=18.5, R1=19.4, R2=19.2	USNO-B1
161.6	269.3667	33.4041	h=14.4, j=14.9, k=14.3	2MASS
162.9	269.3505	33.4381	B2=20.1, R2=18.7	USNO-B1
163.3	269.2589	33.4005	B1=20.2, B2=20.6, R1=19.5, R2=19.8	USNO-B1
163.7	269.3074	33.3603	h=14.3, j=14.8, k=14.2	2MASS
163.8	269.3518	33.3736	B2=20.2, R2=20.3	USNO-B1
164.2	269.3422	33.4440	B2=20.9, R1=19.4, R2=19.6	USNO-B1
165.9	269.3641	33.3883	h=15.5, j=15.6, k=14.9	2MASS
167.4	269.3414	33.3656	B2=19.4, I=16.0, R1=17.6, R2=17.4	USNO-B1
167.6	269.3415	33.3655	h=14.1, j=14.7, k=13.8	2MASS
168.0	269.3463	33.4429	h=16.0, j=16.7, k=15.5	2MASS
168.1	269.2738	33.4389	B2=20.7, I=18.8, R1=19.2, R2=20.3	USNO-B1
168.1	269.3462	33.4431	I=18.3, R1=19.7, R2=19.4	USNO-B1
168.2	269.3258	33.4510	B1=20.7, B2=20.8, I=18.4, R1=19.5, R2=19.3	USNO-B1
168.3	269.3647	33.3877	B1=17.6, B2=16.8, R1=16.2, R2=16.1	USNO-B1
168.8	269.3648	33.3876	h=15.3, j=15.5, k=14.7	2MASS
168.9	269.2731	33.4387	B2=20.9, R1=19.4	USNO-B1
170.9	269.3519	33.3710	I=19.0, R2=20.1	USNO-B1
172.3	269.3702	33.4045	h=13.2, j=13.4, k=13.1	2MASS
172.6	269.3306	33.4511	B1=19.8, B2=19.7, I=18.1, R1=18.7, R2=18.5	USNO-B1
172.9	269.3704	33.4044	B1=14.4, B2=14.1, I=13.3, R1=13.7, R2=13.7	USNO-B1
173.3	269.3703	33.4011	B2=17.8, R1=18.3	USNO-B1
174.7	269.2549	33.4023	B2=20.7, R2=20.4	USNO-B1
175.0	269.2603	33.4263	B1=20.1, B2=20.2, I=18.6, R1=19.0, R2=19.3	USNO-B1
175.2	269.2811	33.4463	B2=20.9, I=18.8, R1=18.8, R2=20.0	USNO-B1
175.5	269.3713	33.4045	h=13.3, j=14.6, k=13.2	2MASS
176.3	269.3713	33.4009	B1=19.5, R2=17.5	USNO-B1
177.8	269.2816	33.3636	B2=20.9, R1=19.9, R2=19.6	USNO-B1
179.9	269.3012	33.4545	h=10.6, j=11.1, k=10.5	2MASS
179.9	269.3727	33.4074	I=17.6, R1=19.7, R2=17.0	USNO-B1
180.1	269.3728	33.4074	h=14.9, j=15.7, k=14.7	2MASS
180.1	269.3013	33.4546	B1=14.1, B2=13.7, I=11.4, R1=12.9, R2=12.7	USNO-B1
180.9	269.2675	33.4385	h=14.8, j=15.1, k=14.6	2MASS
181.1	269.2675	33.4386	B1=16.7, B2=17.2, I=15.8, R1=16.1, R2=16.1	USNO-B1
181.3	269.3730	33.4012	B1=18.0, I=17.4, R2=15.8	USNO-B1
182.9	269.3736	33.4013	B2=15.5, I=17.5, R1=19.0, R2=16.1	USNO-B1
183.2	269.2581	33.4278	B2=20.8, I=18.6, R1=19.7, R2=20.0	USNO-B1
184.7	269.2778	33.3634	h=14.1, j=14.8, k=14.0	2MASS
185.2	269.2779	33.3632	B1=18.2, B2=17.8, I=15.3, R1=16.0, R2=16.0	USNO-B1
185.2	269.2847	33.4512	B1=20.7, B2=19.4, R1=19.7	USNO-B1
185.8	269.3745	33.4012	B2=18.9, I=17.3, R1=17.8, R2=18.3	USNO-B1
185.9	269.2514	33.4000	h=16.1, j=16.1, k=15.6	2MASS
187.5	269.3472	33.4490	h=16.1, j=16.6, k=15.6	2MASS
187.5	269.3472	33.4490	B1=20.8, B2=20.4, I=17.7, R1=18.8, R2=18.8	USNO-B1
189.5	269.3684	33.4305	h=16.2, j=16.1, k=15.7	2MASS
189.7	269.3685	33.4305	B1=18.5, B2=18.2, I=16.7, R1=17.1, R2=17.0	USNO-B1
191.1	269.2587	33.4333	B1=21.0, B2=20.9, I=18.2, R1=19.3, R2=19.6	USNO-B1
192.8	269.3756	33.4167	h=16.1, j=16.5, k=16.4	2MASS
193.8	269.2487	33.4109	h=15.4, j=16.2, k=15.2	2MASS
194.4	269.2699	33.4458	R1=19.6, R2=20.3	USNO-B1
194.6	269.3652	33.3736	B1=20.8, B2=20.8, R1=19.2, R2=20.0	USNO-B1
195.5	269.3423	33.4539	h=15.7, j=16.2, k=15.1	2MASS
195.6	269.3424	33.4539	B1=18.9, B2=17.5, I=16.6, R1=17.5, R2=16.5	USNO-B1
196.5	269.3213	33.3514	h=10.3, j=10.9, k=10.2	2MASS
196.7	269.3601	33.3676	B1=18.6, B2=18.5, I=17.6, R1=18.0, R2=17.9	USNO-B1
197.0	269.3763	33.3916	B1=14.1, B2=13.5, I=13.4, R1=13.4, R2=13.3	USNO-B1
197.0	269.3763	33.3916	h=11.9, j=12.2, k=11.9	2MASS
199.3	269.3755	33.3873	I=18.9, R2=20.4	USNO-B1
199.9	269.2464	33.4066	B1=20.6, B2=20.5, R1=19.6, R2=19.8	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.