Swift Trigger: 965484;

Presumed name: GRB 200409A

BAT	04^h 02^m 12.72^s, -50° 14′ 49.2″
position:	(60.553, -50.247 ± 180″)
XRT	04^h 02^m 08.78^s, -50° 13′ 29.6″
position:	(60.5366, -50.2249 ± 2.2″)
UVOT	04^h 02^m 08.74^s, -50° 13′ 28.2″
position:	(60.5364, -50.2245 ± 0.8″)
Galactic N_HI:	1.24×10⁰ cm^-2
Galactic E(B-V):	0.010 mag

Best RA:	04^h 02^m 08.74^s	= 60.5364 d
Best Dec:	-50° 13′ 28.2″	= -50.2245 d

Gal Lat:	-47.21
Gal Long:	258.8

Sun angle:	68.61°, -2.8 hr East of Sun

¹Sper #3 auto processing.

Galaxies within 3.33 of XRT position

	RA*	Dec*		Catalogue
8.9	60.5400	-50.2253		NED
25.0	60.5271	-50.2208	Mag=19.7	NED
25.1	60.5400	-50.2178	Mag=19.7	NED
25.5	60.5437	-50.2297	Mag=19.7	NED
28.7	60.5237	-50.2239	Mag=19.7	NED
31.4	60.5500	-50.2256	Mag=19.7	NED
31.7	60.5263	-50.2306	Mag=19.7	NED
34.7	60.5342	-50.2150	Mag=19.7	NED
36.2	60.5208	-50.2244	Mag=19.7	NED
40.3	60.5496	-50.2172	Mag=19.7	NED
42.2	60.5367	-50.2361	Mag=19.7	NED
44.3	60.5233	-50.2336	Mag=19.7	NED
44.7	60.5175	-50.2278	Mag=19.7	NED
49.9	60.5154	-50.2208	Mag=19.7	NED
49.9	60.5408	-50.2113	B=22.9	SSS
52.7	60.5263	-50.2375	Mag=19.7	NED
53.6	60.5471	-50.2114	Mag=19.7	NED
54.4	60.5600	-50.2258	Mag=19.7	NED
55.1	60.5168	-50.2163	B2=20.9, I=18.6	USNO-B1
55.9	60.5154	-50.2164	Mag=19.7	NED
57.0	60.5154	-50.2331	B=22.3, R2=20.6	SSS
58.5	60.5150	-50.2333	Mag=19.7	NED
61.2	60.5629	-50.2231	Mag=19.7	NED
61.5	60.5192	-50.2378	B=21.6, R2=20.2	SSS
61.6	60.5196	-50.2378	Mag=19.7	NED
62.2	60.5187	-50.2378	B2=22.2, R1=20.6, R2=20.8	USNO-B1
63.4	60.5092	-50.2222	Mag=19.7	NED
65.2	60.5142	-50.2133	Mag=19.7	NED
65.9	60.5192	-50.2097	Mag=19.7	NED
66.5	60.5287	-50.2422	Mag=19.7	NED
67.1	60.5525	-50.2089	Mag=19.7	NED
67.7	60.5526	-50.2091	B=21.7, R2=20.3	SSS
67.7	60.5558	-50.2106	Mag=19.7	NED
68.5	60.5067	-50.2267	Mag=19.7	NED
71.5	60.5671	-50.2278	Mag=19.7	NED
72.2	60.5079	-50.2331	Mag=19.7	NED
75.2	60.5304	-50.2039	Mag=19.7	NED
78.6	60.5133	-50.2406	Mag=19.7	NED
82.2	60.5579	-50.2064	Mag=19.7	NED
82.7	60.5454	-50.2467	Mag=19.7	NED
82.9	60.5004	-50.2258	Mag=19.7	NED
83.1	60.5005	-50.2258	B2=21.3, I=17.6, R1=19.6, R2=19.5	USNO-B1
85.9	60.5504	-50.2467	Mag=19.7	NED
88.1	60.5079	-50.2408	Mag=19.7	NED
88.7	60.5254	-50.2481	Mag=19.7	NED
89.5	60.5604	-50.2442	Mag=19.7	NED
89.8	60.5296	-50.2000	Mag=19.7	NED
91.2	60.5317	-50.2497	Mag=19.7	NED
91.6	60.5719	-50.2132	B=21.6, R2=21.0	SSS
91.7	60.5298	-50.1998	B=18.7, R2=16.7, i=16.5	SSS
91.7	60.5171	-50.2469	Mag=19.7	NED
94.9	60.5717	-50.2108	Mag=19.7	NED
95.2	60.5092	-50.2444	Mag=19.7	NED
95.3	60.5412	-50.1983	Mag=19.7	NED
95.9	60.5667	-50.2428	Mag=19.7	NED
96.5	60.5004	-50.2108	Mag=19.7	NED
98.4	60.5050	-50.2061	Mag=19.7	NED
99.9	60.4959	-50.2345	B=21.0, R2=19.7	SSS
100.0	60.4958	-50.2342	Mag=19.7	NED
100.5	60.5731	-50.2096	I=18.7, R2=20.9	USNO-B1
102.3	60.4958	-50.2364	Mag=19.7	NED
103.7	60.5442	-50.2528	Mag=19.7	NED
105.7	60.5121	-50.1994	Mag=19.7	NED
105.8	60.4921	-50.2167	Mag=19.7	NED
106.3	60.5525	-50.1969	Mag=19.7	NED
106.8	60.4900	-50.2244	Mag=19.7	NED
106.9	60.5192	-50.2522	Mag=19.7	NED
109.0	60.4921	-50.2133	Mag=19.7	NED
109.2	60.5371	-50.2547	Mag=19.7	NED
109.5	60.5371	-50.2550	Mag=19.7	NED
110.1	60.4998	-50.2054	B=22.5	SSS
111.8	60.4896	-50.2331	Mag=19.7	NED
112.9	60.5783	-50.2083	Mag=19.7	NED
113.1	60.5187	-50.1953	Mag=19.7	NED
113.3	60.5854	-50.2275	Mag=19.7	NED
113.4	60.5488	-50.2550	Mag=19.7	NED
113.6	60.5829	-50.2139	Mag=19.7	NED
114.0	60.5688	-50.2486	Mag=19.7	NED
115.3	60.5342	-50.1925	Mag=19.7	NED
115.6	60.5596	-50.1961	Mag=19.7	NED
116.3	60.4908	-50.2383	Mag=19.7	NED
116.9	60.5233	-50.1931	Mag=19.7	NED
119.0	60.5771	-50.2042	Mag=19.7	NED
120.3	60.5008	-50.2000	Mag=19.7	NED
120.3	60.5829	-50.2097	Mag=19.7	NED
121.4	60.4896	-50.2092	Mag=19.7	NED
122.6	60.5229	-50.2575	Mag=19.7	NED
123.7	60.5850	-50.2389	Mag=19.7	NED
126.2	60.5153	-50.2572	B=22.1, R2=20.8	SSS
126.6	60.5392	-50.1894	Mag=19.7	NED
126.9	60.5588	-50.1922	Mag=19.7	NED
127.2	60.5742	-50.1986	Mag=19.7	NED
127.3	60.5833	-50.2058	Mag=19.7	NED
128.5	60.5150	-50.2575	Mag=19.7	NED
128.9	60.4808	-50.2192	Mag=19.7	NED
129.4	60.4867	-50.2414	Mag=19.7	NED
130.2	60.4913	-50.2028	Mag=19.7	NED
130.6	60.5033	-50.1950	Mag=19.7	NED
130.6	60.4954	-50.1994	Mag=19.7	NED
133.7	60.4790	-50.2295	B=21.1, R2=19.6	SSS
133.9	60.5621	-50.2578	Mag=19.7	NED
134.2	60.5204	-50.1886	Mag=19.7	NED
135.1	60.4783	-50.2297	Mag=19.7	NED
135.7	60.4842	-50.2069	Mag=19.7	NED
136.0	60.4975	-50.2532	B=19.3, R2=18.2, i=17.2	SSS
136.2	60.5646	-50.1914	Mag=19.7	NED
137.5	60.4813	-50.2392	Mag=19.7	NED
137.7	60.4967	-50.2531	Mag=19.48	NED
137.9	60.5952	-50.2326	B=20.7, R2=18.5, i=17.6	SSS
137.9	60.5800	-50.1983	Mag=19.48	NED
138.1	60.4887	-50.2478	Mag=19.48	NED
138.4	60.5950	-50.2325	Mag=19.48	NED
139.4	60.5500	-50.2622	Mag=19.48	NED
139.9	60.4992	-50.1939	Mag=19.48	NED
140.6	60.4996	-50.1939	B=20.7, R2=19.8	SSS
140.8	60.5559	-50.2620	B=19.5, R2=18.8, i=17.7	SSS
141.1	60.5887	-50.2447	Mag=19.48	NED
141.3	60.5554	-50.2619	Mag=19.61	NED
141.4	60.5167	-50.1872	Mag=19.61	NED
141.4	60.5929	-50.2092	Mag=19.61	NED
144.1	60.5908	-50.2047	Mag=19.61	NED
144.2	60.4932	-50.2538	B2=19.4, I=16.1, R1=17.6, R2=17.9	USNO-B1
144.7	60.4933	-50.2536	Mag=19.61	NED
146.1	60.5705	-50.2592	R1=20.8, R2=20.9	USNO-B1
146.3	60.5850	-50.2506	Mag=19.61	NED
148.0	60.5708	-50.2592	Mag=19.61	NED
148.1	60.4821	-50.2025	Mag=19.61	NED
148.3	60.6008	-50.2267	Mag=19.61	NED
148.4	60.4767	-50.2089	Mag=19.61	NED
148.9	60.4729	-50.2328	Mag=19.61	NED
149.5	60.5800	-50.2553	Mag=19.61	NED
149.6	60.5525	-50.2647	Mag=19.61	NED
150.1	60.5054	-50.1878	Mag=19.5	NED
150.2	60.4838	-50.2492	Mag=19.5	NED
150.8	60.6017	-50.2202	B=21.9, R2=20.6	SSS
151.4	60.6017	-50.2200	Mag=19.5	NED
151.9	60.5425	-50.1825	Mag=19.5	NED
152.3	60.5054	-50.2619	Mag=19.5	NED
153.4	60.5271	-50.1822	Mag=19.5	NED
154.9	60.5825	-50.1933	Mag=19.5	NED
155.5	60.5575	-50.1836	Mag=19.5	NED
156.5	60.5172	-50.2666	B2=20.9, R1=20.9, R2=20.7	USNO-B1
156.5	60.5800	-50.1914	Mag=19.5	NED
157.4	60.5801	-50.1912	B2=22.3, I=18.4, R1=20.3, R2=20.0	USNO-B1
157.5	60.5729	-50.2614	Mag=19.5	NED
157.8	60.4917	-50.1914	Mag=19.5	NED
158.0	60.4683	-50.2181	Mag=19.5	NED
158.5	60.6050	-50.2231	Mag=19.5	NED
158.9	60.4962	-50.1886	Mag=19.5	NED
159.7	60.5554	-50.2672	Mag=19.5	NED
160.0	60.4838	-50.1956	Mag=19.5	NED
160.1	60.6021	-50.2103	Mag=19.5	NED
160.9	60.5892	-50.2539	Mag=19.5	NED
161.2	60.4717	-50.2417	Mag=19.5	NED
162.1	60.4992	-50.2628	Mag=19.5	NED
162.8	60.5833	-50.2588	B=19.0, R2=17.7, i=16.8	SSS
162.8	60.6013	-50.2069	Mag=19.5	NED
162.8	60.5771	-50.1875	Mag=19.5	NED
163.2	60.5229	-50.1800	Mag=19.5	NED
163.3	60.5829	-50.2589	Mag=19.25	NED
163.3	60.5517	-50.1803	Mag=19.25	NED
164.3	60.5333	-50.1789	Mag=19.25	NED
164.7	60.4746	-50.2478	Mag=19.25	NED
164.7	60.5992	-50.2025	Mag=19.25	NED
165.6	60.6050	-50.2114	Mag=19.25	NED
165.7	60.5496	-50.2697	Mag=19.25	NED
168.3	60.5850	-50.1897	Mag=19.25	NED
168.7	60.5035	-50.2667	B2=22.8, R1=20.9, R2=20.5	USNO-B1
168.9	60.5925	-50.1942	Mag=19.25	NED
169.4	60.6083	-50.2147	Mag=19.25	NED
169.7	60.5038	-50.2667	Mag=19.8	NED
170.2	60.4629	-50.2297	Mag=19.8	NED
171.0	60.4713	-50.2014	Mag=19.8	NED
171.2	60.4679	-50.2058	Mag=19.4	NED
171.2	60.4913	-50.2622	Mag=19.4	NED
171.8	60.5292	-50.2719	Mag=19.4	NED
172.1	60.5463	-50.1772	Mag=19.4	NED
172.2	60.4715	-50.2014	B=19.4, R2=18.2, i=18.2	SSS
172.8	60.4625	-50.2328	Mag=19.4	NED
173.0	60.4676	-50.2059	B=21.7, R2=19.3, i=18.8	SSS
173.5	60.5654	-50.2689	Mag=19.4	NED
173.6	60.5921	-50.2569	Mag=19.4	NED
174.0	60.5696	-50.1811	Mag=19.4	NED
174.1	60.6119	-50.2287	B=22.6, R2=21.0	SSS
174.2	60.4842	-50.1894	Mag=19.4	NED
174.3	60.6092	-50.2375	Mag=19.4	NED
174.5	60.4683	-50.2031	Mag=19.4	NED
175.4	60.4733	-50.2519	Mag=19.4	NED
175.4	60.4684	-50.2032	B=21.3, R2=20.4	SSS
176.2	60.5375	-50.2733	Mag=19.4	NED
177.0	60.5900	-50.2594	Mag=19.4	NED
177.1	60.5633	-50.1783	Mag=19.4	NED
178.0	60.5837	-50.1853	Mag=19.4	NED
178.3	60.6125	-50.2339	Mag=19.4	NED
179.0	60.6046	-50.2481	Mag=19.4	NED
179.0	60.4838	-50.2611	Mag=19.4	NED
179.0	60.5804	-50.2656	Mag=19.4	NED
179.6	60.5937	-50.2589	B=22.2	SSS
179.8	60.5525	-50.2733	Mag=19.4	NED
179.9	60.4596	-50.2153	Mag=19.4	NED
181.8	60.6150	-50.2292	Mag=19.4	NED
182.0	60.5412	-50.1742	Mag=19.4	NED
182.3	60.4575	-50.2200	Mag=19.4	NED
182.5	60.6046	-50.2506	Mag=19.4	NED
183.2	60.5321	-50.2757	B=21.5, R2=19.5	SSS
183.3	60.4604	-50.2397	Mag=19.4	NED
183.5	60.6108	-50.2428	Mag=19.4	NED
183.5	60.4567	-50.2269	Mag=19.4	NED
183.8	60.5312	-50.1736	Mag=19.4	NED
183.9	60.4875	-50.2650	Mag=19.4	NED
184.3	60.6129	-50.2097	Mag=19.4	NED
184.4	60.5321	-50.2756	Mag=19.5	NED
186.0	60.6092	-50.2022	Mag=19.5	NED
186.5	60.4737	-50.1917	Mag=19.5	NED
186.6	60.5221	-50.1733	Mag=19.5	NED
187.4	60.5754	-50.2703	Mag=19.5	NED
188.5	60.6067	-50.1978	Mag=20.45	NED
188.5	60.4825	-50.1853	Mag=20.45	NED
188.6	60.6050	-50.2531	Mag=20.45	NED
188.8	60.4958	-50.2700	Mag=20.45	NED
189.1	60.4896	-50.1814	Mag=20.45	NED
189.9	60.6071	-50.1976	B=20.5, R2=18.5, i=17.7	SSS
192.7	60.4642	-50.1975	Mag=20.45	NED
192.8	60.5746	-50.1769	Mag=20.45	NED
192.8	60.5800	-50.1789	Mag=20.45	NED
193.1	60.5171	-50.1722	Mag=20.45	NED
194.0	60.4787	-50.1853	Mag=20.45	NED
194.6	60.4639	-50.1974	B=22.5, R2=20.4	SSS
194.6	60.4713	-50.2589	Mag=20.45	NED
195.2	60.4637	-50.1972	I=18.7, R2=20.8	USNO-B1
195.5	60.4583	-50.2028	Mag=20.45	NED
196.0	60.4667	-50.1931	Mag=20.45	NED
196.4	60.4542	-50.2386	Mag=20.45	NED
197.2	60.6204	-50.2347	Mag=20.45	NED
197.5	60.4904	-50.2708	Mag=20.45	NED
197.5	60.6175	-50.2419	Mag=20.45	NED
198.5	60.5096	-50.2769	Mag=20.45	NED

Queried APM-N, SDSS, PSCz, SSS, NED, 2MASSX, USNO-B1.

* 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