Swift Trigger: 821902;

Presumed name: GRB 180404B

BAT	03^h 33^m 32.16^s, -50° 11′ 42.0″
position:	(53.384, -50.195 ± 180″)
XRT	03^h 33^m 34.83^s, -50° 12′ 53.1″
position:	(53.39512, -50.21474 ± 3.8″)
UVOT	03^h 33^m 34.22^s, -50° 12′ 54.0″
position:	(53.3926, -50.2150 ± 0.8″)
Galactic N_HI:	1.09×10⁰ cm^-2
Galactic E(B-V):	0.012 mag

Best RA:	03^h 33^m 34.22^s	= 53.3926 d
Best Dec:	-50° 12′ 54.0″	= -50.2150 d

Gal Lat:	-51.56
Gal Long:	260.95

Sun angle:	65.75°, -2.7 hr East of Sun

¹Sper #1 auto processing.

Galaxies within 3.33 of XRT position

	RA*	Dec*		Catalogue
5.3	53.3971	-50.2140	B=22.2	SSS
19.1	53.3983	-50.2111		NED
41.8	53.4025	-50.2053		NED
50.1	53.3729	-50.2214		NED
61.7	53.3679	-50.2219		NED
65.8	53.4229	-50.2190	B=20.8, R2=18.9, i=18.8	SSS
67.6	53.4192	-50.2072		NED
67.9	53.4183	-50.2058		NED
70.7	53.4225	-50.2189	Mag=20.36	NED
73.0	53.3645	-50.2198	B=20.9, R2=19.4	SSS
80.3	53.4262	-50.2092	Mag=20.36	NED
81.8	53.3755	-50.2337	B=21.9	SSS
84.2	53.4058	-50.2367	Mag=20.36	NED
90.6	53.3646	-50.2328	Mag=20.36	NED
91.1	53.3749	-50.2365	B=21.6	SSS
91.8	53.3723	-50.2356	B=20.6	SSS
93.2	53.4352	-50.2112	B=22.1	SSS
94.4	53.4229	-50.2325	Mag=20.36	NED
96.3	53.3690	-50.2356	B=21.6	SSS
103.7	53.3754	-50.1883	Mag=19.22	NED
105.1	53.3757	-50.1883	B=19.2, R2=18.2, i=17.8	SSS
105.4	53.3492	-50.2242	Mag=19.22	NED
106.0	53.3487	-50.2244	Mag=19.20	NED
107.9	53.3475	-50.2233	Mag=19.20	NED
111.0	53.3494	-50.2244	B=19.1, R2=17.7, i=17.2	SSS
111.6	53.4325	-50.2344	B=19.9, R2=18.4, i=18.6	SSS
111.7	53.4171	-50.1881	Mag=19.20	NED
111.7	53.4350	-50.2300	Mag=19.20	NED
111.8	53.3454	-50.2225	Mag=19.20	NED
114.1	53.4332	-50.2350	B2=22.4, R2=21.0	USNO-B1
114.2	53.3588	-50.1917	Mag=19.20	NED
115.3	53.4321	-50.2344	Mag=19.80	NED
116.2	53.3992	-50.1831	Mag=19.80	NED
117.1	53.3417	-50.2164	Mag=19.0	NED
119.3	53.3521	-50.2358	Mag=20.19	NED
121.4	53.3997	-50.1811	B=21.9, R2=20.7	SSS
122.0	53.3994	-50.1810	B2=22.4, R2=21.5	USNO-B1
123.3	53.3417	-50.2167	B=22.0, R2=19.0, i=18.8	SSS
123.6	53.3416	-50.2166	I=18.6, R1=20.1, R2=19.4	USNO-B1
124.1	53.3524	-50.2358	B=20.2, R2=18.3, i=17.8	SSS
125.4	53.3883	-50.2497	Mag=19.93	NED
125.7	53.3885	-50.2494	B=19.9, R2=18.3, i=17.7	SSS
126.1	53.3412	-50.2272	Mag=19.93	NED
127.2	53.3983	-50.2500	B2=19.0, I=18.4, R1=19.3, R2=19.3	USNO-B1
129.8	53.3362	-50.2181	Mag=19.93	NED
130.1	53.4253	-50.1842	B=21.4, R2=20.2	SSS
132.2	53.3429	-50.1964	Mag=19.93	NED
134.2	53.3512	-50.1889	Mag=19.93	NED
134.6	53.3793	-50.1788	B=20.0, R2=18.4, i=17.9	SSS
135.4	53.4246	-50.1836	Mag=19.93	NED
135.5	53.3779	-50.1786	Mag=19.93	NED
135.7	53.3387	-50.2306	Mag=19.93	NED
138.2	53.4368	-50.2424	B2=22.0, R1=20.7, R2=21.5	USNO-B1
138.7	53.4254	-50.2480	B=22.6	SSS
139.9	53.4363	-50.2419	Mag=19.93	NED
141.2	53.4396	-50.1897	Mag=19.93	NED
142.0	53.3429	-50.1914	Mag=19.93	NED
147.7	53.3408	-50.1906	Mag=19.93	NED
148.6	53.4213	-50.1781	Mag=19.93	NED
151.1	53.3550	-50.2494	Mag=20.19	NED
151.4	53.3533	-50.1814	Mag=20.19	NED
152.1	53.3410	-50.1906	B=21.3, R2=19.6	SSS
153.0	53.3458	-50.1863	B=21.8	SSS
153.2	53.3288	-50.2114	B=21.9, R2=19.9	SSS
154.0	53.4170	-50.1743	B=21.9, R2=19.5	SSS
154.4	53.3557	-50.2494	B=20.3, R2=18.7, i=18.4	SSS
154.7	53.4483	-50.2389	Mag=20.19	NED
155.2	53.3854	-50.1722	Mag=20.19	NED
155.5	53.3250	-50.2125	Mag=19.4	NED
156.5	53.3848	-50.1718	B=20.6, R2=19.2, i=18.5	SSS
156.5	53.3371	-50.2403	Mag=19.4	NED
157.0	53.3992	-50.2583	Mag=19.4	NED
158.8	53.4337	-50.1797	Mag=19.4	NED
158.9	53.4175	-50.1739	Mag=19.4	NED
161.5	53.3650	-50.1736	Mag=19.64	NED
161.9	53.4467	-50.2439	Mag=19.64	NED
162.2	53.4235	-50.2560	B=19.5, R2=18.5, i=18.0	SSS
162.2	53.4380	-50.2505	B=20.5, R2=19.2, i=18.9	SSS
163.2	53.3655	-50.1736	B=19.8, R2=18.3, i=17.5	SSS
164.2	53.4233	-50.2561	Mag=19.47	NED
164.8	53.4379	-50.2503	Mag=19.0	NED
164.9	53.3633	-50.2569	Mag=19.0	NED
165.7	53.3212	-50.2211	Mag=19.0	NED
168.1	53.3737	-50.2600	Mag=19.0	NED
168.4	53.3632	-50.2568	I=18.5, R1=20.8, R2=21.5	USNO-B1
169.0	53.3721	-50.1700	Mag=19.0	NED
173.4	53.3294	-50.1913	B=22.2	SSS
174.5	53.4425	-50.2514	Mag=19.0	NED
174.7	53.4133	-50.1683	Mag=19.0	NED
177.7	53.4539	-50.2467	B=21.8, R2=20.6	SSS
178.9	53.3190	-50.2049	B2=21.8, I=18.6, R1=20.0, R2=20.6	USNO-B1
179.8	53.4405	-50.1741	B=20.7, R2=19.6	SSS
180.1	53.3371	-50.1797	Mag=20.0	NED
180.5	53.4150	-50.2631	Mag=20.0	NED
182.6	53.4076	-50.1646	B2=21.2, R1=20.9, R2=21.4	USNO-B1
184.9	53.4079	-50.1644	Mag=20.0	NED
185.6	53.4417	-50.1742	Mag=20.0	NED
186.0	53.3133	-50.2250	Mag=19.5	NED
189.0	53.4238	-50.2639	B2=21.6, R1=20.8, R2=21.7	USNO-B1
190.0	53.4242	-50.2639	Mag=19.8	NED
191.4	53.3192	-50.1897	Mag=19.5	NED
191.7	53.3134	-50.2249	B=21.6, R2=19.5	SSS
191.8	53.4342	-50.1689	Mag=19.5	NED
192.1	53.4758	-50.2183	Mag=19.5	NED
192.6	53.4488	-50.1756	Mag=19.5	NED
193.3	53.3850	-50.2683	Mag=19.5	NED
193.4	53.4463	-50.1722	B=21.5, R2=19.8, i=18.7	SSS
193.8	53.3087	-50.2114	Mag=19.5	NED
194.8	53.4742	-50.2006	Mag=19.5	NED
195.7	53.3197	-50.1898	B=21.6, R2=19.6	SSS
197.1	53.4806	-50.2116	B2=21.3, R1=20.8, R2=20.9	USNO-B1
197.4	53.4533	-50.1764	Mag=19.5	NED
197.6	53.4462	-50.1722	Mag=19.5	NED
198.5	53.4773	-50.1981	B=20.8, R2=19.0, i=18.8	SSS
198.6	53.4170	-50.2681	B=22.1	SSS
199.4	53.3567	-50.1647	Mag=19.5	NED
199.6	53.4816	-50.2112	I=18.2, R1=20.6	USNO-B1

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