Swift Trigger: 1101053;

Presumed name: GRB 220403B

BAT	12^h 44^m 06.00^s, +89° 10′ 12.0″
position:	(191.025, +89.170 ± 180″)
XRT	12^h 46^m 00.88^s, +89° 11′ 01.9″
position:	(191.50366, 89.18387 ± 3.6″)
UVOT	12^h 45^m 53.28^s, +89° 11′ 06.4″
position:	(191.4720, +89.1851 ± 0.7″)
Galactic N_HI:	6.62×10²⁰ cm^-2
Galactic E(B-V):	0.236 mag

Best RA:	12^h 45^m 53.28^s	= 191.4720 d
Best Dec:	+89° 11′ 06.4″	= +89.1851 d

Gal Lat:	27.94
Gal Long:	122.95

Sun angle:	85.40°, -11.8 hr East of Sun

Galaxies within 200 of XRT position

	RA*	Dec*		Catalogue
17.2	191.7263	89.1883		NED
28.2	191.4858	89.1772		NED
37.4	191.2779	89.1750		NED
38.1	191.5125	89.1744		NED
38.5	192.1075	89.1908		NED
40.4	192.1540	89.1776	B=21.3, R=19.1	APM-N
40.6	192.1498	89.1774	B=21.5, R=18.8	APM-N
40.8	191.0467	89.1756		NED
41.7	190.9608	89.1942		NED
44.9	192.1542	89.1772		NED
45.1	190.6000	89.1836		NED
46.2	192.3462	89.1819		NED
48.0	192.4033	89.1802	B=21.6, R=19.9	APM-N
50.3	190.5096	89.1881		NED
52.7	190.5829	89.1778		NED
55.3	192.1942	89.1967		NED
58.3	191.0829	89.1700		NED
58.4	191.0296	89.2000		NED
58.5	191.6917	89.2011		NED
59.2	190.8424	89.1705	B1=20.9, I=18.6	USNO-B1
59.5	192.5675	89.1797		NED
60.1	190.8211	89.1703	B1=20.7, I=18.4	USNO-B1
60.8	192.3500	89.1739		NED
61.0	191.7304	89.1686		NED
61.8	190.7050	89.1711	B1=19.6, I=18.1	USNO-B1
65.3	192.7383	89.1885	B=21.6, R=18.2	APM-N
66.7	190.4558	89.1969		NED
68.2	192.7021	89.1925		NED
69.2	192.5729	89.1964		NED
69.4	191.4383	89.2044		NED
71.2	190.0863	89.1869		NED
71.8	190.3392	89.1736		NED
74.3	190.0783	89.1911		NED
74.8	191.7367	89.1647		NED
75.5	189.9983	89.1844		NED
76.7	191.5263	89.1639		NED
78.3	192.2292	89.2042		NED
79.3	192.7192	89.1722		NED
79.5	190.2971	89.1708		NED
80.9	192.4838	89.1681		NED
81.0	192.5500	89.2017		NED
81.2	190.5072	89.1664	B1=15.7, B2=15.8, I=14.1, R1=13.8, R2=15.0	USNO-B1
83.6	190.5079	89.1664		NED
85.1	192.9312	89.1967		NED
88.9	189.8150	89.1781		NED
89.5	191.1342	89.1608		NED
89.6	192.1847	89.1610	B1=21.0, I=18.8	USNO-B1
93.2	191.2250	89.2108		NED
93.4	189.7679	89.1947		NED
93.5	192.6987	89.2044		NED
96.5	191.1718	89.2103	I=18.8, R1=18.9	USNO-B1
97.3	193.2830	89.1937	B=21.1, R=17.8	APM-N
97.9	193.2971	89.1936		NED
98.1	193.3000	89.1937	h=14.7, j=0.0, k=14.3	2MASS
98.3	191.2253	89.2109	B=20.4, R=17.3	APM-N
98.3	192.6279	89.1633		NED
98.4	189.5517	89.1869		NED
98.5	190.6887	89.1603		NED
99.1	190.3713	89.2078		NED
100.3	193.4236	89.1897	B1=20.8, B2=20.5, I=18.2, R1=18.8, R2=18.8	USNO-B1
100.6	193.4158	89.1897		NED
101.4	190.3139	89.1615	R1=20.0, R2=19.4	USNO-B1
101.4	193.3247	89.1953	B=21.6, R=19.6	APM-N
101.6	193.3357	89.1950	R1=20.1, R2=19.7	USNO-B1
102.4	191.7204	89.2133		NED
102.8	190.3487	89.1617		NED
103.0	190.2627	89.1616	B=21.6, R=19.6	APM-N
103.7	189.4868	89.1823	B1=20.9, B2=20.4	USNO-B1
104.5	191.7201	89.1550	B1=20.6, I=16.2	USNO-B1
105.0	193.4704	89.1925	R1=19.6, R2=19.8	USNO-B1
105.5	190.0037	89.2058		NED
107.3	189.4789	89.1919	B2=20.1, I=18.9, R2=19.5	USNO-B1
109.6	190.0030	89.2058	B1=20.7, B2=20.3, I=17.2, R1=19.1, R2=17.9	USNO-B1
110.3	189.8054	89.1661		NED
110.4	192.6312	89.2111		NED
110.5	190.7958	89.2144		NED
110.5	189.9914	89.2060	B=20.3, R=18.2	APM-N
110.6	192.0750	89.2147		NED
110.9	191.4988	89.1542		NED
110.9	189.4132	89.1923	B1=19.5, I=19.3	USNO-B1
111.0	189.9871	89.2062	B=21.0, R=18.9	APM-N
112.3	192.5383	89.1581		NED
112.6	189.3025	89.1806		NED
113.7	192.1767	89.1553		NED
113.8	192.9787	89.2086		NED
114.5	193.3200	89.1675		NED
115.6	189.2634	89.1808	B1=20.4, I=18.9, R2=19.9	USNO-B1
116.1	189.9577	89.1606	B2=20.7, R1=19.5	USNO-B1
116.3	190.2096	89.2122		NED
117.7	189.9475	89.1608		NED
117.7	190.6444	89.1536	B=21.0, R=20.0	APM-N
118.6	193.6567	89.1724	B=19.4, R=17.4	APM-N
118.6	193.6599	89.1725	B=19.5, R=18.3	APM-N
118.9	193.7086	89.1948	B2=17.6, I=15.8, R2=16.5	USNO-B1
119.0	193.7071	89.1950		NED
120.4	193.7166	89.1957	B1=17.7, I=17.4, R1=16.1	USNO-B1
120.8	193.7429	89.1947		NED
121.8	192.3658	89.1539		NED
122.0	189.3833	89.2019		NED
122.1	192.0839	89.1510	B1=20.9, I=19.1	USNO-B1
122.4	193.6688	89.1722		NED
122.8	189.5821	89.2067		NED
123.2	193.8342	89.1792		NED
123.2	189.4331	89.1670	B=20.5, R=17.8	APM-N
123.6	189.4190	89.1671	B=20.5, R=18.5	APM-N
123.7	193.5375	89.2033		NED
124.4	189.4233	89.1669		NED
125.1	193.8335	89.1949	B1=20.0, B2=19.1, I=16.6, R1=17.6, R2=17.7	USNO-B1
125.2	193.3917	89.1639		NED
125.3	192.3762	89.2175		NED
125.5	189.1112	89.1764		NED
125.6	189.0621	89.1925		NED
125.8	193.8429	89.1950		NED
125.8	193.4399	89.1629	B1=21.1, I=18.9	USNO-B1
126.1	192.0804	89.1511		NED
126.5	189.8750	89.1586		NED
127.2	190.2333	89.2144	B=21.4, R=20.0	APM-N
127.3	191.7021	89.2203		NED
127.6	189.1342	89.1733		NED
128.5	189.5445	89.1621	B=21.0, R=19.2	APM-N
129.5	191.0654	89.1497		NED
129.7	190.4708	89.1522		NED
129.8	189.5617	89.1619		NED
131.5	193.8853	89.1710	B=18.1, R=20.0	APM-N
131.8	190.5637	89.2194		NED
132.6	189.5066	89.1610	B1=21.0, I=19.0	USNO-B1
132.7	193.3592	89.2108		NED
133.9	193.8783	89.2003		NED
134.3	188.8621	89.1819		NED
134.5	190.0504	89.1539		NED
134.6	193.7887	89.2036		NED
135.2	189.0969	89.2000	B=21.6, R=20.0	APM-N
135.2	189.1179	89.2028		NED
135.7	193.8008	89.1678		NED
136.4	194.1346	89.1847		NED
137.6	194.0621	89.1961		NED
137.8	191.4812	89.2233		NED
140.1	191.9708	89.2233		NED
140.7	191.3887	89.1461		NED
141.3	194.2096	89.1911		NED
141.4	189.7421	89.1547		NED
141.7	189.1792	89.2078		NED
142.2	191.4840	89.2234	B1=19.7, B2=18.8, I=15.7, R1=16.5, R2=16.7	USNO-B1
142.4	188.7454	89.1781		NED
142.5	188.9607	89.1687	B=21.2, R=20.0	APM-N
142.6	194.0642	89.1714		NED
142.9	189.9083	89.1525		NED
144.4	192.1792	89.1464		NED
144.8	194.3008	89.1867		NED
145.0	190.7205	89.2226	B1=20.8, B2=21.0, R2=19.1	USNO-B1
145.4	194.1817	89.1739		NED
145.5	189.2767	89.1600		NED
146.1	189.4033	89.1570	I=18.5, R1=20.3	USNO-B1
146.3	194.3075	89.1808		NED
148.0	188.6017	89.1811		NED
148.1	191.6280	89.1428	I=18.3, R1=19.4, R2=19.8	USNO-B1
148.5	191.6077	89.1426	B=21.6, R=19.7	APM-N
148.6	189.5604	89.1544		NED
149.0	189.2879	89.2131		NED
149.8	188.7388	89.2008		NED
150.6	191.9898	89.1427	B2=21.8, I=17.6, R1=19.5, R2=19.5	USNO-B1
150.8	188.7972	89.2012	B1=20.7, B2=21.1, I=18.0, R2=19.6	USNO-B1
151.1	192.6146	89.1467		NED
151.4	188.6471	89.1736		NED
152.2	194.2183	89.2022		NED
152.4	190.7139	89.1431	B1=20.9, I=18.3, R1=19.1, R2=19.0	USNO-B1
152.9	191.6146	89.1428		NED
153.5	188.7333	89.2010	B=21.6, R=19.9	APM-N
153.6	194.4988	89.1836	B1=20.8, R2=19.7	USNO-B1
153.9	189.1594	89.2112	B=20.7, R=19.6	APM-N
154.3	192.8379	89.1472		NED
154.7	188.8100	89.2064		NED
154.8	191.9867	89.1428		NED
155.3	190.7158	89.1433		NED
155.6	189.7427	89.2195	B=21.6, R=16.4	APM-N
157.2	193.5588	89.1520	B1=21.1, B2=20.8, I=18.8	USNO-B1
157.4	194.1104	89.2083		NED
157.9	188.4438	89.1778		NED
158.3	189.2427	89.2144	B=21.3, R=20.0	APM-N
158.3	194.5496	89.1906		NED
158.9	193.4105	89.1495	B1=20.6, I=18.2, R1=19.5, R2=19.4	USNO-B1
159.6	189.3667	89.1531		NED
159.6	188.5911	89.2006	B=20.9, R=20.0	APM-N
161.1	192.3413	89.2283		NED
161.9	188.3079	89.1869		NED
162.1	188.5285	89.2003	B=21.6, R=19.6	APM-N
162.5	194.5012	89.1997		NED
162.6	188.3878	89.1936	B1=20.8, B2=20.6	USNO-B1
162.9	192.8387	89.1444		NED
163.3	193.4104	89.1494		NED
163.5	193.1464	89.2231	B=21.6, R=19.9	APM-N
164.0	193.2887	89.1481		NED
164.1	188.3073	89.1878	B=21.1, R=20.0	APM-N
165.0	188.7196	89.2100		NED
165.3	194.6432	89.1746	B1=20.7, B2=19.9, I=18.2, R1=19.2, R2=19.0	USNO-B1
165.4	189.9938	89.2261		NED
166.1	194.6617	89.1748	B=20.9, R=19.4	APM-N
166.3	194.6653	89.1748	B=20.6, R=18.8	APM-N
166.3	190.9967	89.1394		NED
167.0	192.0700	89.2308		NED
167.2	188.3863	89.1711		NED
167.9	189.7738	89.1456		NED
168.8	194.6667	89.1747		NED
169.1	192.3727	89.1386	B=20.7, R=19.0	APM-N
169.3	188.2879	89.1736		NED
169.8	188.1646	89.1828		NED
169.8	189.9921	89.2261	B1=17.1, B2=16.7, I=15.2, R1=15.2, R2=16.0	USNO-B1
169.9	192.0192	89.1386		NED
170.6	194.5971	89.2028		NED
172.1	192.3563	89.1392		NED
173.3	188.1467	89.1772		NED
173.8	188.1137	89.1939		NED
174.4	194.7317	89.2006		NED
177.1	193.1263	89.1422		NED
177.1	191.1929	89.2342		NED
177.4	194.1254	89.1542		NED
177.4	188.0237	89.1814		NED
178.1	188.1896	89.1700		NED
178.4	192.7063	89.2317		NED
178.9	187.9788	89.1883		NED
179.4	192.8677	89.2300	B1=19.8, I=18.5	USNO-B1
179.5	192.0008	89.2344		NED
180.9	195.0054	89.1850		NED
181.0	188.0794	89.1730	B=21.2, R=20.0	APM-N
181.0	188.5096	89.2136		NED
181.2	191.8507	89.2340	B=21.6, R=20.0	APM-N
182.4	192.6845	89.2318	B=21.6, R=19.8	APM-N
182.4	194.5329	89.2122		NED
183.3	188.7525	89.2192		NED
183.7	190.2025	89.2331		NED
184.2	193.7617	89.1464		NED
184.3	191.7725	89.1342		NED
185.3	195.0054	89.1753		NED
185.6	193.6067	89.2272		NED
185.6	187.9083	89.1769		NED
185.7	193.8396	89.2250		NED
185.9	190.2154	89.2336		NED
186.1	188.0938	89.1675		NED
186.2	191.2859	89.1323	B1=21.0, B2=21.5	USNO-B1
186.2	194.6099	89.1582	B1=21.0, I=18.3	USNO-B1
186.4	194.2921	89.2189		NED
187.2	192.2462	89.2348	B2=21.4, R2=19.8	USNO-B1
187.3	194.6021	89.1594		NED
187.6	194.1663	89.2214		NED
187.6	189.0127	89.1465	B=20.1, R=18.8	APM-N
187.6	189.0083	89.2244		NED
187.6	189.0597	89.1458	R1=19.4, R2=19.4	USNO-B1
187.7	189.0205	89.1463	B2=19.9, I=18.5, R1=19.4, R2=18.5	USNO-B1
187.9	187.8038	89.1889		NED
188.0	188.9963	89.1465	B=19.9, R=19.4	APM-N
188.5	192.3612	89.2361		NED
188.6	192.0791	89.1322	B1=20.6, R1=19.8	USNO-B1
188.9	187.7925	89.1825		NED
189.3	189.4912	89.1403	B=20.4, R=18.8	APM-N
189.4	189.4955	89.1402	B=20.9, R=18.1	APM-N
189.5	188.4563	89.2167		NED
189.5	190.2492	89.2350		NED
189.7	195.1317	89.1783		NED
189.7	194.4575	89.2175		NED
190.0	194.9404	89.1678		NED
190.1	189.0046	89.1464		NED
190.5	192.0200	89.2375		NED
191.1	190.2937	89.1350		NED
192.2	189.4971	89.1403		NED
192.9	192.1272	89.1311	B=21.2, R=20.0	APM-N
193.0	192.0957	89.1310	B=21.6, R=20.0	APM-N
193.1	193.5199	89.1391	B=21.6, R=19.9	APM-N
193.3	193.2433	89.2328		NED
193.6	193.1483	89.1372		NED
193.7	192.8338	89.1350		NED
194.3	190.7965	89.2369	B1=21.0, I=18.4, R1=20.0	USNO-B1
194.5	189.5747	89.1378	I=17.9, R1=19.8, R2=19.8	USNO-B1
194.5	192.1273	89.1306	B1=20.6, B2=21.5, I=18.7	USNO-B1
195.2	192.1103	89.1304	B1=20.7, B2=21.1, I=18.5	USNO-B1
196.0	195.2763	89.1933		NED
196.1	191.3713	89.1306		NED
196.1	187.7258	89.1983		NED
196.6	188.1054	89.2128		NED
196.7	192.5667	89.2375		NED
196.9	191.7854	89.2397		NED
197.7	193.1213	89.1343	B1=21.0, I=18.2	USNO-B1
198.6	187.7225	89.2011		NED
198.9	194.7357	89.1546	B1=20.3, B2=19.9, I=18.4, R1=19.2, R2=18.9	USNO-B1
199.1	187.7838	89.1692		NED
199.2	194.5425	89.2203		NED
199.2	192.0917	89.1306		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