Swift Trigger: 1129775;

Presumed name: GRB 221016A

BAT	02^h 35^m 47.76^s, -34° 37′ 26.4″
position:	(38.949, -34.624 ± 180″)
XRT	02^h 35^m 46.75^s, -34° 36′ 37.4″
position:	(38.94479, -34.61039 ± 3.7″)
UVOT	No position available.
Galactic N_HI:	3.24×10²⁰ cm^-2
Galactic E(B-V):	0.027 mag

Best RA:	02^h 35^m 46.75^s	= 38.94479 d
Best Dec:	-34° 36′ 37.4″	= -34.61039 d

Gal Lat:	-66.47
Gal Long:	237.89

Sun angle:	133.33°, 10.8 hr West

Galaxies within 200 of XRT position

	RA*	Dec*		Catalogue
14.9	38.9429	-34.6142		NED
21.8	38.9508	-34.6136		NED
34.9	38.9425	-34.6200		NED
36.1	38.9438	-34.6004	h=14.3, j=15.1, k=14.0	2MASS
36.2	38.9438	-34.6003		NED
36.3	38.9433	-34.6003	Mag=18.27	NED
36.3	38.9437	-34.6003	B=18.2, R2=16.2, i=16.3	SSS
37.9	38.9433	-34.5999	B2=20.0, R2=20.0	USNO-B1
38.5	38.9438	-34.5997	Mag=19.0	NED
39.1	38.9423	-34.5997	B2=19.8, R1=18.8	USNO-B1
39.7	38.9415	-34.5997	B=21.4	SSS
40.1	38.9579	-34.6133		NED
40.8	38.9554	-34.6031		NED
45.1	38.9354	-34.6005	R1=20.2, R2=21.7	USNO-B1
45.2	38.9354	-34.6006		NED
46.3	38.9600	-34.6078		NED
47.7	38.9335	-34.6198	B=21.6	SSS
49.9	38.9321	-34.6194		NED
50.7	38.9292	-34.6167		NED
54.7	38.9612	-34.6033		NED
55.0	38.9592	-34.6007	B=20.6, R2=18.1, i=17.8	SSS
55.1	38.9592	-34.6008	Mag=18.7	NED
58.1	38.9554	-34.5969		NED
59.4	38.9646	-34.6111		NED
59.5	38.9638	-34.6047		NED
59.6	38.9636	-34.6045	B=22.2, R2=20.3	SSS
63.6	38.9504	-34.5933		NED
66.5	38.9288	-34.5975		NED
66.9	38.9263	-34.5997		NED
67.2	38.9287	-34.5972	B=20.8, R2=19.8	SSS
69.8	38.9617	-34.5969		NED
70.3	38.9358	-34.5922		NED
70.7	38.9533	-34.5922		NED
71.5	38.9667	-34.6186		NED
73.0	38.9338	-34.6286		NED
76.5	38.9200	-34.6039		NED
79.1	38.9262	-34.6261	B2=21.5, R2=20.0	USNO-B1
80.0	38.9717	-34.6108		NED
84.8	38.9267	-34.6286		NED
85.0	38.9633	-34.5925	Mag=19.6	NED
85.1	38.9408	-34.5869		NED
85.6	38.9471	-34.5867		NED
89.9	38.9300	-34.6322		NED
90.4	38.9746	-34.6156		NED
90.8	38.9592	-34.6328		NED
91.5	38.9400	-34.6356		NED
93.2	38.9325	-34.6342		NED
93.8	38.9467	-34.6364		NED
94.3	38.9471	-34.6365	B=21.1, R2=19.7	SSS
95.6	38.9144	-34.6194	B=21.8	SSS
95.9	38.9771	-34.6081		NED
97.6	38.9150	-34.6222		NED
97.6	38.9121	-34.6147		NED
97.9	38.9121	-34.6144		NED
101.8	38.9554	-34.6372		NED
102.2	38.9567	-34.5839		NED
102.7	38.9728	-34.5936	B=20.8, R2=19.3	SSS
103.0	38.9728	-34.5934	B2=20.8, R2=20.9	USNO-B1
103.7	38.9617	-34.5853		NED
104.3	38.9121	-34.5992		NED
105.2	38.9746	-34.5944		NED
105.6	38.9684	-34.5884	B=22.1	SSS
106.2	38.9138	-34.6253		NED
106.8	38.9726	-34.5915	B=21.9	SSS
107.5	38.9671	-34.6339		NED
108.5	38.9804	-34.6175		NED
109.7	38.9396	-34.6406		NED
111.1	38.9188	-34.5881	Mag=19.2	NED
111.4	38.9333	-34.5808		NED
111.6	38.9182	-34.5885	B=20.6, R2=19.1	SSS
112.1	38.9462	-34.5792		NED
112.3	38.9250	-34.6369	Mag=19.7	NED
112.7	38.9683	-34.5858		NED
113.7	38.9681	-34.5853	B=21.3, R2=19.7	SSS
114.1	38.9245	-34.6373	B=22.0	SSS
115.1	38.9085	-34.5990	I=18.8, R2=20.6	USNO-B1
115.3	38.9833	-34.6058		NED
116.0	38.9492	-34.6425		NED
116.3	38.9150	-34.6317		NED
117.4	38.9446	-34.6431		NED
118.9	38.9313	-34.6414		NED
120.4	38.9088	-34.6261		NED
120.8	38.9692	-34.6372		NED
122.3	38.9062	-34.5978		NED
122.8	38.9838	-34.6214		NED
123.4	38.9840	-34.6220	B=22.0	SSS
123.7	38.9046	-34.6197		NED
123.8	38.9404	-34.6447		NED
125.2	38.9313	-34.6433		NED
125.9	38.9175	-34.6372		NED
126.4	38.9712	-34.5828		NED
126.5	38.9713	-34.5829	B=21.5, R2=20.3	SSS
126.5	38.9804	-34.6300		NED
128.6	38.9609	-34.6435	B2=17.3, I=18.6	USNO-B1
129.7	38.9029	-34.6206		NED
129.8	38.9607	-34.6440	B=18.9, R2=17.2, i=17.0	SSS
129.8	38.9809	-34.5900	B=21.7, R2=20.0	SSS
130.1	38.9604	-34.6442	Mag=19.06	NED
130.2	38.9808	-34.5900		NED
132.9	38.9317	-34.5750		NED
132.9	38.9000	-34.6119		NED
133.4	38.9892	-34.6164	Mag=18.2	NED
133.5	38.9880	-34.5998	B=21.4, R2=21.4	SSS
133.8	38.9108	-34.5858		NED
133.9	38.9894	-34.6165	B=18.8, R2=17.8, i=17.5	SSS
135.7	38.9875	-34.5969		NED
137.0	38.9904	-34.6168	B2=18.7, I=17.6	USNO-B1
137.8	38.9483	-34.5722		NED
137.8	38.9171	-34.6411		NED
137.9	38.9050	-34.6303	I=18.8, R2=21.3	USNO-B1
138.1	38.9050	-34.6303		NED
138.6	38.9421	-34.6489		NED
139.3	38.9900	-34.6214		NED
140.6	38.9100	-34.6369		NED
142.0	38.9888	-34.6264	Mag=19.4	NED
142.9	38.9619	-34.5733	B=21.9, R2=20.4	SSS
143.1	38.9889	-34.6266	B=21.2, R2=19.6	SSS
143.8	38.9618	-34.5730	B2=21.4, I=18.4, R2=20.6	USNO-B1
144.5	38.9929	-34.6164		NED
144.5	38.9067	-34.6356		NED
146.1	38.9125	-34.6411		NED
146.3	38.9746	-34.6428		NED
146.4	38.9283	-34.6489		NED
146.4	38.9908	-34.6247		NED
147.6	38.9871	-34.5889	Mag=19.63	NED
148.0	38.9873	-34.5888	B=19.6, R2=17.4, i=17.1	SSS
149.5	38.8996	-34.5919		NED
152.2	38.9571	-34.6514		NED
152.5	38.9946	-34.6206		NED
153.1	38.9517	-34.6525		NED
153.5	38.9288	-34.6508		NED
154.9	38.9712	-34.6475		NED
155.8	38.9358	-34.6531		NED
158.4	38.9438	-34.6544		NED
159.4	38.9479	-34.6544		NED
159.7	38.9929	-34.5906		NED
159.7	38.8942	-34.5950		NED
160.1	38.9850	-34.6400		NED
160.3	38.9471	-34.5658		NED
160.4	38.9300	-34.5675		NED
160.9	38.9592	-34.5672		NED
160.9	38.9092	-34.5767		NED
161.7	38.9800	-34.6444		NED
163.8	38.9167	-34.5714		NED
164.1	38.9108	-34.5742		NED
164.6	38.9863	-34.5800		NED
166.2	38.9154	-34.6497	B=22.1, R2=20.5	SSS
166.4	39.0000	-34.6028		NED
166.7	38.9267	-34.6542		NED
167.1	38.9950	-34.5892		NED
167.5	38.9996	-34.5992		NED
168.8	38.9138	-34.6497		NED
169.7	38.9996	-34.5969		NED
171.3	38.8871	-34.6133		NED
172.7	38.9975	-34.6308		NED
173.0	38.9042	-34.6447		NED
173.0	38.9992	-34.5928		NED
173.5	38.9088	-34.6483		NED
173.6	38.9375	-34.5625		NED
173.6	38.9375	-34.5625	B=21.3, R2=19.3, i=17.9	SSS
174.2	38.9995	-34.5927	B=21.7, R2=20.2	SSS
174.3	39.0033	-34.6133		NED
174.4	38.8954	-34.5836		NED
175.7	38.9625	-34.5639		NED
176.1	38.8863	-34.6186		NED
176.4	38.9308	-34.6581		NED
176.8	38.9188	-34.5661		NED
177.0	38.9825	-34.6485	B=22.2	SSS
177.2	38.9417	-34.6594		NED
177.4	38.9858	-34.6464		NED
178.5	38.9788	-34.5694		NED
178.9	38.9458	-34.5608		NED
179.0	38.9482	-34.6600	B2=18.4, I=17.6, R1=17.2, R2=17.0	USNO-B1
179.0	39.0033	-34.5983		NED
179.5	38.9483	-34.6603		NED
179.6	38.9000	-34.6439		NED
180.0	38.9363	-34.6600		NED
180.0	38.9746	-34.6539		NED
180.6	38.8858	-34.5981		NED
180.7	38.8885	-34.6297	B=22.4	SSS
180.8	38.9579	-34.5614		NED
180.9	38.9783	-34.6522		NED
181.6	39.0054	-34.6039		NED
181.7	39.0000	-34.5886	Mag=20.19	NED
182.0	39.0000	-34.5883	B=20.1, R2=17.9, i=17.4	SSS
182.5	38.9033	-34.6481		NED
183.4	38.8837	-34.6014		NED
183.5	38.9846	-34.6494		NED
183.6	38.8829	-34.6064		NED
183.8	38.8942	-34.5808		NED
183.9	38.8829	-34.6161		NED
184.1	38.8941	-34.5808	B=22.7, R2=21.3	SSS
185.3	38.9975	-34.6381		NED
186.1	39.0050	-34.6253		NED
186.7	38.9263	-34.5608		NED
187.3	38.9746	-34.5647		NED
188.4	39.0080	-34.6158	B=21.9, R2=21.4	SSS
188.5	38.9100	-34.5664		NED
188.6	38.9154	-34.5639		NED
188.6	39.0029	-34.6319		NED
190.7	38.9042	-34.6517		NED
191.0	38.9817	-34.6539		NED
191.3	38.9096	-34.6550		NED
192.2	39.0067	-34.6258		NED
192.5	38.8796	-34.6119		NED
192.7	39.0046	-34.5900		NED
193.0	38.9865	-34.5692	B=20.8	SSS
193.9	39.0092	-34.6189		NED
195.5	38.9358	-34.5567		NED
197.3	39.0113	-34.6128		NED
198.1	39.0113	-34.6164		NED
198.5	38.9892	-34.5691	B=19.9	SSS
199.1	38.8925	-34.6453		NED
199.4	38.9925	-34.5713	B=20.0	SSS
200.0	38.8883	-34.6411		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