Swift Trigger: 1519536;

Presumed name: GRB 261017A

BAT	09^h 19^m 36.00^s, +12° 38′ 38.4″
position:	(139.900, 12.644 ± 180″)
XRT	09^h 19^m 37.12^s, +12° 38′ 15.8″
position:	(139.90465, 12.63772 ± 4.9″)
UVOT	No position available.
Galactic N_HI:	2.81×10²⁰ cm^-2
Galactic E(B-V):	0.027 mag

Best RA:	09^h 19^m 37.12^s	= 139.90465 d
Best Dec:	+12° 38′ 15.8″	= 12.63772 d

Gal Lat:	38.53
Gal Long:	218.31

Sun angle:	65.60°, 4.1 hr West

Galaxies within 200 of XRT position

	RA*	Dec*		Catalogue
18.0	139.9082	12.6413	R=20.6, g=21.6, i=20.3, u=23.3, z=19.8	SDSS
24.0	139.9004	12.6325	R=21.2, g=22.5, i=20.7, u=23.4, z=20.3	SDSS
30.2	139.9018	12.6456	R=22.0, g=23.0, i=21.6, u=24.9, z=21.1	SDSS
32.9	139.9067	12.6467	R=21.4, g=22.3, i=21.3, u=23.1, z=20.7	SDSS
35.4	139.9039	12.6279	R=22.3, g=23.1, i=22.3, u=25.8, z=21.6	SDSS
36.5	139.9145	12.6345	R=18.6, g=19.4, i=18.2, u=20.6, z=17.9	SDSS
36.6	139.9145	12.6345	B=21.0, R=18.9	APM-N
37.6	139.9026	12.6275	R=21.4, g=22.9, i=20.4, u=23.3, z=20.1	SDSS
38.4	139.8938	12.6387	R=21.5, g=22.4, i=21.2, u=22.3, z=20.7	SDSS
44.7	139.9005	12.6494	R=20.6, g=21.6, i=20.1, u=23.3, z=19.7	SDSS
48.4	139.9022	12.6245	R=19.8, g=20.6, i=19.4, u=22.2, z=19.3	SDSS
51.8	139.8902	12.6405	R=22.1, g=24.5, i=21.8, u=23.9, z=20.8	SDSS
52.2	139.9195	12.6370	R=21.3, g=22.1, i=21.2, u=22.6, z=22.3	SDSS
52.6	139.8907	12.6431	R=21.8, g=22.8, i=21.6, u=23.0, z=22.3	SDSS
54.5	139.8948	12.6494	I=19.1, R2=19.6	USNO-B1
55.2	139.9040	12.6530	R=19.5, g=21.0, i=18.9, u=25.8, z=18.6	SDSS
55.3	139.9040	12.6531	B2=20.9, I=18.9, R2=19.2	USNO-B1
55.5	139.9175	12.6466	R=21.5, g=22.1, i=20.4, u=25.7, z=20.6	SDSS
59.3	139.8882	12.6413	R=23.2, g=24.7, i=22.0, u=24.3, z=21.0	SDSS
60.7	139.8885	12.6318	R=21.4, g=23.0, i=21.3, u=22.4, z=21.4	SDSS
61.4	139.9113	12.6219	R=18.9, g=19.8, i=18.4, u=22.0, z=18.0	SDSS
62.0	139.9176	12.6494	B=20.9, R=18.2	APM-N
62.2	139.9177	12.6494	R=18.0, g=19.2, i=17.6, u=21.3, z=17.2	SDSS
64.3	139.9078	12.6553	R=21.0, g=22.0, i=20.5, u=25.4, z=20.5	SDSS
65.5	139.9031	12.6559	R=23.1, g=24.5, i=21.8, u=25.0, z=20.7	SDSS
72.5	139.9011	12.6576	R=21.7, g=22.5, i=21.3, u=22.6, z=20.8	SDSS
72.9	139.8944	12.6201	R=22.0, g=23.4, i=21.7, u=24.3, z=21.3	SDSS
74.9	139.9201	12.6234	R=22.9, g=24.7, i=21.8, u=23.3, z=21.0	SDSS
76.2	139.9248	12.6299	R=22.7, g=22.8, i=24.7, u=25.9, z=23.2	SDSS
80.7	139.9276	12.6374	R=22.1, g=23.0, i=21.7, u=23.4, z=21.5	SDSS
83.6	139.9283	12.6352	R=22.4, g=22.9, i=22.1, u=23.1, z=22.8	SDSS
84.1	139.8840	12.6259	R=22.1, g=24.1, i=23.4, u=24.9, z=21.7	SDSS
84.2	139.8825	12.6288	R=23.0, g=22.5, i=22.4, u=23.5, z=21.4	SDSS
85.0	139.8808	12.6336	R=22.4, g=24.0, i=21.4, u=26.1, z=20.5	SDSS
86.9	139.8844	12.6238	R=23.2, g=24.5, i=22.2, u=25.4, z=21.7	SDSS
94.1	139.9314	12.6376	B2=20.4, R1=19.2	USNO-B1
97.3	139.8779	12.6446	B2=21.2, I=19.6, R1=19.6	USNO-B1
97.8	139.9005	12.6108	B2=21.1, I=18.2, R1=19.1, R2=19.9	USNO-B1
98.4	139.9054	12.6651	R=21.3, g=21.9, i=21.0, u=22.4, z=21.4	SDSS
98.7	139.8823	12.6543	R=20.9, g=21.5, i=20.5, u=21.5, z=20.4	SDSS
99.7	139.8775	12.6459	B=22.0, R=20.0	APM-N
101.2	139.8874	12.6603	R=21.6, g=22.6, i=21.7, u=24.1, z=21.0	SDSS
101.9	139.9236	12.6591	R=21.2, g=22.1, i=20.9, u=24.1, z=21.0	SDSS
102.4	139.9050	12.6662	R=22.0, g=24.0, i=20.8, u=24.0, z=20.1	SDSS
104.3	139.9326	12.6474	R=21.2, g=22.1, i=21.4, u=23.1, z=20.5	SDSS
107.5	139.8866	12.6136	B2=21.8, R2=20.0	USNO-B1
107.7	139.9106	12.6084	R=20.4, g=21.7, i=18.9, u=22.7, z=18.8	SDSS
107.8	139.8864	12.6136	R=20.7, g=21.7, i=20.1, u=23.0, z=19.8	SDSS
108.0	139.9350	12.6331	R=22.2, g=22.3, i=21.4, u=23.6, z=23.5	SDSS
108.2	139.8834	12.6594	R=22.2, g=22.6, i=22.2, u=23.0, z=21.3	SDSS
108.2	139.9192	12.6642	R=22.0, g=22.9, i=20.8, u=23.9, z=20.7	SDSS
108.8	139.9031	12.6679	R=21.9, g=23.3, i=20.6, u=24.5, z=20.5	SDSS
111.1	139.8873	12.6119	R=20.3, g=21.3, i=20.1, u=21.8, z=19.7	SDSS
112.1	139.8871	12.6117	B2=22.0, I=18.9, R1=18.9, R2=20.1	USNO-B1
112.6	139.9012	12.6066	R=22.5, g=22.8, i=22.7, u=23.7, z=21.7	SDSS
113.1	139.9348	12.6268	R=20.0, g=20.9, i=19.6, u=22.1, z=19.4	SDSS
114.1	139.9272	12.6149	R=20.5, g=21.4, i=20.2, u=22.2, z=19.8	SDSS
114.2	139.8808	12.6162	R=22.3, g=23.2, i=21.8, u=23.5, z=21.5	SDSS
117.4	139.8726	12.6284	R=22.1, g=22.7, i=21.8, u=23.4, z=21.1	SDSS
118.5	139.8749	12.6223	R=22.6, g=23.6, i=21.5, u=23.4, z=21.0	SDSS
119.0	139.9176	12.6072	R=21.9, g=22.7, i=22.6, u=25.4, z=21.3	SDSS
119.5	139.9151	12.6693	R=23.5, g=24.8, i=22.2, u=26.1, z=22.0	SDSS
120.0	139.9378	12.6458	R=23.7, g=24.2, i=21.8, u=25.0, z=22.1	SDSS
121.0	139.8779	12.6165	R=21.2, g=22.5, i=21.5, u=25.6, z=21.9	SDSS
122.1	139.9333	12.6186	R=24.2, g=25.3, i=24.6, u=23.8, z=20.2	SDSS
123.5	139.9289	12.6128	R=22.5, g=23.0, i=21.7, u=22.2, z=22.4	SDSS
124.2	139.8954	12.6710	R=22.3, g=23.1, i=22.0, u=23.8, z=21.8	SDSS
124.6	139.9133	12.6713	R=22.2, g=23.6, i=20.9, u=24.5, z=20.4	SDSS
124.6	139.8727	12.6228	R=18.5, g=20.1, i=18.0, u=21.2, z=17.6	SDSS
125.0	139.9226	12.6677	R=22.0, g=22.1, i=21.1, u=22.9, z=24.1	SDSS
126.2	139.9193	12.6697	B=16.0, R=14.5	APM-N
126.3	139.9084	12.6726	R=20.4, g=21.5, i=19.8, u=23.5, z=19.5	SDSS
127.3	139.9393	12.6481	R=22.3, g=24.0, i=22.1, u=24.0, z=22.2	SDSS
127.8	139.8831	12.6663	R=20.3, g=21.0, i=20.0, u=21.6, z=20.0	SDSS
128.3	139.9043	12.6021	R=22.0, g=22.7, i=21.7, u=22.9, z=20.6	SDSS
129.9	139.9383	12.6228	R=19.2, g=20.5, i=18.7, u=21.8, z=18.3	SDSS
132.2	139.8968	12.6018	R=22.9, g=23.9, i=21.8, u=23.3, z=21.6	SDSS
132.2	139.9229	12.6698	R=20.5, g=22.8, i=19.0, u=23.5, z=19.2	SDSS
132.6	139.8703	12.6225	R=19.3, g=20.9, i=18.6, u=25.8, z=18.2	SDSS
132.7	139.9168	12.6726	R=21.8, g=23.7, i=20.5, u=22.4, z=19.8	SDSS
132.9	139.8668	12.6383	B2=21.1, I=18.0, R2=19.7	USNO-B1
133.1	139.8701	12.6225	B=22.1, R=19.5	APM-N
133.5	139.8714	12.6199	R=20.1, g=21.6, i=19.9, u=23.4, z=19.2	SDSS
134.2	139.9311	12.6647	R=19.9, g=21.0, i=19.5, u=22.3, z=19.1	SDSS
136.7	139.8764	12.6638	R=23.6, g=25.0, i=21.2, u=25.4, z=21.6	SDSS
138.1	139.9234	12.6714	R=21.9, g=24.3, i=22.5, u=23.0, z=23.4	SDSS
138.2	139.9285	12.6072	R=22.1, g=22.8, i=22.1, u=22.6, z=21.9	SDSS
138.8	139.8842	12.6707	R=25.3, g=24.9, i=25.0, u=24.9, z=20.5	SDSS
139.4	139.9183	12.6741	R=22.8, g=24.6, i=21.4, u=23.1, z=23.0	SDSS
140.9	139.9061	12.6768	R=21.1, g=22.6, i=20.1, u=26.0, z=19.6	SDSS
141.3	139.8644	12.6366	B=22.1, R=20.0	APM-N
141.8	139.9417	12.6222	R=22.5, g=23.4, i=21.9, u=25.2, z=22.9	SDSS
143.6	139.9451	12.6434	R=22.5, g=23.1, i=22.5, u=25.5, z=21.5	SDSS
144.2	139.9000	12.6775	R=22.1, g=23.2, i=22.6, u=24.2, z=22.2	SDSS
144.4	139.8733	12.6117	R=21.2, g=22.6, i=21.1, u=23.4, z=20.9	SDSS
144.9	139.8683	12.6567	R=23.1, g=24.4, i=22.0, u=24.6, z=20.8	SDSS
145.4	139.8915	12.6760	R=21.7, g=22.6, i=21.3, u=23.7, z=21.4	SDSS
145.6	139.8649	12.6491	R=21.2, g=22.4, i=20.8, u=22.4, z=20.3	SDSS
145.6	139.8721	12.6628	R=17.1, g=20.6, i=16.8, u=21.6, z=18.9	SDSS
145.6	139.8761	12.6670	R=20.9, g=22.2, i=21.1, u=25.0, z=19.9	SDSS
147.1	139.9379	12.6626	R=21.9, g=22.5, i=21.5, u=22.6, z=21.6	SDSS
148.1	139.9179	12.5987	R=21.7, g=22.3, i=21.1, u=22.7, z=20.6	SDSS
148.7	139.8663	12.6202	R=21.3, g=22.3, i=21.4, u=23.6, z=23.3	SDSS
149.5	139.8653	12.6218	R=21.7, g=23.0, i=21.2, u=25.7, z=20.9	SDSS
150.8	139.8724	12.6654	B1=15.3, B2=14.8, R1=13.2, R2=13.4	USNO-B1
151.0	139.8957	12.6787	R=21.2, g=22.6, i=20.3, u=23.4, z=19.6	SDSS
151.2	139.9416	12.6161	R=22.3, g=24.4, i=21.6, u=23.8, z=21.4	SDSS
152.3	139.9435	12.6190	I=18.9, R2=19.1	USNO-B1
152.9	139.9437	12.6191	R=20.3, g=22.0, i=19.7, u=23.4, z=19.4	SDSS
153.8	139.8867	12.6767	R=22.6, g=22.9, i=22.8, u=23.6, z=22.4	SDSS
154.8	139.8654	12.6181	R=22.3, g=23.3, i=21.8, u=24.6, z=22.6	SDSS
155.2	139.8743	12.6064	R=21.3, g=22.6, i=20.9, u=26.0, z=20.4	SDSS
155.9	139.8617	12.6485	R=22.6, g=24.2, i=22.6, u=23.5, z=21.5	SDSS
156.0	139.9096	12.5946	R=22.0, g=23.2, i=22.0, u=26.0, z=21.3	SDSS
156.2	139.8612	12.6287	R=22.9, g=24.8, i=22.0, u=23.4, z=20.8	SDSS
156.6	139.9164	12.5958	R=21.7, g=22.4, i=21.4, u=22.3, z=20.7	SDSS
156.9	139.9403	12.6115	R=21.7, g=22.8, i=21.7, u=22.7, z=21.0	SDSS
157.5	139.8621	12.6514	R=21.2, g=22.6, i=20.6, u=26.3, z=19.8	SDSS
158.1	139.9487	12.6288	I=19.2, R2=20.2	USNO-B1
158.4	139.9006	12.6815	R=22.9, g=22.5, i=24.0, u=23.0, z=21.7	SDSS
158.8	139.9156	12.5949	R=22.3, g=23.0, i=23.1, u=23.4, z=22.1	SDSS
159.2	139.9436	12.6152	R=20.7, g=21.8, i=19.7, u=20.9, z=19.5	SDSS
159.6	139.8916	12.6802	R=24.0, g=22.8, i=22.6, u=23.1, z=22.5	SDSS
160.1	139.8644	12.6169	R=18.6, g=19.4, i=18.2, u=20.7, z=18.0	SDSS
160.5	139.9276	12.5992	R=22.0, g=24.1, i=22.0, u=25.3, z=22.0	SDSS
161.2	139.8623	12.6548	R=20.5, g=21.6, i=20.4, u=22.1, z=19.9	SDSS
161.6	139.8676	12.6644	R=26.4, g=26.1, i=19.7, u=22.6, z=21.8	SDSS
162.0	139.8652	12.6144	B2=20.8, R2=19.1	USNO-B1
163.0	139.8651	12.6141	R=19.8, g=21.0, i=19.4, u=21.9, z=19.1	SDSS
163.2	139.9228	12.6794	R=21.4, g=22.5, i=21.2, u=22.8, z=20.6	SDSS
163.8	139.8691	12.6672	R=22.4, g=23.8, i=21.1, u=25.4, z=24.7	SDSS
164.3	139.8614	12.6202	R=22.5, g=23.6, i=22.1, u=23.9, z=22.4	SDSS
164.5	139.9317	12.6004	R=22.8, g=24.2, i=21.9, u=23.6, z=21.7	SDSS
166.4	139.9259	12.5964	R=22.4, g=23.5, i=21.7, u=23.2, z=23.1	SDSS
166.8	139.8683	12.6080	I=18.7, R2=20.4	USNO-B1
166.8	139.8876	12.5945	B1=20.5, B2=20.2, I=19.1, R2=19.8	USNO-B1
166.9	139.8875	12.5945	R=19.8, g=20.6, i=19.6, u=21.6, z=19.2	SDSS
167.1	139.9276	12.5971	R=19.6, g=20.6, i=19.2, u=21.9, z=18.8	SDSS
167.2	139.9276	12.5970	B2=20.6, I=19.2, R2=19.5	USNO-B1
167.3	139.8878	12.5943	B=21.5, R=20.0	APM-N
167.8	139.8975	12.6838	R=20.8, g=21.5, i=20.6, u=22.3, z=19.9	SDSS
168.0	139.8612	12.6183	R=24.8, g=22.9, i=22.6, u=21.8, z=22.2	SDSS
168.2	139.8571	12.6325	R=22.8, g=24.6, i=21.9, u=23.6, z=20.5	SDSS
169.0	139.8610	12.6180	R=19.1, g=20.0, i=18.8, u=21.9, z=18.6	SDSS
169.2	139.8610	12.6178	B=21.4, R=19.9	APM-N
169.8	139.9300	12.6779	R=22.0, g=22.2, i=21.5, u=22.4, z=21.1	SDSS
170.5	139.9173	12.6834	R=21.3, g=22.3, i=21.1, u=23.0, z=20.4	SDSS
171.5	139.9486	12.6585	R=22.0, g=22.9, i=21.4, u=23.2, z=20.7	SDSS
172.3	139.9278	12.5955	I=19.0, R2=20.4	USNO-B1
173.5	139.8789	12.6788	R=22.6, g=22.7, i=23.1, u=24.6, z=21.5	SDSS
173.6	139.9418	12.6060	R=21.3, g=23.3, i=20.4, u=25.7, z=19.7	SDSS
173.6	139.8564	12.6273	R=21.4, g=23.0, i=21.0, u=23.9, z=20.3	SDSS
173.9	139.8630	12.6116	R=22.0, g=22.9, i=22.1, u=22.3, z=21.7	SDSS
173.9	139.8557	12.6448	R=21.9, g=22.8, i=21.4, u=23.2, z=20.4	SDSS
174.9	139.9543	12.6409	R=24.2, g=24.5, i=21.9, u=24.4, z=20.9	SDSS
175.5	139.9008	12.6863	R=21.3, g=21.8, i=21.4, u=21.9, z=21.4	SDSS
176.4	139.9109	12.6863	R=22.8, g=23.7, i=21.5, u=22.9, z=20.6	SDSS
177.0	139.9070	12.6868	R=21.8, g=22.6, i=21.7, u=23.0, z=21.5	SDSS
177.1	139.9300	12.5952	B=22.1, R=19.6	APM-N
178.0	139.9301	12.5950	R=19.4, g=21.2, i=18.7, u=25.6, z=18.2	SDSS
178.2	139.9263	12.6825	R=22.0, g=23.1, i=21.7, u=22.7, z=21.5	SDSS
178.6	139.9212	12.6846	R=21.8, g=22.4, i=21.5, u=22.9, z=21.2	SDSS
179.6	139.8652	12.6060	R=18.5, g=19.4, i=18.1, u=21.0, z=17.7	SDSS
179.6	139.9238	12.5915	R=22.3, g=23.7, i=22.3, u=24.8, z=21.3	SDSS
179.6	139.8559	12.6527	R=22.5, g=23.0, i=21.9, u=22.4, z=21.3	SDSS
180.3	139.8562	12.6211	R=22.3, g=25.3, i=21.8, u=23.0, z=21.7	SDSS
181.5	139.8912	12.6864	R=22.6, g=24.0, i=21.6, u=22.9, z=21.6	SDSS
181.9	139.9505	12.6143	B=21.5, R=20.0	APM-N
181.9	139.9459	12.6683	R=21.5, g=22.8, i=21.0, u=25.4, z=20.8	SDSS
182.7	139.9209	12.5895	R=22.5, g=23.2, i=22.2, u=24.2, z=21.2	SDSS
183.2	139.9346	12.5961	R=22.4, g=23.8, i=22.8, u=24.4, z=21.4	SDSS
183.4	139.8593	12.6630	R=22.5, g=22.7, i=21.8, u=24.2, z=21.9	SDSS
184.3	139.8749	12.6799	B1=19.6, B2=19.1, I=18.0, R1=18.5, R2=18.2	USNO-B1
185.4	139.8779	12.6821	R=21.7, g=22.5, i=21.6, u=23.3, z=21.5	SDSS
186.4	139.8783	12.5928	R=21.1, g=21.8, i=21.2, u=22.3, z=20.5	SDSS
186.8	139.9187	12.6878	I=18.5, R2=19.3	USNO-B1
186.9	139.9527	12.6154	R=20.8, g=22.5, i=20.1, u=22.5, z=19.7	SDSS
187.4	139.8740	12.5951	R=22.0, g=23.3, i=21.5, u=26.4, z=20.9	SDSS
187.6	139.9502	12.6105	R=21.6, g=22.8, i=21.0, u=24.0, z=21.0	SDSS
187.6	139.9511	12.6119	R=21.1, g=22.1, i=20.9, u=23.3, z=21.1	SDSS
188.1	139.9197	12.6879	R=18.2, g=18.8, i=17.8, u=20.1, z=17.6	SDSS
188.3	139.8968	12.5860	R=22.1, g=22.7, i=21.8, u=24.0, z=22.9	SDSS
188.6	139.8652	12.6732	R=22.2, g=23.0, i=22.0, u=24.5, z=22.6	SDSS
188.8	139.9524	12.6618	R=18.4, g=19.0, i=18.0, u=20.1, z=17.7	SDSS
189.3	139.9526	12.6618	B=20.6, R=18.6	APM-N
189.6	139.9586	12.6356	h=14.5, j=15.2, k=14.2	2MASS
189.6	139.9586	12.6358	R=17.1, g=18.2, i=16.7, u=20.1, z=16.3	SDSS
189.7	139.8760	12.5931	R=21.3, g=22.2, i=21.1, u=22.3, z=20.7	SDSS
189.7	139.8897	12.6884	R=21.8, g=23.4, i=20.9, u=25.6, z=20.3	SDSS
189.9	139.9587	12.6359	B=19.7, R=17.1	APM-N
190.1	139.8506	12.6351	R=21.3, g=22.1, i=20.5, u=23.7, z=20.7	SDSS
191.0	139.9027	12.6908	R=23.3, g=24.9, i=22.1, u=24.6, z=22.3	SDSS
193.3	139.9061	12.5840	R=20.0, g=21.0, i=19.7, u=21.7, z=19.3	SDSS
193.5	139.9457	12.6019	R=22.5, g=22.8, i=21.4, u=22.9, z=21.1	SDSS
193.9	139.9058	12.5839	B2=20.6, I=18.8	USNO-B1
194.5	139.9322	12.5909	R=20.7, g=21.3, i=20.5, u=21.9, z=20.6	SDSS
194.9	139.8713	12.6810	R=21.6, g=22.1, i=21.0, u=23.9, z=20.8	SDSS
195.6	139.9543	12.6622	R=22.4, g=23.1, i=21.8, u=23.6, z=21.4	SDSS
196.4	139.8558	12.6642	R=20.8, g=22.0, i=20.3, u=23.4, z=19.9	SDSS
197.5	139.9607	12.6338	B2=20.6, I=18.9, R2=19.8	USNO-B1
197.7	139.9538	12.6645	B2=20.6, I=18.9, R2=19.7	USNO-B1
197.8	139.9539	12.6644	R=19.7, g=20.8, i=19.3, u=21.4, z=19.1	SDSS
198.1	139.8515	12.6562	R=21.5, g=22.7, i=20.6, u=26.7, z=21.3	SDSS
198.6	139.8959	12.6922	R=22.2, g=24.2, i=22.3, u=23.1, z=22.2	SDSS
198.8	139.9171	12.6916	R=22.1, g=23.2, i=21.8, u=24.3, z=22.2	SDSS
199.0	139.8481	12.6407	R=23.3, g=23.9, i=22.2, u=23.6, z=21.7	SDSS
199.5	139.9613	12.6337	R=20.1, g=20.9, i=19.8, u=22.5, z=19.7	SDSS

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