Swift Trigger: 1150429;

Presumed name: GRB 230123A

BAT	02^h 43^m 44.88^s, -65° 40′ 33.6″
position:	(40.937, -65.676 ± 180″)
XRT	02^h 43^m 25.99^s, -65° 41′ 12.5″
position:	(40.85828, -65.68680 ± 1.9″)
UVOT	No position available.
Galactic N_HI:	2.70×10²⁰ cm^-2
Galactic E(B-V):	0.028 mag

Best RA:	02^h 43^m 25.99^s	= 40.85828 d
Best Dec:	-65° 41′ 12.5″	= -65.68680 d

Gal Lat:	-47.65
Gal Long:	286.26

Sun angle:	74.63°, -6.4 hr East of Sun

Galaxies within 200 of XRT position

	RA*	Dec*		Catalogue
21.2	40.8675	-65.6914		NED
29.3	40.8388	-65.6856		NED
30.5	40.8779	-65.6889		NED
30.8	40.8654	-65.6789		NED
34.5	40.8417	-65.6936		NED
34.7	40.8708	-65.6950		NED
38.6	40.8592	-65.6975		NED
40.4	40.8321	-65.6836		NED
41.3	40.8421	-65.6775		NED
42.5	40.8863	-65.6892		NED
43.2	40.8642	-65.6750	B2=23.4, I=18.2	USNO-B1
43.5	40.8583	-65.6747		NED
44.9	40.8496	-65.6986		NED
45.1	40.8796	-65.6781		NED
47.3	40.8758	-65.6758		NED
52.9	40.8261	-65.6805	B=21.7, R2=20.8	SSS
57.8	40.8333	-65.6744		NED
60.5	40.8400	-65.6717		NED
62.0	40.8472	-65.7034	B2=25.0, I=18.4	USNO-B1
63.5	40.8225	-65.6967		NED
64.2	40.9008	-65.6903		NED
66.2	40.8137	-65.6881		NED
67.0	40.8263	-65.7000	Mag=19.7	NED
67.1	40.8189	-65.6960	B=21.8, R2=20.2	SSS
67.3	40.8188	-65.6960	B2=20.9, R2=20.7	USNO-B1
68.0	40.9038	-65.6889		NED
68.3	40.9041	-65.6887	B2=20.9, R1=19.6, R2=19.6	USNO-B1
69.1	40.8150	-65.6794		NED
69.3	40.8150	-65.6795	B2=20.3, I=18.8, R1=18.8, R2=18.9	USNO-B1
69.4	40.8817	-65.7036		NED
70.1	40.8988	-65.6969		NED
70.9	40.9029	-65.6800		NED
72.7	40.8792	-65.6686		NED
74.2	40.8288	-65.6703		NED
74.8	40.8900	-65.6706		NED
77.1	40.8395	-65.6668	B=21.4, R2=20.4	SSS
78.4	40.8396	-65.6664		NED
80.2	40.8846	-65.6675		NED
80.4	40.8929	-65.7039	Mag=18.6	NED
82.1	40.8963	-65.6703		NED
83.5	40.8783	-65.7083		NED
84.5	40.8771	-65.6647	Mag=20.2	NED
85.4	40.9079	-65.6989		NED
86.5	40.8628	-65.7107	B=21.9, R2=20.2	SSS
86.6	40.8625	-65.7108		NED
87.2	40.9150	-65.6933		NED
88.9	40.8529	-65.7114		NED
90.1	40.8001	-65.6796	B=21.9, R2=20.9	SSS
93.3	40.8025	-65.6989		NED
93.9	40.9121	-65.7006		NED
96.7	40.9183	-65.6972		NED
97.5	40.7972	-65.6767	B=22.4	SSS
101.6	40.8025	-65.6706		NED
102.3	40.8821	-65.6600		NED
105.4	40.8704	-65.6581		NED
106.4	40.9229	-65.6742		NED
106.7	40.7946	-65.6731		NED
107.2	40.8988	-65.6622		NED
109.3	40.7929	-65.6728		NED
110.3	40.7921	-65.6728		NED
111.6	40.9233	-65.7025		NED
112.0	40.8196	-65.7136		NED
112.8	40.9038	-65.7119		NED
113.0	40.7821	-65.6844		NED
113.3	40.7871	-65.6983	B=21.9, R2=20.0	SSS
113.8	40.7867	-65.6983	Mag=19.6	NED
113.9	40.7838	-65.6794		NED
114.1	40.8321	-65.7167		NED
114.5	40.7864	-65.6985	R1=19.5, R2=19.6	USNO-B1
114.7	40.9321	-65.6961		NED
115.0	40.8400	-65.6558		NED
115.1	40.8046	-65.6636		NED
116.0	40.9350	-65.6931	Mag=19.9	NED
116.1	40.9364	-65.6842	B=21.7, R2=20.8, i=18.7	SSS
116.4	40.9366	-65.6842	B2=20.9, R2=19.6	USNO-B1
116.7	40.8613	-65.6544		NED
116.8	40.9225	-65.7056		NED
117.2	40.9371	-65.6842		NED
118.0	40.9321	-65.6744		NED
120.3	40.9229	-65.6667		NED
120.9	40.7792	-65.6950		NED
121.9	40.9333	-65.7006		NED
123.4	40.8942	-65.6558	Mag=20.37	NED
123.5	40.8939	-65.6558	B=20.3, R2=18.9, i=18.2	SSS
124.7	40.8651	-65.6523	B2=21.1, I=18.8	USNO-B1
127.2	40.9008	-65.6561		NED
127.3	40.8615	-65.6515	B=22.0	SSS
127.8	40.9371	-65.6722		NED
129.5	40.7833	-65.6683		NED
131.5	40.8365	-65.6514	B=21.6, R2=19.5, i=18.3	SSS
131.8	40.8912	-65.7208		NED
131.8	40.8258	-65.6528		NED
131.9	40.8358	-65.6514		NED
132.5	40.8531	-65.6501	B2=17.1, I=15.2, R1=15.4, R2=15.5	USNO-B1
133.1	40.7808	-65.7056		NED
133.8	40.8513	-65.6497		NED
137.8	40.8500	-65.6486		NED
137.9	40.9513	-65.6872		NED
139.6	40.8092	-65.7200		NED
140.5	40.7638	-65.6842		NED
141.2	40.8700	-65.6478		NED
141.8	40.9278	-65.7139	B2=19.8, I=18.9, R1=18.5, R2=18.7	USNO-B1
141.9	40.9280	-65.7138	B=20.1, R2=19.0, i=18.4	SSS
142.1	40.9279	-65.7139	Mag=20.29	NED
144.2	40.7979	-65.7181		NED
144.5	40.9363	-65.7108		NED
145.5	40.8831	-65.6477	B=21.4, R2=20.6	SSS
146.0	40.8825	-65.6475		NED
146.5	40.7708	-65.6678		NED
146.9	40.7996	-65.6539		NED
146.9	40.7996	-65.6539	B=19.2, R2=17.8, i=17.1	SSS
147.1	40.9475	-65.7044		NED
147.7	40.9525	-65.6736		NED
148.2	40.9477	-65.6684	B=21.8	SSS
149.0	40.9167	-65.6531		NED
149.8	40.8925	-65.6478		NED
150.2	40.7946	-65.6542		NED
150.5	40.9596	-65.6861		NED
150.6	40.8413	-65.7281		NED
150.8	40.7942	-65.6542		NED
151.6	40.9292	-65.7172		NED
151.8	40.9600	-65.6819		NED
152.9	40.8604	-65.7292		NED
152.9	40.7996	-65.6517		NED
153.3	40.9079	-65.6494		NED
153.4	40.9113	-65.6502	B=22.4	SSS
154.5	40.9608	-65.6794		NED
154.6	40.7979	-65.7219		NED
154.7	40.9617	-65.6928	Mag=19.1	NED
155.5	40.7804	-65.6578		NED
156.1	40.9396	-65.6592		NED
156.3	40.9558	-65.6706		NED
156.8	40.7796	-65.6577	B2=20.8, I=17.3, R1=18.6	USNO-B1
156.8	40.9442	-65.6614		NED
157.6	40.8505	-65.6431	B=22.1	SSS
158.9	40.9321	-65.6547		NED
158.9	40.8567	-65.7308		NED
159.1	40.9271	-65.6531		NED
159.9	40.7817	-65.7181		NED
160.6	40.9213	-65.6506		NED
160.8	40.8212	-65.6447		NED
161.9	40.9562	-65.7067		NED
161.9	40.7533	-65.6994		NED
162.4	40.9215	-65.7237	B=22.2, R2=20.2	SSS
162.5	40.7492	-65.6824	I=19.2, R1=19.6, R2=20.4	USNO-B1
163.0	40.9217	-65.7239		NED
163.3	40.7488	-65.6822		NED
164.2	40.8217	-65.7297		NED
164.7	40.8642	-65.6411	B=22.0	SSS
165.4	40.7759	-65.6558	B2=14.1, I=12.3, R1=12.6, R2=12.7	USNO-B1
165.5	40.9367	-65.7194		NED
165.6	40.7758	-65.6558		NED
166.1	40.9692	-65.6928		NED
168.4	40.8654	-65.7336		NED
170.2	40.7458	-65.6772		NED
170.3	40.7450	-65.6947		NED
170.4	40.7838	-65.6508		NED
171.6	40.7762	-65.7206		NED
171.9	40.9437	-65.6546	B=22.0, R2=20.8	SSS
172.9	40.9438	-65.6542		NED
173.9	40.8462	-65.6386		NED
174.1	40.8442	-65.7347		NED
178.0	40.9156	-65.7302	B=20.7, R2=19.9	SSS
178.1	40.7417	-65.6744		NED
178.5	40.9161	-65.7303	B2=20.9, R1=19.5	USNO-B1
178.9	40.9638	-65.6628		NED
179.0	40.9279	-65.7275		NED
180.5	40.7688	-65.7208		NED
181.6	40.9154	-65.7314		NED
182.3	40.9558	-65.7175	Mag=20.6	NED
182.4	40.7363	-65.6800		NED
183.9	40.8617	-65.6358		NED
183.9	40.9671	-65.7114		NED
184.3	40.9700	-65.7092		NED
184.8	40.9708	-65.7090	B=22.0, R2=20.8	SSS
184.8	40.9225	-65.7308		NED
185.4	40.9413	-65.7253		NED
187.7	40.9479	-65.6500		NED
188.2	40.7613	-65.7206		NED
189.1	40.9071	-65.7353		NED
189.2	40.8687	-65.7392		NED
189.8	40.9835	-65.6978	B=19.4, R2=18.5, i=17.9	SSS
189.8	40.9836	-65.6978	B2=18.6, I=18.2, R1=18.3, R2=18.0	USNO-B1
189.9	40.9833	-65.6978	Mag=19.73	NED
190.1	40.8854	-65.6353	Mag=19.6	NED
190.2	40.8850	-65.6351	B=21.6, R2=19.8, i=18.8	SSS
190.2	40.7488	-65.6592		NED
192.1	40.7375	-65.6675		NED
192.3	40.9738	-65.6625		NED
192.9	40.9800	-65.7058		NED
193.6	40.9000	-65.7378		NED
193.8	40.9883	-65.6817		NED
193.9	40.7954	-65.6397		NED
194.0	40.8998	-65.7379	B2=17.0, I=15.3, R1=15.4, R2=15.3	USNO-B1
194.9	40.7587	-65.6514		NED
195.2	40.7275	-65.6933		NED
195.2	40.8846	-65.7400		NED
196.3	40.9654	-65.7186		NED
197.0	40.9358	-65.7311		NED
198.1	40.7783	-65.6428		NED
198.7	40.9471	-65.7283		NED
198.8	40.7488	-65.7189	Mag=20.03	NED
199.1	40.7487	-65.7188	B=19.9, R2=17.9, i=16.9	SSS
199.2	40.9408	-65.6431		NED
199.5	40.7487	-65.7190	B2=20.9, I=17.2, R2=17.0	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