Swift Trigger: 1294765;

Presumed name: GRB 250312A

BAT	01^h 58^m 02.40^s, -42° 24′ 14.4″
position:	(29.510, -42.404 ± 180″)
XRT	01^h 58^m 04.59^s, -42° 23′ 44.8″
position:	(29.51911, -42.39579 ± 1.9″)
UVOT	No position available.
Galactic N_HI:	1.70×10²⁰ cm^-2
Galactic E(B-V):	0.017 mag

Best RA:	01^h 58^m 04.59^s	= 29.51911 d
Best Dec:	-42° 23′ 44.8″	= -42.39579 d

Gal Lat:	-69.57
Gal Long:	265.59

Sun angle:	51.18°, -2.5 hr East of Sun

Galaxies within 200 of XRT position

	RA*	Dec*		Catalogue
10.0	29.5154	-42.3958		NED
19.7	29.5229	-42.3911		NED
27.3	29.5088	-42.3950		NED
29.1	29.5258	-42.3894	B=21.4, R2=19.5, i=18.4	SSS
29.5	29.5258	-42.3892		NED
33.4	29.5208	-42.3867		NED
37.9	29.5332	-42.3943	B2=21.4, I=18.6	USNO-B1
40.1	29.5137	-42.4062	B2=20.9, R2=24.1	USNO-B1
40.9	29.5138	-42.4064	Mag=19.2	NED
45.5	29.5200	-42.4083		NED
50.4	29.5375	-42.3922		NED
50.7	29.5225	-42.4097	R1=18.0, R2=25.0	USNO-B1
51.6	29.5004	-42.3997	Mag=19.3	NED
52.2	29.5259	-42.4094	B2=22.0, R1=19.8, R2=23.9	USNO-B1
53.1	29.5209	-42.4105	B2=21.3, R1=17.2, R2=24.7	USNO-B1
53.9	29.5152	-42.4105	B2=21.4, R1=16.0	USNO-B1
54.3	29.4996	-42.3911		NED
54.4	29.5013	-42.4032	B2=20.4, R2=24.3	USNO-B1
55.2	29.5116	-42.4101	B2=20.9, R2=24.8	USNO-B1
55.6	29.5011	-42.4036	B2=21.4, R2=24.1	USNO-B1
56.2	29.5042	-42.3844		NED
56.2	29.5046	-42.3844	B=22.0, R2=20.6	SSS
56.7	29.5110	-42.4104	B2=20.4, R2=24.2	USNO-B1
60.4	29.5084	-42.4106	B2=20.3, R1=20.0	USNO-B1
68.7	29.4933	-42.3983		NED
69.1	29.5217	-42.3767	B2=22.0, R1=20.6	USNO-B1
69.9	29.5017	-42.4103		NED
71.3	29.5442	-42.4022		NED
71.5	29.4954	-42.3861		NED
73.9	29.5359	-42.4121	R1=18.7, R2=25.0	USNO-B1
74.5	29.5388	-42.4106		NED
76.2	29.5058	-42.3769		NED
78.6	29.4968	-42.4101	I=18.0, R1=19.5	USNO-B1
78.6	29.5208	-42.4175		NED
80.3	29.4904	-42.3883		NED
80.6	29.5333	-42.3761		NED
82.3	29.5496	-42.3925		NED
82.6	29.5083	-42.3744		NED
83.5	29.5287	-42.4178		NED
83.9	29.5279	-42.3733		NED
84.3	29.5002	-42.4146	B2=20.5, R1=20.6	USNO-B1
84.5	29.5277	-42.4184	B2=21.7, R2=25.0	USNO-B1
85.6	29.5017	-42.4158	B2=21.4, R1=20.5	USNO-B1
85.9	29.5277	-42.3728	R1=20.6, R2=24.1	USNO-B1
86.0	29.5282	-42.3729	B=22.0, R2=20.2	SSS
86.4	29.4931	-42.4101	B2=21.1, R2=24.4	USNO-B1
86.6	29.5121	-42.4194		NED
90.1	29.5379	-42.3750		NED
91.0	29.5525	-42.4006		NED
91.8	29.5492	-42.4083		NED
93.7	29.5542	-42.3981		NED
96.0	29.4892	-42.3808		NED
96.6	29.4946	-42.3758		NED
98.9	29.5425	-42.4169		NED
99.7	29.5258	-42.4230	B2=21.3, R2=25.0	USNO-B1
100.0	29.5332	-42.4215	I=18.7, R1=20.3	USNO-B1
100.0	29.5446	-42.3754	B=19.8, R2=18.9, i=18.8	SSS
100.4	29.5329	-42.4217	Mag=20.37	NED
100.4	29.5330	-42.4217	B2=21.5, I=18.6, R1=24.6, R2=21.1	USNO-B1
100.5	29.5331	-42.4217	B=20.6, R2=19.7	SSS
100.6	29.5446	-42.3753	Mag=19.69	NED
100.7	29.5033	-42.4211		NED
101.7	29.4837	-42.3847		NED
101.9	29.4839	-42.3846	B=21.3, R2=20.3	SSS
102.4	29.5029	-42.4217		NED
103.3	29.5579	-42.3933		NED
103.6	29.4812	-42.3894		NED
105.6	29.5451	-42.4180	B=22.4, R2=20.9	SSS
106.5	29.4848	-42.3805	B2=21.8, R1=20.6	USNO-B1
107.7	29.5567	-42.4072		NED
109.3	29.4908	-42.3736		NED
109.5	29.4910	-42.3736	B=22.0, R2=20.8, i=18.9	SSS
110.3	29.5533	-42.3786		NED
110.7	29.5485	-42.3740	B2=21.4, R1=20.5	USNO-B1
111.1	29.5021	-42.3675		NED
111.9	29.5492	-42.3741	B=22.3	SSS
112.2	29.4988	-42.4231		NED
113.0	29.5015	-42.3672	B2=21.4, R1=20.6	USNO-B1
113.8	29.5613	-42.4014		NED
115.0	29.5317	-42.4264		NED
115.7	29.5196	-42.3636		NED
115.9	29.4871	-42.4178		NED
117.9	29.5463	-42.4217		NED
118.1	29.4882	-42.4194	B2=22.3, R1=20.4, R2=25.0	USNO-B1
119.9	29.5130	-42.3628	B2=22.1, R1=20.3	USNO-B1
122.8	29.5417	-42.4256		NED
123.2	29.5338	-42.3633		NED
124.3	29.5304	-42.4292		NED
126.7	29.5608	-42.3786		NED
127.0	29.4737	-42.4075		NED
127.6	29.5533	-42.4206		NED
128.0	29.5645	-42.4077	I=18.6, R2=24.3	USNO-B1
129.4	29.5646	-42.4081		NED
129.8	29.5471	-42.3664		NED
130.6	29.5025	-42.3617		NED
131.1	29.5025	-42.3615	B2=21.3, R2=25.0	USNO-B1
131.6	29.5054	-42.4308		NED
132.1	29.4822	-42.3712	B2=22.0, I=18.7	USNO-B1
132.5	29.5034	-42.3609	B2=21.4, R2=20.5	USNO-B1
132.8	29.4828	-42.3705	B=20.0, R2=18.8, i=18.3	SSS
133.1	29.4825	-42.3703	Mag=19.86	NED
133.2	29.5158	-42.3589		NED
133.7	29.5538	-42.4228	Mag=18.5	NED
135.2	29.5696	-42.4000		NED
135.8	29.5539	-42.4234	I=18.0, R1=19.6	USNO-B1
137.1	29.4779	-42.4186		NED
137.9	29.5042	-42.3592		NED
138.0	29.5525	-42.3664		NED
139.2	29.5108	-42.3575		NED
139.7	29.4666	-42.3972	B2=21.9, I=18.7, R2=20.5	USNO-B1
139.9	29.4665	-42.3977	B2=22.4, I=18.7, R1=24.3, R2=24.1	USNO-B1
140.2	29.4663	-42.3978		NED
140.3	29.4664	-42.3978	B=22.2, R2=19.9	SSS
141.8	29.4658	-42.3933		NED
141.9	29.4671	-42.3869	Mag=20.09	NED
141.9	29.4658	-42.3934	B=21.3, R2=19.4, i=18.5	SSS
142.6	29.4679	-42.3836		NED
142.6	29.4668	-42.3870	B=20.2, R2=18.2, i=17.7	SSS
142.7	29.4687	-42.4094	I=18.8, R1=20.5	USNO-B1
143.5	29.5679	-42.4125	Mag=18.1	NED
143.5	29.5425	-42.3600		NED
143.6	29.5209	-42.3559	B2=21.4, I=17.7, R1=20.6	USNO-B1
143.8	29.4658	-42.3892		NED
144.2	29.5250	-42.4356		NED
145.1	29.5642	-42.3731		NED
146.2	29.5739	-42.3921	B2=20.6, I=17.9	USNO-B1
146.8	29.4816	-42.3658	R1=20.6, R2=24.7	USNO-B1
148.7	29.5733	-42.3856		NED
149.0	29.5178	-42.4372	B2=20.7, R1=20.6	USNO-B1
149.0	29.4629	-42.3961		NED
149.0	29.4750	-42.3700		NED
149.9	29.5063	-42.4364		NED
150.2	29.5063	-42.4364	B2=21.4, R1=20.6, R2=23.1	USNO-B1
150.6	29.4771	-42.3678		NED
151.1	29.5242	-42.3539		NED
151.2	29.5738	-42.4075		NED
151.7	29.4983	-42.4350		NED
152.3	29.5282	-42.3540	R1=20.5, R2=24.1	USNO-B1
152.6	29.4729	-42.4208		NED
154.0	29.4617	-42.3892		NED
154.2	29.5279	-42.3533		NED
155.3	29.5371	-42.4367		NED
156.1	29.5400	-42.4364		NED
157.4	29.5341	-42.4381	B=21.6, R2=19.4	SSS
157.9	29.5334	-42.4384	B2=21.4, R1=14.6	USNO-B1
160.0	29.5650	-42.3669		NED
161.7	29.5742	-42.4147		NED
162.3	29.4609	-42.4094	B=21.5, R2=21.5	SSS
162.7	29.4608	-42.4097		NED
163.9	29.5021	-42.4394		NED
164.2	29.5800	-42.4036	Mag=19.7	NED
164.2	29.5179	-42.3503		NED
165.7	29.5174	-42.3498	R1=17.7, R2=25.0	USNO-B1
166.1	29.4892	-42.4364		NED
166.4	29.5525	-42.3567		NED
167.0	29.5604	-42.3608		NED
168.4	29.5667	-42.4264		NED
170.1	29.5200	-42.4431		NED
171.1	29.5339	-42.4421	I=18.5, R1=20.6, R2=25.0	USNO-B1
171.6	29.5115	-42.3484	B=21.4	SSS
171.9	29.5116	-42.3484	B2=21.3, R1=20.3, R2=24.3	USNO-B1
172.2	29.4768	-42.3596	B=22.4	SSS
172.7	29.5111	-42.3482	B2=21.4, I=18.7, R1=20.1	USNO-B1
172.7	29.4550	-42.3886		NED
172.8	29.5071	-42.4431		NED
173.2	29.5254	-42.3478		NED
173.5	29.5688	-42.3644		NED
173.6	29.5252	-42.3478	B=22.0	SSS
173.6	29.5333	-42.4428		NED
174.3	29.4537	-42.3994		NED
174.8	29.4558	-42.4097		NED
174.9	29.5444	-42.3509	B=20.2, R2=18.9, i=18.4	SSS
175.2	29.5442	-42.3508	Mag=20.05	NED
175.8	29.5592	-42.4344		NED
176.2	29.5279	-42.4442		NED
176.2	29.5604	-42.3575		NED
176.9	29.4654	-42.4247	Mag=19.81	NED
177.0	29.4653	-42.4247	B=20.0, R2=18.4, i=17.9	SSS
177.2	29.5796	-42.3750	R1=20.1, R2=23.6	USNO-B1
177.7	29.5117	-42.3467		NED
178.2	29.5804	-42.3761		NED
179.7	29.5283	-42.3464		NED
180.5	29.5867	-42.3922	Mag=19.1	NED
180.5	29.5868	-42.3923	B=21.2, R2=19.4, i=18.6	SSS
180.6	29.5291	-42.3462	B2=21.3, I=18.7	USNO-B1
180.9	29.5499	-42.4406	B=22.1	SSS
181.3	29.5819	-42.3761	B2=21.8, I=18.7	USNO-B1
181.6	29.4508	-42.3953		NED
182.0	29.4507	-42.3955	B=21.4, R2=19.8, i=19.2	SSS
182.5	29.4837	-42.4392	B=21.9	SSS
183.7	29.4504	-42.3900		NED
184.0	29.5493	-42.4418	B=20.3	SSS
184.4	29.5050	-42.3456		NED
184.6	29.5052	-42.3456	B=22.2	SSS
184.8	29.5354	-42.3458		NED
184.9	29.4850	-42.4406		NED
185.0	29.4600	-42.3687	B=21.0, R2=19.0, i=18.5	SSS
185.4	29.4600	-42.3686	Mag=18.8	NED
185.7	29.4606	-42.3677	I=18.3, R1=20.6	USNO-B1
186.2	29.4971	-42.4450		NED
187.7	29.4675	-42.4314		NED
187.9	29.5008	-42.4461		NED
188.0	29.4925	-42.4442	R1=20.5, R2=24.7	USNO-B1
188.2	29.4885	-42.3486	R1=20.2, R2=24.8	USNO-B1
189.3	29.4608	-42.3653		NED
189.5	29.4898	-42.4438	B=20.2, R2=18.7, i=18.1	SSS
189.6	29.4896	-42.4439	Mag=20.20	NED
189.6	29.4713	-42.4347	Mag=19.0	NED
190.0	29.4608	-42.3653	B=21.7, R2=20.4	SSS
190.1	29.5846	-42.4172		NED
192.5	29.5563	-42.4417	I=18.8, R1=20.0	USNO-B1
193.0	29.4667	-42.3586		NED
193.0	29.5217	-42.3422		NED
193.2	29.4793	-42.4407	B=22.3, R2=21.6	SSS
193.4	29.5117	-42.4492		NED
194.0	29.5663	-42.3547		NED
194.1	29.4792	-42.4408		NED
194.5	29.5563	-42.4422		NED
194.5	29.4468	-42.3874	B2=22.2, I=18.1	USNO-B1
194.6	29.5665	-42.3546	R1=24.6, R2=24.4	USNO-B1
194.6	29.5254	-42.4497		NED
194.6	29.5875	-42.3764		NED
195.2	29.4467	-42.3870	B=21.7, R2=19.6, i=18.6	SSS
195.2	29.4467	-42.3869		NED
197.3	29.5004	-42.3428		NED
197.5	29.5913	-42.3828	B2=20.7, I=18.7	USNO-B1
197.5	29.5933	-42.3947		NED
197.6	29.4512	-42.4181	B2=22.0, R2=24.0	USNO-B1
197.8	29.4475	-42.4114		NED
198.0	29.5929	-42.4022		NED
198.6	29.4472	-42.4108	B2=22.3, R2=20.5	USNO-B1
199.0	29.4529	-42.4219		NED
199.2	29.5679	-42.4378		NED
199.6	29.4988	-42.3424	B=22.1, R2=20.6	SSS
199.7	29.4444	-42.3902	B2=20.7, I=18.3, R2=20.5	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