Swift Trigger: 1299965;

Presumed name: GRB 250331B

BAT	04^h 45^m 31.44^s, +43° 48′ 18.0″
position:	(71.381, +43.805 ± 180″)
XRT	04^h 45^m 29.66^s, +43° 48′ 38.9″
position:	(71.3736, +43.8108 ± 1.9″)
UVOT	No position available.
Galactic N_HI:	5.12×10²¹ cm^-2
Galactic E(B-V):	0.907 mag

Best RA:	04^h 45^m 29.66^s	= 71.3736 d
Best Dec:	+43° 48′ 38.9″	= +43.8108 d

Gal Lat:	-1.13
Gal Long:	160.92

Sun angle:	67.11°, -4.1 hr East of Sun

Galaxies within 200 of XRT position

	RA*	Dec*		Catalogue
10.2	71.3767	43.8125		NED
12.2	71.3762	43.8081		NED
13.1	71.3696	43.8128		NED
21.9	71.3767	43.8053		NED
22.6	71.3769	43.8050	B2=20.5, I=17.8, R1=18.5, R2=18.4	USNO-B1
27.2	71.3838	43.8125		NED
45.6	71.3911	43.8102	I=18.5, R1=19.3, R2=19.3	USNO-B1
46.0	71.3767	43.7983		NED
46.0	71.3846	43.8008		NED
46.4	71.3912	43.8103		NED
46.5	71.3649	43.7995	B2=21.5, R1=18.9, R2=19.4	USNO-B1
46.6	71.3842	43.8003		NED
55.3	71.3904	43.8017		NED
55.6	71.3668	43.7962	I=17.8, R1=19.1, R2=19.2	USNO-B1
55.6	71.3667	43.7961		NED
56.5	71.3925	43.8033		NED
56.8	71.3908	43.8011		NED
57.8	71.3554	43.8017		NED
59.0	71.3549	43.8014	B1=20.1, B2=18.7, I=17.6, R1=18.0, R2=16.9	USNO-B1
59.6	71.3713	43.8272		NED
59.6	71.3912	43.8214		NED
60.9	71.3892	43.7983		NED
62.6	71.3950	43.8031		NED
63.3	71.3537	43.8006		NED
63.9	71.3958	43.8031		NED
68.4	71.3992	43.8064		NED
74.5	71.3883	43.7931		NED
74.6	71.3888	43.7931		NED
75.5	71.3446	43.8086		NED
76.0	71.3537	43.7953		NED
76.1	71.3538	43.7952	B2=20.6, I=18.3, R1=19.0, R2=18.8	USNO-B1
76.3	71.3900	43.7933		NED
76.9	71.3675	43.7900		NED
78.5	71.3446	43.8047		NED
79.0	71.3754	43.8328		NED
79.2	71.3991	43.7988	B1=17.8, B2=17.2, I=14.4, R1=15.2, R2=14.8	USNO-B1
79.3	71.3992	43.7989		NED
82.7	71.3458	43.7994		NED
82.9	71.3802	43.8333	B2=21.5, I=18.6, R1=19.7, R2=19.6	USNO-B1
84.2	71.3767	43.8342		NED
84.5	71.3825	43.7883		NED
85.7	71.3638	43.7881		NED
85.7	71.4054	43.8044		NED
86.2	71.3774	43.7870	B2=21.5, R2=19.5	USNO-B1
87.5	71.4000	43.8256		NED
87.7	71.4067	43.8158		NED
88.0	71.3408	43.8044		NED
88.5	71.3900	43.8322		NED
88.7	71.3900	43.8324	B1=18.8, B2=17.9, I=16.1, R1=16.7, R2=16.5	USNO-B1
89.5	71.3421	43.8008		NED
90.1	71.3979	43.7931		NED
90.6	71.3734	43.7856	R1=19.2, R2=18.1	USNO-B1
91.0	71.3729	43.8361		NED
92.3	71.3558	43.7886		NED
95.0	71.3380	43.8167	I=18.2, R2=18.5	USNO-B1
95.4	71.3975	43.8308		NED
96.3	71.3992	43.8300		NED
96.5	71.3992	43.8302	B2=20.6, I=17.7, R1=18.5, R2=18.4	USNO-B1
97.4	71.3942	43.8333		NED
97.4	71.3942	43.8334	B2=20.0, I=17.1, R1=18.1, R2=17.4	USNO-B1
98.6	71.3362	43.8167		NED
98.7	71.3450	43.7925		NED
99.4	71.3979	43.7894		NED
100.6	71.4013	43.7911		NED
102.2	71.3544	43.7860	I=13.4, R2=13.1	USNO-B1
102.2	71.3937	43.7864		NED
102.4	71.3904	43.8364		NED
102.8	71.3342	43.8089		NED
102.9	71.3958	43.7872		NED
103.6	71.4050	43.7931		NED
104.6	71.4121	43.8194		NED
105.2	71.3883	43.8381		NED
105.9	71.4133	43.8167		NED
106.3	71.3600	43.8386		NED
107.1	71.3601	43.8389	I=18.1, R2=20.5	USNO-B1
107.2	71.3829	43.7818	I=18.2, R2=19.5	USNO-B1
107.3	71.3979	43.7867	B1=19.2, R1=16.5, R2=19.5	USNO-B1
107.3	71.3796	43.7814		NED
107.9	71.3725	43.8408		NED
108.9	71.3492	43.8353		NED
109.3	71.4154	43.8133		NED
109.8	71.4090	43.8275	R1=19.8, R2=19.5	USNO-B1
110.2	71.3871	43.7817		NED
110.3	71.4112	43.8250		NED
110.3	71.3750	43.8414		NED
111.2	71.3308	43.8104	I=18.4, R2=19.1	USNO-B1
111.3	71.3971	43.8367		NED
111.4	71.4017	43.8342		NED
111.9	71.4023	43.8339	B1=19.8, I=16.0, R1=16.4	USNO-B1
112.4	71.4116	43.8257	B1=20.6, I=18.6, R2=20.0	USNO-B1
113.0	71.4046	43.8328		NED
113.1	71.4080	43.8300	I=18.8, R2=19.2	USNO-B1
113.1	71.4167	43.8075		NED
113.1	71.4169	43.8077	I=18.5, R2=19.9	USNO-B1
115.0	71.3304	43.8175		NED
115.8	71.3693	43.7788	B2=21.2, I=18.3, R1=19.4	USNO-B1
116.9	71.3987	43.7839		NED
117.5	71.4083	43.7900		NED
117.7	71.3642	43.7789		NED
120.2	71.3304	43.8228		NED
122.0	71.3746	43.7769		NED
122.2	71.3354	43.8308		NED
123.3	71.3521	43.7803		NED
123.3	71.3271	43.8044		NED
123.5	71.3904	43.8428		NED
123.8	71.3971	43.8406		NED
124.4	71.3379	43.8339		NED
124.5	71.4133	43.7914		NED
124.6	71.3692	43.8453		NED
124.6	71.3693	43.8453	B1=18.9, B2=18.1, I=16.4, R1=17.0, R2=16.8	USNO-B1
126.6	71.4150	43.8292		NED
128.9	71.4154	43.7917		NED
129.2	71.3379	43.7858		NED
129.3	71.3254	43.8014		NED
129.6	71.3254	43.8014		NED
129.7	71.3467	43.8411		NED
130.9	71.3967	43.7783		NED
131.0	71.4237	43.8136		NED
131.4	71.3233	43.8075		NED
132.0	71.4242	43.8139		NED
132.7	71.3229	43.8156		NED
132.7	71.4237	43.8172		NED
132.7	71.4125	43.8347		NED
132.8	71.4125	43.8347		NED
133.0	71.3571	43.8458		NED
133.0	71.3946	43.7772		NED
133.4	71.4137	43.8339		NED
134.1	71.4208	43.7956		NED
134.6	71.4250	43.8147		NED
134.6	71.3629	43.8475		NED
135.2	71.3742	43.8483		NED
135.4	71.4044	43.8412	B1=20.4, I=18.3	USNO-B1
135.5	71.4254	43.8078		NED
135.5	71.4256	43.8079	B1=20.1, B2=19.7, I=17.6, R1=18.3, R2=18.2	USNO-B1
135.9	71.3858	43.8475		NED
136.1	71.3858	43.8476	B1=17.8, B2=17.2, I=15.7, R1=16.2, R2=15.9	USNO-B1
137.2	71.4250	43.8017		NED
137.6	71.3333	43.8356		NED
137.7	71.3333	43.8357	I=17.0, R1=19.1, R2=18.3	USNO-B1
138.6	71.3929	43.7750		NED
139.0	71.3508	43.7758		NED
139.6	71.3667	43.8492		NED
140.2	71.3337	43.8372		NED
140.2	71.3705	43.8497	B1=17.7, R2=19.6	USNO-B1
140.5	71.4229	43.8269		NED
140.5	71.3342	43.8375		NED
140.9	71.4267	43.8036		NED
141.8	71.4275	43.8172		NED
141.9	71.4275	43.8174	B1=18.1, B2=17.3, I=15.2, R1=15.8, R2=15.5	USNO-B1
142.7	71.4121	43.8392		NED
142.7	71.3458	43.7767		NED
143.5	71.4142	43.8378		NED
143.7	71.4145	43.8377	B1=17.2, B2=16.9, I=15.2, R1=15.8, R2=15.4	USNO-B1
143.9	71.4192	43.7881		NED
144.1	71.4292	43.8111		NED
144.2	71.3179	43.8086		NED
144.2	71.3400	43.8425		NED
145.0	71.4271	43.7994		NED
145.3	71.4272	43.7993	B1=20.3, B2=20.0, I=17.6, R1=18.4, R2=18.1	USNO-B1
145.5	71.3454	43.8458		NED
146.3	71.3817	43.8511		NED
146.9	71.3758	43.8517		NED
147.0	71.3759	43.8516	B1=20.8, B2=20.0, I=17.6, R1=18.3, R2=17.8	USNO-B1
147.4	71.3722	43.8517	R1=20.1, R2=20.3	USNO-B1
148.6	71.3179	43.8017		NED
149.3	71.4242	43.8306		NED
149.4	71.3171	43.8032	I=18.4, R2=19.4	USNO-B1
149.5	71.3171	43.8033		NED
149.5	71.3158	43.8100		NED
150.5	71.4017	43.8472		NED
151.0	71.4308	43.8044		NED
151.6	71.4017	43.8478		NED
152.6	71.3221	43.8311		NED
153.0	71.3892	43.8517		NED
153.2	71.3893	43.8518	B1=16.5, B2=16.2, I=14.3, R1=15.0, R2=14.6	USNO-B1
153.5	71.3308	43.8403		NED
153.6	71.4096	43.7769		NED
154.9	71.3217	43.7897		NED
155.5	71.4030	43.8484	B1=20.1, B2=18.1, I=15.2, R1=16.7	USNO-B1
155.9	71.4225	43.7858		NED
155.9	71.4233	43.8350		NED
156.3	71.4033	43.8486		NED
156.8	71.3800	43.8542		NED
156.8	71.3625	43.8536		NED
157.2	71.3392	43.8467		NED
157.3	71.3179	43.8281		NED
158.0	71.4329	43.8011		NED
158.0	71.3937	43.8522		NED
158.4	71.3620	43.8540	B2=21.7, I=18.5, R1=19.6, R2=19.1	USNO-B1
158.5	71.3621	43.8542		NED
159.1	71.3561	43.8532	B1=21.0, B2=21.3, I=18.4, R1=19.4, R2=19.6	USNO-B1
160.6	71.4342	43.8197		NED
160.9	71.4342	43.8194		NED
161.0	71.4317	43.7950		NED
161.0	71.3554	43.8536		NED
161.2	71.4346	43.8191	B1=19.9, B2=20.0, I=17.4, R1=18.2, R2=17.3	USNO-B1
161.4	71.4356	43.8136	B1=20.0, R1=18.0	USNO-B1
163.9	71.4367	43.8139		NED
164.5	71.4333	43.7956		NED
164.7	71.3346	43.7747		NED
164.8	71.3203	43.7861	B1=20.6, I=15.8	USNO-B1
164.9	71.3117	43.8214		NED
165.7	71.3721	43.7648	I=18.4, R2=19.2	USNO-B1
165.8	71.3624	43.7655	B1=20.6, B2=20.0, I=17.4, R1=18.1, R2=17.9	USNO-B1
165.8	71.3354	43.7739		NED
165.8	71.3721	43.7647		NED
166.0	71.3625	43.7653		NED
166.4	71.3579	43.7658		NED
166.6	71.3313	43.8456		NED
166.7	71.3487	43.7681		NED
167.3	71.3104	43.8194		NED
167.5	71.4229	43.8408		NED
169.1	71.4379	43.8183		NED
169.9	71.4004	43.7678		NED
170.1	71.3500	43.7667	I=17.9, R2=20.1	USNO-B1
170.4	71.4092	43.8506		NED
170.6	71.3958	43.8553		NED
170.8	71.4386	43.8180	B2=21.0, R2=19.5	USNO-B1
171.1	71.3750	43.7633		NED
171.1	71.3888	43.8569		NED
171.1	71.3114	43.7951	I=18.5, R2=20.0	USNO-B1
171.2	71.3175	43.7858	I=17.3, R1=17.3, R2=16.7	USNO-B1
171.4	71.3258	43.7778		NED
171.7	71.3333	43.7731		NED
171.7	71.4171	43.8467		NED
172.7	71.3075	43.8050		NED
173.3	71.3400	43.7692		NED
173.4	71.4308	43.8356		NED
173.5	71.3833	43.8583		NED
173.6	71.3400	43.7692		NED
174.0	71.4271	43.7817		NED
174.7	71.3950	43.8569		NED
174.9	71.3275	43.8464		NED
174.9	71.3946	43.8569		NED
175.5	71.4375	43.7953		NED
175.6	71.4367	43.7936		NED
175.6	71.4392	43.8219		NED
175.9	71.3996	43.7658		NED
176.0	71.4371	43.7942		NED
176.0	71.4083	43.7689		NED
176.2	71.4350	43.7903		NED
176.6	71.4196	43.7747		NED
176.7	71.3079	43.7983		NED
177.4	71.4199	43.7746	B1=19.2, B2=17.8, I=16.1, R1=16.5, R2=16.8	USNO-B1
177.7	71.4112	43.8519		NED
177.7	71.3050	43.8086		NED
178.0	71.4382	43.7944	I=17.7, R1=19.1	USNO-B1
178.6	71.4400	43.7986		NED
179.0	71.4404	43.7986		NED
179.1	71.4261	43.8431	I=18.8, R1=19.6, R2=19.4	USNO-B1
179.1	71.3058	43.8011		NED
179.2	71.4216	43.8465	B2=21.3, R2=20.1	USNO-B1
179.4	71.3658	43.7614		NED
179.5	71.3204	43.8428		NED
180.1	71.3200	43.8428		NED
180.2	71.3967	43.8581		NED
180.4	71.4417	43.8017		NED
180.4	71.4233	43.8458		NED
180.8	71.4213	43.7742		NED
181.1	71.4096	43.8539		NED
181.2	71.4217	43.7744		NED
181.7	71.4196	43.8489		NED
181.7	71.3971	43.8583		NED
182.2	71.3950	43.7625		NED
182.5	71.3188	43.8425		NED
182.9	71.4433	43.8050		NED
183.2	71.4233	43.7750		NED
183.5	71.3034	43.8052	I=17.1, R1=18.6, R2=17.9	USNO-B1
183.7	71.3118	43.7861	I=17.8, R1=18.4	USNO-B1
183.7	71.4356	43.7863	B2=21.4, I=18.6, R1=19.3, R2=19.6	USNO-B1
183.9	71.3525	43.7619		NED
184.0	71.3329	43.8528		NED
184.0	71.3330	43.8527	B1=18.5, B2=17.9, I=16.0, R1=16.9, R2=16.4	USNO-B1
184.1	71.4188	43.7714		NED
184.3	71.3804	43.8617		NED
184.4	71.4292	43.8428		NED
184.6	71.3042	43.8219		NED
184.6	71.3030	43.8052	B1=20.9, B2=21.0, R1=18.1, R2=17.7	USNO-B1
184.6	71.3617	43.8614		NED
184.6	71.4442	43.8058		NED
184.7	71.4442	43.8061		NED
184.7	71.3029	43.8050		NED
184.7	71.3042	43.8225		NED
184.9	71.3046	43.8231		NED
185.0	71.4354	43.7853		NED
185.0	71.3619	43.8615	B1=16.1, B2=15.4, I=13.2, R1=13.9, R2=13.1	USNO-B1
185.2	71.3896	43.8608		NED
185.5	71.4017	43.8581		NED
185.6	71.3296	43.7703		NED
186.1	71.4446	43.8164		NED
186.4	71.4425	43.7964		NED
186.7	71.3421	43.8575		NED
187.6	71.4137	43.7675		NED
187.7	71.4236	43.7732	B1=20.7, I=18.4, R1=19.6, R2=19.5	USNO-B1
187.8	71.4145	43.7678	B2=18.6, I=16.2, R1=17.1, R2=16.3	USNO-B1
187.9	71.3096	43.8350		NED
188.3	71.3417	43.8578		NED
188.6	71.4154	43.7681		NED
188.6	71.3912	43.7600		NED
188.8	71.4146	43.7675		NED
189.4	71.4346	43.8394		NED
189.4	71.3379	43.7649	I=17.6, R2=18.7	USNO-B1
189.4	71.4083	43.8569		NED
189.6	71.3725	43.7581		NED
190.5	71.3282	43.7693	B2=20.1, I=17.3, R1=18.1, R2=17.7	USNO-B1
190.7	71.3000	43.8100		NED
190.8	71.3279	43.7692		NED
191.5	71.3246	43.7711		NED
191.7	71.4446	43.8256		NED
191.7	71.3629	43.8636		NED
191.9	71.3082	43.7861	I=18.1, R2=18.4	USNO-B1
192.2	71.3846	43.8636		NED
192.3	71.3212	43.8489		NED
192.5	71.3483	43.8611		NED
192.6	71.3215	43.8489	B1=20.4, B2=19.8, R1=18.5, R2=18.2	USNO-B1
192.6	71.3000	43.8169		NED
193.9	71.3296	43.8544		NED
194.0	71.3052	43.7892	R1=19.9, R2=19.7	USNO-B1
194.2	71.3647	43.7572	B2=21.7, R1=19.7, R2=19.9	USNO-B1
195.1	71.4412	43.8339		NED
195.2	71.4204	43.7686		NED
195.2	71.3592	43.8640	B2=21.2, R1=19.9, R2=19.6	USNO-B1
195.9	71.3300	43.7664		NED
196.1	71.4458	43.7956		NED
197.6	71.3675	43.8656		NED
199.1	71.3379	43.7619	I=18.2, R2=19.5	USNO-B1
199.1	71.4488	43.7997		NED
199.5	71.3879	43.7564		NED
199.8	71.2980	43.8211	B1=19.7, B2=18.6, I=16.7, R1=17.4, R2=17.0	USNO-B1
199.9	71.2979	43.8211		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