Swift Trigger: 1156572;

Presumed name: GRB 230228A

BAT	01^h 13^m 36.72^s, +44° 29′ 20.4″
position:	(18.403, 44.489 ± 180″)
XRT	01^h 13^m 30.78^s, +44° 28′ 58.5″
position:	(18.37824, 44.48293 ± 1.9″)
UVOT	No position available.
Galactic N_HI:	7.56×10²⁰ cm^-2
Galactic E(B-V):	0.078 mag

Best RA:	01^h 13^m 30.78^s	= 18.37824 d
Best Dec:	+44° 28′ 58.5″	= 44.48293 d

Gal Lat:	-18.21
Gal Long:	127.07

Sun angle:	62.70°, -2.5 hr East of Sun

Galaxies within 200 of XRT position

	RA*	Dec*		Catalogue
15.1	18.3792	44.4869		NED
26.1	18.3825	44.4764		NED
27.1	18.3758	44.4756		NED
27.4	18.3821	44.4758		NED
28.4	18.3817	44.4756		NED
31.0	18.3789	44.4743	B2=20.6, R1=18.2, R2=18.6	USNO-B1
32.7	18.3679	44.4881		NED
32.7	18.3745	44.4742	B1=13.4, B2=12.6, I=11.1, R1=11.4, R2=11.8	USNO-B1
33.9	18.3742	44.4739		NED
36.6	18.3900	44.4772		NED
43.6	18.3938	44.4881		NED
45.2	18.3613	44.4792		NED
45.2	18.3604	44.4839		NED
48.2	18.3858	44.4707	B2=20.5, R2=19.1	USNO-B1
48.4	18.3858	44.4706		NED
52.5	18.3973	44.4881	B2=22.0, R1=19.5, R2=19.0	USNO-B1
53.5	18.3850	44.4969		NED
59.3	18.3908	44.4691	B2=21.9, R1=19.7	USNO-B1
59.6	18.3883	44.4978		NED
59.8	18.3958	44.4936		NED
60.4	18.3546	44.4839		NED
60.9	18.3560	44.4771	B1=18.5, B2=18.2, I=15.8, R1=16.4, R2=16.6	USNO-B1
60.9	18.3558	44.4769		NED
61.0	18.3627	44.4957	B2=20.9, R1=19.2, R2=19.1	USNO-B1
61.9	18.3575	44.4742		NED
62.2	18.3625	44.4961		NED
64.2	18.4004	44.4750		NED
64.2	18.4025	44.4867		NED
68.2	18.3550	44.4922		NED
69.2	18.4042	44.4778		NED
71.3	18.3508	44.4792		NED
71.6	18.3945	44.4668	B1=18.8, B2=18.6, I=15.8, R1=16.6, R2=16.9	USNO-B1
71.6	18.4013	44.4939		NED
71.8	18.3946	44.4667		NED
71.9	18.3542	44.4725		NED
72.1	18.3996	44.4700		NED
82.2	18.4071	44.4733		NED
83.4	18.3463	44.4872		NED
84.1	18.3696	44.5055	B=21.1, R=19.9	APM-N
84.1	18.3696	44.5056		NED
84.5	18.3808	44.5064		NED
85.6	18.3471	44.4744		NED
89.3	18.4029	44.4653		NED
89.5	18.3842	44.5075		NED
90.4	18.3613	44.4608		NED
90.8	18.4133	44.4856		NED
91.2	18.3463	44.4717		NED
91.7	18.3852	44.4579	I=19.8, R2=19.2	USNO-B1
92.1	18.3425	44.4792		NED
92.6	18.3442	44.4747		NED
92.8	18.3858	44.4578		NED
93.2	18.3607	44.4603	B2=22.1, R2=19.2	USNO-B1
94.7	18.3758	44.4567		NED
95.9	18.3410	44.4815	R1=19.3, R2=19.1	USNO-B1
96.0	18.3433	44.4922		NED
96.2	18.3500	44.4653		NED
96.3	18.3408	44.4817		NED
96.6	18.3971	44.5061		NED
98.5	18.3400	44.4861		NED
100.3	18.4079	44.4647		NED
101.9	18.4104	44.4994		NED
102.3	18.4038	44.4611		NED
103.1	18.3704	44.5111		NED
104.9	18.4154	44.4711		NED
106.0	18.3500	44.4614		NED
107.5	18.4004	44.4575		NED
107.9	18.3388	44.4728		NED
111.4	18.3450	44.5028		NED
113.5	18.4108	44.5042		NED
114.3	18.3588	44.5117		NED
114.8	18.3350	44.4747		NED
115.3	18.4075	44.5072		NED
115.4	18.3675	44.4519		NED
116.8	18.4229	44.4881		NED
119.0	18.3342	44.4933		NED
119.2	18.3804	44.4497		NED
119.3	18.3354	44.4961		NED
119.5	18.3355	44.4960	B1=21.1, B2=21.1, I=19.4, R1=18.8, R2=18.7	USNO-B1
119.8	18.3317	44.4817		NED
121.9	18.4229	44.4719		NED
124.1	18.4167	44.4622		NED
124.3	18.3617	44.4506		NED
124.9	18.3687	44.5169		NED
125.9	18.4266	44.4775	B2=21.2, I=18.0, R1=18.3, R2=18.3	USNO-B1
126.2	18.4267	44.4775		NED
126.2	18.4268	44.4775	B=21.7, R=19.3	APM-N
126.3	18.3655	44.5168	B1=21.2, B2=21.1	USNO-B1
126.8	18.3596	44.5156		NED
127.0	18.3346	44.4994		NED
129.1	18.3788	44.5189		NED
129.1	18.3842	44.5186		NED
129.3	18.3663	44.5178		NED
129.7	18.3288	44.4906		NED
129.7	18.3417	44.5081		NED
130.1	18.3358	44.5028		NED
131.0	18.3725	44.5192		NED
131.7	18.3728	44.5193	I=19.7, R1=18.9, R2=20.9	USNO-B1
133.5	18.3975	44.4483		NED
134.3	18.4288	44.4731		NED
134.6	18.3329	44.5017		NED
134.9	18.3328	44.5018	B1=20.7, B2=20.8, I=17.6, R1=18.2, R2=18.4	USNO-B1
135.1	18.3267	44.4750		NED
135.2	18.3563	44.4489		NED
137.6	18.3954	44.5192		NED
139.3	18.3600	44.4464		NED
139.3	18.3637	44.5203		NED
139.5	18.3334	44.4611	B2=20.9, R2=18.9	USNO-B1
139.8	18.3333	44.4608		NED
140.6	18.3488	44.5158		NED
140.7	18.3235	44.4818	B2=21.6, I=19.8	USNO-B1
141.0	18.3233	44.4819		NED
141.3	18.3746	44.5222		NED
141.4	18.3496	44.4494		NED
141.7	18.3696	44.5219		NED
142.0	18.4317	44.4728		NED
144.1	18.3626	44.5214	B1=21.2, I=19.7, R2=21.2	USNO-B1
144.2	18.3417	44.4525		NED
144.9	18.3929	44.5219		NED
145.1	18.3813	44.4428		NED
145.2	18.4312	44.4964		NED
145.4	18.4316	44.4965	B=19.8, R=18.8	APM-N
146.6	18.4038	44.5194		NED
146.9	18.4083	44.4483		NED
147.7	18.4358	44.4842		NED
148.0	18.3592	44.4442		NED
149.1	18.4238	44.4572		NED
149.2	18.4237	44.4572	B=17.9, R=16.3	APM-N
149.9	18.4238	44.4569		NED
150.7	18.3925	44.4422		NED
150.7	18.3200	44.4786		NED
150.8	18.3198	44.4789	I=17.8, R2=20.8	USNO-B1
151.1	18.4300	44.4631		NED
152.1	18.3367	44.5131		NED
152.1	18.4306	44.4632	B1=15.5, B2=15.2, I=13.2, R1=14.4, R2=14.2	USNO-B1
152.3	18.3221	44.4969		NED
152.8	18.3192	44.4872		NED
153.0	18.4029	44.4442		NED
153.1	18.3279	44.5058		NED
153.1	18.4304	44.5036		NED
153.6	18.3278	44.5058	R1=19.1, R2=19.1	USNO-B1
154.7	18.3438	44.4478		NED
155.5	18.4383	44.4886		NED
155.8	18.3517	44.4442		NED
156.2	18.3742	44.4397		NED
156.2	18.4385	44.4890	B=19.4, R=18.6	APM-N
156.5	18.3879	44.5258		NED
156.8	18.3879	44.5259	B=21.0, R=18.1	APM-N
156.9	18.4267	44.4564		NED
157.3	18.4264	44.4559	B=21.6, R=20.0	APM-N
158.6	18.3296	44.4558	B2=21.3, I=19.4, R2=20.4	USNO-B1
159.2	18.3308	44.5117		NED
159.6	18.4383	44.4717		NED
160.0	18.3288	44.4558		NED
160.0	18.3642	44.4397		NED
160.1	18.3200	44.4986		NED
160.3	18.3541	44.5240	B1=15.5, B2=15.1, I=13.2, R1=14.3, R2=14.2	USNO-B1
160.4	18.3542	44.5239		NED
160.7	18.3198	44.4990	B=14.9, R=13.5	APM-N
160.8	18.3542	44.5242		NED
162.8	18.3579	44.5258		NED
163.5	18.3305	44.4529	B2=21.2, R2=19.2	USNO-B1
164.0	18.4058	44.5242		NED
164.1	18.3167	44.4953		NED
164.3	18.3157	44.4734	B2=21.7, R2=21.1	USNO-B1
164.4	18.3166	44.4953	B2=21.2, I=18.4, R1=19.1, R2=19.1	USNO-B1
164.5	18.3513	44.5244		NED
164.6	18.3192	44.5008		NED
165.7	18.3979	44.4392		NED
165.7	18.3171	44.4683		NED
166.0	18.3191	44.5015	I=18.1, R1=18.1	USNO-B1
166.5	18.3192	44.5019		NED
166.9	18.4379	44.5011		NED
167.4	18.3221	44.5069		NED
167.5	18.4167	44.5203		NED
167.6	18.4408	44.4956		NED
168.1	18.3129	44.4803		NED
169.5	18.3303	44.4505	B2=20.5, R2=19.2	USNO-B1
169.6	18.4425	44.4731		NED
169.7	18.4054	44.4400		NED
169.8	18.3352	44.4471	B2=16.8, I=16.9, R2=18.0	USNO-B1
170.4	18.3546	44.4386		NED
171.1	18.3459	44.4414	B1=21.1, I=18.3, R1=19.1, R2=18.8	USNO-B1
171.8	18.4117	44.4417		NED
172.4	18.3779	44.5308		NED
172.6	18.4446	44.4750		NED
172.6	18.3442	44.4417		NED
172.7	18.3608	44.5292		NED
172.7	18.3696	44.4353		NED
172.8	18.3440	44.4416	B2=19.5, R2=17.9	USNO-B1
172.9	18.3607	44.5293	B2=21.0, I=18.6, R2=19.0	USNO-B1
173.1	18.3309	44.4487	B2=18.1, R2=17.7	USNO-B1
173.4	18.3448	44.4411	B1=21.2, B2=20.6, I=19.5, R2=18.5	USNO-B1
173.5	18.3311	44.4484	B1=20.4, B2=17.6, R2=19.3	USNO-B1
173.6	18.3443	44.4413	B2=19.7, R2=18.3	USNO-B1
173.9	18.3439	44.4413	B1=20.7, B2=20.2, R2=18.1	USNO-B1
174.0	18.3883	44.4353		NED
174.2	18.3338	44.5194		NED
174.4	18.4442	44.4717		NED
174.5	18.3733	44.5314		NED
175.9	18.4325	44.5125		NED
176.2	18.4458	44.4758		NED
176.3	18.3303	44.4479	B2=18.1, R2=17.4	USNO-B1
176.3	18.4462	44.4759	B=16.2, R=15.2	APM-N
176.5	18.4221	44.5208		NED
177.3	18.4167	44.4419		NED
178.3	18.3663	44.5317		NED
179.5	18.3096	44.4928		NED
180.5	18.4033	44.5297		NED
181.0	18.3329	44.5214	B2=21.2, R2=19.1	USNO-B1
181.9	18.3331	44.5219	I=18.6, R2=19.0	USNO-B1
182.1	18.3342	44.5225		NED
182.2	18.3382	44.4411	B2=15.7, I=19.0, R1=15.7	USNO-B1
182.4	18.3079	44.4894		NED
182.5	18.4083	44.4370	B=18.9, R=17.6	APM-N
182.8	18.4492	44.4847		NED
183.4	18.4496	44.4817	I=17.7, R2=15.7	USNO-B1
183.6	18.4496	44.4811		NED
183.7	18.4408	44.4586		NED
184.0	18.3846	44.5339		NED
184.1	18.3632	44.4329	B=18.3, R=18.0	APM-N
184.1	18.4500	44.4822		NED
184.3	18.4071	44.4361		NED
184.3	18.3629	44.4328		NED
184.4	18.4438	44.4619		NED
184.4	18.4500	44.4858		NED
184.5	18.3442	44.5281		NED
184.6	18.4200	44.5247		NED
184.9	18.3065	44.4873	I=19.8, R2=21.2	USNO-B1
185.3	18.3063	44.4875		NED
185.9	18.3513	44.5308		NED
187.5	18.3283	44.4450		NED
187.9	18.4483	44.4681		NED
187.9	18.3879	44.4311		NED
188.6	18.3231	44.4483	B2=19.0, R2=19.3	USNO-B1
188.7	18.3448	44.4362	B2=20.9, R2=20.2	USNO-B1
189.1	18.4483	44.4986		NED
189.7	18.3436	44.4364	B2=20.9, R2=20.2	USNO-B1
190.3	18.3579	44.5336		NED
190.6	18.3213	44.5169		NED
191.5	18.3071	44.4670	I=19.7, R2=18.7	USNO-B1
191.6	18.4447	44.4588	I=18.6, R1=19.2, R2=19.1	USNO-B1
192.1	18.4346	44.4481		NED
192.1	18.3058	44.4967		NED
192.5	18.4450	44.4586		NED
193.0	18.4358	44.5175		NED
193.1	18.3729	44.5364		NED
193.1	18.3308	44.4414		NED
193.1	18.3396	44.5292		NED
193.1	18.3304	44.4414		NED
193.3	18.4267	44.5239		NED
193.5	18.3397	44.4367	B2=18.4, I=19.4	USNO-B1
194.1	18.3075	44.4639		NED
194.4	18.3055	44.4681	B=21.7, R=19.4	APM-N
194.7	18.3223	44.4464	B2=18.8, R2=19.4	USNO-B1
194.9	18.3021	44.4831		NED
195.0	18.3050	44.4681		NED
195.1	18.4229	44.5267		NED
195.4	18.4413	44.5131		NED
197.0	18.3079	44.5050		NED
197.8	18.3995	44.4301	I=17.4, R2=16.4	USNO-B1
198.0	18.3992	44.4300		NED
199.2	18.3354	44.5292		NED
199.4	18.4554	44.4783		NED
199.8	18.3353	44.5292	B1=21.1, R1=18.9, R2=20.6	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