Swift Trigger: 1186032;

Presumed name: GRB 230818A

BAT	19^h 03^m 31.92^s, +40° 52′ 33.6″
position:	(285.883, 40.876 ± 180″)
XRT	19^h 03^m 33.48^s, +40° 53′ 43.0″
position:	(285.88951, 40.89528 ± 3.7″)
UVOT	No position available.
Galactic N_HI:	7.88×10²⁰ cm^-2
Galactic E(B-V):	0.121 mag

Best RA:	19^h 03^m 33.48^s	= 285.88951 d
Best Dec:	+40° 53′ 43.0″	= 40.89528 d

Gal Lat:	15.25
Gal Long:	71.45

Sun angle:	113.66°, -9.2 hr East of Sun

Galaxies within 200 of XRT position

	RA*	Dec*		Catalogue
10.1	285.8904	40.8925		NED
12.1	285.8850	40.8947		NED
12.3	285.8930	40.8974	B1=20.9, B2=20.7, R1=19.3, R2=19.4	USNO-B1
12.9	285.8892	40.8989		NED
13.1	285.8846	40.8947		NED
17.2	285.8958	40.8944		NED
23.3	285.8958	40.8911		NED
24.2	285.8983	40.8953		NED
26.9	285.8821	40.9003		NED
27.8	285.8796	40.8931		NED
32.4	285.8858	40.8867		NED
32.5	285.8878	40.8864	I=18.4, R2=19.9	USNO-B1
35.7	285.9011	40.8999	B2=20.6, I=18.6, R2=19.8	USNO-B1
36.2	285.9013	40.9000		NED
37.0	285.9008	40.8897		NED
37.4	285.9010	40.8896	B1=20.7, B2=20.9, I=17.8, R1=18.7, R2=18.6	USNO-B1
37.4	285.8760	40.8970	B1=21.2, B2=20.9	USNO-B1
37.6	285.8800	40.8878		NED
38.8	285.8775	40.9011		NED
38.8	285.8996	40.8878		NED
42.7	285.8855	40.8838	B2=20.8, R2=19.9	USNO-B1
45.5	285.9062	40.8947		NED
46.0	285.8896	40.8825		NED
47.5	285.8746	40.9019		NED
47.8	285.8744	40.9021	B1=19.9, B2=19.6, I=17.8, R1=17.9, R2=18.0	USNO-B1
48.9	285.8718	40.8975	B1=17.0, B2=17.2, I=14.9, R1=15.3, R2=15.6	USNO-B1
48.9	285.8717	40.8975		NED
50.9	285.8708	40.8958		NED
52.1	285.9083	40.8928		NED
52.7	285.9079	40.8992		NED
54.0	285.9078	40.9011	I=18.3, R2=19.9	USNO-B1
58.7	285.8700	40.9028		NED
60.6	285.9092	40.9033		NED
60.9	285.8933	40.9119		NED
62.4	285.8738	40.9081		NED
66.0	285.9129	40.8903		NED
68.0	285.8775	40.8786		NED
68.1	285.8663	40.9025		NED
68.8	285.9071	40.8814		NED
72.5	285.9133	40.9042		NED
73.5	285.9150	40.9014		NED
73.7	285.8625	40.8956		NED
74.0	285.8973	40.8756	B1=21.1, B2=20.9, I=17.3, R1=18.5, R2=18.4	USNO-B1
74.2	285.8833	40.8753		NED
74.3	285.8971	40.8756		NED
74.6	285.8692	40.8814		NED
75.7	285.8647	40.9047	B2=20.9, R2=19.9	USNO-B1
75.8	285.8875	40.9164		NED
78.7	285.8621	40.8882	B1=21.1, B2=20.9, R2=19.9	USNO-B1
79.8	285.8921	40.8733		NED
80.6	285.8754	40.9150		NED
82.1	285.9158	40.9064		NED
82.9	285.8712	40.8769		NED
85.3	285.8683	40.9128		NED
86.0	285.8954	40.8719		NED
87.0	285.9200	40.9025		NED
87.2	285.8596	40.8869		NED
87.5	285.9133	40.9114		NED
87.5	285.8800	40.9186		NED
88.0	285.9167	40.8822		NED
88.3	285.8958	40.8712	B1=19.4, R1=17.8, R2=17.7	USNO-B1
88.5	285.8592	40.8867		NED
89.1	285.9104	40.9142		NED
90.1	285.8738	40.8731		NED
90.9	285.8563	40.8972		NED
91.3	285.8733	40.8731		NED
91.9	285.9137	40.8775		NED
92.0	285.9221	40.8886		NED
92.4	285.9192	40.8828		NED
92.9	285.8904	40.9211		NED
93.3	285.8737	40.9183	B1=20.7, B2=20.8, R2=20.0	USNO-B1
93.5	285.8596	40.9083		NED
93.9	285.8571	40.8858		NED
94.4	285.9062	40.8725		NED
94.4	285.8679	40.8747		NED
95.0	285.9017	40.8706		NED
95.1	285.8825	40.9211		NED
95.9	285.8988	40.9208		NED
97.3	285.9238	40.9028		NED
97.6	285.9042	40.9200		NED
98.5	285.9104	40.8731		NED
98.8	285.9167	40.9133		NED
98.9	285.8542	40.9014		NED
99.0	285.8575	40.8819		NED
99.4	285.8863	40.9228		NED
99.6	285.8899	40.9229	B1=20.6, B2=20.2, I=18.4, R1=18.8, R2=18.6	USNO-B1
102.5	285.9221	40.8811		NED
102.8	285.9054	40.8694		NED
103.0	285.9054	40.8694		NED
105.4	285.8512	40.8992		NED
105.6	285.8650	40.8725		NED
108.5	285.9288	40.8897		NED
108.7	285.9204	40.9144	B1=20.9, R2=19.7	USNO-B1
108.8	285.9083	40.8686		NED
108.9	285.8604	40.9161		NED
108.9	285.9288	40.8895	B1=21.1, B2=20.9, I=18.2, R2=19.1	USNO-B1
109.2	285.8504	40.9028		NED
109.3	285.8670	40.8701	B2=19.9, I=18.6, R1=19.4, R2=19.9	USNO-B1
114.0	285.9312	40.8919		NED
114.5	285.8746	40.9250		NED
114.5	285.9062	40.9244		NED
114.5	285.8762	40.8650		NED
114.8	285.8749	40.9252	I=18.6, R1=19.6, R2=19.8	USNO-B1
114.8	285.9296	40.8850		NED
115.6	285.8521	40.8803		NED
115.7	285.9321	40.8969		NED
117.7	285.8971	40.9275		NED
117.8	285.8973	40.9275	B2=20.9, I=18.1, R1=19.3, R2=19.1	USNO-B1
117.9	285.9146	40.8686		NED
118.5	285.9103	40.8664	B1=19.9, B2=20.1, I=18.6, R1=19.1, R2=18.6	USNO-B1
120.2	285.8621	40.8689		NED
120.3	285.9292	40.9100		NED
120.8	285.8546	40.9158		NED
121.1	285.8512	40.8781		NED
121.2	285.8563	40.8728		NED
121.9	285.8708	40.8644		NED
122.3	285.8925	40.8614		NED
122.3	285.9212	40.8714		NED
123.0	285.9275	40.8769		NED
123.0	285.8450	40.9014		NED
123.1	285.9338	40.8883		NED
124.2	285.8571	40.9194		NED
124.3	285.9279	40.8767		NED
124.5	285.8867	40.9297		NED
125.1	285.9321	40.8825		NED
125.5	285.8454	40.9056		NED
125.5	285.8450	40.8856		NED
126.7	285.8675	40.9261		NED
127.4	285.9204	40.9217		NED
128.2	285.8604	40.9233	B2=19.9, R2=20.0	USNO-B1
128.5	285.9150	40.9253		NED
128.6	285.8846	40.8597		NED
128.9	285.8425	40.8908		NED
129.7	285.8462	40.8803		NED
130.3	285.8979	40.9308		NED
130.9	285.8482	40.8767	B2=20.8, I=18.3, R1=19.2, R2=19.2	USNO-B1
131.1	285.9117	40.8631		NED
131.2	285.8867	40.8589		NED
131.2	285.9354	40.8844		NED
131.3	285.8479	40.8764		NED
131.5	285.9279	40.8731		NED
133.0	285.9125	40.9278		NED
134.6	285.8496	40.8731		NED
135.8	285.9367	40.8830	B1=21.1, B2=20.9, R2=19.3	USNO-B1
136.4	285.8392	40.8967		NED
138.0	285.8451	40.8768	B1=20.9, R2=19.9	USNO-B1
138.1	285.8917	40.8569		NED
139.7	285.8400	40.8850	B2=20.9, R2=19.7	USNO-B1
140.2	285.9008	40.9333		NED
140.5	285.9400	40.8878		NED
141.1	285.9312	40.8719		NED
141.1	285.8908	40.9344		NED
141.6	285.9358	40.9131		NED
142.2	285.9217	40.9264		NED
142.9	285.9317	40.8717		NED
143.1	285.8854	40.9350		NED
143.1	285.8458	40.8733		NED
143.3	285.8542	40.8658		NED
143.5	285.8392	40.9078		NED
143.9	285.8425	40.9139		NED
143.9	285.8658	40.8594		NED
144.1	285.8600	40.8622		NED
144.4	285.9321	40.9194		NED
145.0	285.8608	40.8614		NED
145.7	285.9171	40.9300		NED
145.9	285.8375	40.8858		NED
146.2	285.9175	40.8608		NED
147.2	285.8567	40.9278		NED
147.3	285.8696	40.8572	I=18.5, R2=19.8	USNO-B1
148.7	285.8375	40.9081		NED
148.9	285.9096	40.9336		NED
149.3	285.8875	40.8539		NED
150.3	285.8821	40.8539		NED
150.7	285.8375	40.8808		NED
150.8	285.8633	40.9322		NED
151.6	285.8946	40.8533		NED
153.4	285.8950	40.8528		NED
153.5	285.9450	40.9031		NED
154.9	285.8404	40.8733		NED
155.2	285.8954	40.9381		NED
156.0	285.8805	40.8525	B2=20.4, R2=20.1	USNO-B1
157.1	285.8704	40.8542		NED
157.5	285.8908	40.8515	I=18.6, R2=19.9	USNO-B1
157.7	285.9338	40.8672		NED
157.7	285.9306	40.8644	B2=20.9, I=18.6, R1=19.0, R2=18.8	USNO-B1
157.8	285.9446	40.9086		NED
159.3	285.8762	40.8522		NED
159.4	285.8537	40.8600		NED
159.6	285.8486	40.8636	I=18.2, R2=18.7	USNO-B1
160.2	285.8762	40.8519		NED
160.7	285.9371	40.8689		NED
161.0	285.8496	40.8622		NED
162.1	285.9246	40.9317		NED
162.1	285.9329	40.9261		NED
162.8	285.8917	40.9406		NED
163.0	285.8496	40.9292		NED
163.6	285.8854	40.8500		NED
163.7	285.9492	40.8892		NED
164.2	285.8388	40.9203		NED
164.6	285.8967	40.8500		NED
165.3	285.9300	40.8611		NED
167.1	285.9117	40.9386		NED
167.9	285.8279	40.8981		NED
168.2	285.8308	40.9103		NED
168.3	285.9171	40.9372		NED
169.0	285.8279	40.9008		NED
169.3	285.8417	40.9256		NED
169.3	285.8663	40.9389		NED
169.8	285.9446	40.8731		NED
169.9	285.8304	40.8797		NED
170.2	285.9446	40.8733		NED
171.0	285.9013	40.9419	I=18.5, R2=19.9	USNO-B1
171.1	285.9304	40.9314		NED
171.2	285.9372	40.8643	I=18.5, R2=17.2	USNO-B1
173.0	285.8313	40.8758		NED
173.0	285.8267	40.9036		NED
173.6	285.9358	40.8622		NED
174.1	285.9050	40.9422		NED
174.9	285.8471	40.8586		NED
175.3	285.8525	40.8553		NED
175.4	285.9079	40.9419		NED
178.0	285.9454	40.9206		NED
178.3	285.8242	40.8994		NED
178.7	285.8950	40.8458		NED
179.0	285.8617	40.9403		NED
179.2	285.8246	40.9038	B1=20.8, I=18.6, R2=19.6	USNO-B1
179.6	285.8283	40.9144		NED
179.8	285.9271	40.9364		NED
180.0	285.8742	40.9439		NED
180.1	285.8744	40.9440	B1=17.6, B2=18.0, I=15.3, R1=15.9, R2=16.1	USNO-B1
181.1	285.8517	40.8539		NED
181.4	285.8517	40.8538	B2=20.4, R1=19.4, R2=18.7	USNO-B1
181.6	285.9283	40.8542		NED
182.4	285.8329	40.9228		NED
182.9	285.9538	40.9103		NED
182.9	285.9537	40.9104	B1=19.5, B2=19.7, I=17.6, R1=18.1, R2=17.7	USNO-B1
183.1	285.9371	40.8594		NED
183.7	285.8667	40.8472		NED
183.8	285.8217	40.8950		NED
184.1	285.9563	40.9028		NED
184.1	285.9404	40.9289		NED
184.5	285.8438	40.9331		NED
185.9	285.8274	40.8737	I=18.6, R1=20.0	USNO-B1
186.9	285.8363	40.8625		NED
187.4	285.9483	40.9225		NED
187.5	285.9546	40.8789		NED
187.6	285.8729	40.8447		NED
187.7	285.8358	40.8625		NED
189.1	285.8263	40.8736		NED
189.5	285.8854	40.9478		NED
190.0	285.8256	40.9165	B2=20.6, I=18.6, R2=20.0	USNO-B1
190.1	285.9179	40.9436		NED
190.2	285.9579	40.9053		NED
190.5	285.8254	40.9164		NED
190.9	285.8775	40.9475		NED
191.1	285.8776	40.9476	B2=20.8, I=18.6, R2=19.6	USNO-B1
192.1	285.9246	40.8489		NED
192.3	285.9104	40.8442		NED
192.7	285.8258	40.9192		NED
194.0	285.8462	40.8525		NED
194.2	285.9240	40.9425	B2=20.8, I=18.1, R2=19.4	USNO-B1
194.8	285.8554	40.8478		NED
194.8	285.8446	40.9375		NED
196.2	285.9600	40.8844		NED
196.4	285.8751	40.8418	B2=20.6, I=18.5, R1=19.1, R2=19.5	USNO-B1
197.2	285.9113	40.9475		NED
197.6	285.9110	40.9477	B2=20.6, R2=19.6	USNO-B1
197.8	285.8375	40.8569		NED
197.9	285.9354	40.8528		NED
198.2	285.8337	40.8599	B1=16.1, B2=16.3, I=14.0, R1=14.6, R2=14.9	USNO-B1
198.5	285.8338	40.8597		NED
198.5	285.9558	40.8722		NED
199.2	285.8700	40.8419		NED
199.3	285.8712	40.9489		NED
199.6	285.8792	40.8403		NED
199.6	285.9229	40.9447		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