GRB 250824B
GCN Circular 41543
Subject
Fermi GRB 250824B: Global MASTER-Net observations report
Date
2025-08-25T17:16:08Z (a month ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
Via
email
V.Lipunov, E.Gorbovskoy, A.Kuznetsov, K.Zhirkov, I.Panchenko, N.Tiurina, P.Balanutsa, V.Topolev, D.Vlasenko,
G.Antipov, A.Sankovich, Yu.Tselik, Ya.Kechin, V.Senik, A.Chasovnikov, K.Labsina, I. Gorbunov (Lomonosov MSU),
O.Gress, N.Budnev (ISU),
C.Francile, F. Podesta, R.Podesta, E. Gonzalez (Observatorio Astronomico Felix Aguilar (OAFA),
A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),
A.Sosnovskij (CrAO),
A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity),
D.Buckley (SAAO),
R.Rebolo (The Instituto de Astrofisica de Canarias),
L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,
A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory)
MASTER-OAFA robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Argentina (OAFA observatory of San Juan National University) started inspect of the Fermi GRB 250824B ( Fermi GBM team, GCN 41527) errorbox 33953 sec after notice time and 33960 sec after trigger time at 2025-08-24 23:04:13 UT, with upper limit up to 23.0 mag. Observations started at twilight. The observations began at zenith distance = 4 deg. The sun altitude is -11.4 deg.
MASTER-SAAO robotic telescope located in South Africa (South African Astronomical Observatory) started inspect of the Fermi GRB 250824B errorbox 1 days 11812 sec after notice time and 1 days 11818 sec after trigger time at 2025-08-25 16:55:12 UT, with upper limit up to 17.7 mag. Observations started at twilight. The observations began at zenith distance = 3 deg. The sun altitude is -8.7 deg.
The galactic latitude b = 8 deg., longitude l = 346 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=2976525
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
33990 | 2025-08-24 23:04:13 | MASTER-OAFA | (16h 35m 33.85s , -34d 39m 23.0s) | C | 60 | 17.6 |
34050 | 2025-08-24 23:04:13 | MASTER-OAFA | (16h 35m 33.85s , -34d 39m 23.0s) | C | 180 | 18.0 | Coadd
34067 | 2025-08-24 23:05:30 | MASTER-OAFA | (16h 45m 12.85s , -34d 40m 49.9s) | C | 60 | 17.6 |
34127 | 2025-08-24 23:05:30 | MASTER-OAFA | (16h 45m 12.85s , -34d 40m 50.0s) | C | 180 | 18.3 | Coadd
34143 | 2025-08-24 23:06:46 | MASTER-OAFA | (16h 35m 35.17s , -34d 40m 03.8s) | C | 60 | 17.7 |
34218 | 2025-08-24 23:08:02 | MASTER-OAFA | (16h 45m 15.27s , -34d 38m 56.7s) | C | 60 | 17.8 |
34294 | 2025-08-24 23:09:18 | MASTER-OAFA | (16h 35m 31.47s , -34d 40m 14.9s) | C | 60 | 17.7 |
34372 | 2025-08-24 23:10:35 | MASTER-OAFA | (16h 21m 40.27s , -36d 32m 28.1s) | C | 60 | 18.2 |
34448 | 2025-08-24 23:11:52 | MASTER-OAFA | (16h 31m 38.29s , -36d 31m 55.2s) | C | 60 | 18.0 |
34525 | 2025-08-24 23:13:08 | MASTER-OAFA | (16h 21m 47.37s , -36d 32m 26.9s) | C | 60 | 18.3 |
34601 | 2025-08-24 23:14:25 | MASTER-OAFA | (16h 31m 38.55s , -36d 33m 53.4s) | C | 60 | 18.0 |
34677 | 2025-08-24 23:15:40 | MASTER-OAFA | (16h 21m 47.32s , -36d 32m 56.9s) | C | 60 | 18.2 |
34752 | 2025-08-24 23:16:55 | MASTER-OAFA | (16h 17m 03.71s , -34d 39m 09.2s) | C | 60 | 18.4 |
34828 | 2025-08-24 23:18:11 | MASTER-OAFA | (16h 26m 50.74s , -34d 38m 10.8s) | C | 60 | 18.2 |
34903 | 2025-08-24 23:19:27 | MASTER-OAFA | (16h 17m 01.48s , -34d 38m 26.9s) | C | 60 | 18.1 |
34980 | 2025-08-24 23:20:43 | MASTER-OAFA | (16h 26m 45.27s , -34d 37m 50.9s) | C | 60 | 18.1 |
35056 | 2025-08-24 23:21:59 | MASTER-OAFA | (16h 17m 06.81s , -34d 38m 26.1s) | C | 60 | 18.4 |
35132 | 2025-08-24 23:23:15 | MASTER-OAFA | (16h 31m 46.56s , -32d 46m 14.8s) | C | 60 | 18.3 |
35192 | 2025-08-24 23:23:15 | MASTER-OAFA | (16h 31m 46.56s , -32d 46m 14.8s) | C | 180 | 18.4 | Coadd
35207 | 2025-08-24 23:24:31 | MASTER-OAFA | (16h 41m 14.46s , -32d 44m 51.6s) | C | 60 | 17.9 |
35267 | 2025-08-24 23:24:31 | MASTER-OAFA | (16h 41m 14.46s , -32d 44m 51.7s) | C | 180 | 18.0 | Coadd
35284 | 2025-08-24 23:25:47 | MASTER-OAFA | (16h 31m 43.58s , -32d 46m 05.1s) | C | 60 | 18.2 |
35359 | 2025-08-24 23:27:03 | MASTER-OAFA | (16h 41m 17.58s , -32d 44m 52.4s) | C | 60 | 17.9 |
35436 | 2025-08-24 23:28:19 | MASTER-OAFA | (16h 31m 40.60s , -32d 45m 16.7s) | C | 60 | 18.2 |
35513 | 2025-08-24 23:29:37 | MASTER-OAFA | (16h 13m 41.38s , -32d 44m 35.6s) | C | 60 | 18.4 |
35591 | 2025-08-24 23:30:54 | MASTER-OAFA | (16h 23m 06.58s , -32d 45m 55.9s) | C | 60 | 18.3 |
35667 | 2025-08-24 23:32:10 | MASTER-OAFA | (16h 13m 42.72s , -32d 45m 24.3s) | C | 60 | 18.2 |
35743 | 2025-08-24 23:33:26 | MASTER-OAFA | (16h 23m 10.45s , -32d 44m 24.2s) | C | 60 | 18.3 |
35819 | 2025-08-24 23:34:42 | MASTER-OAFA | (16h 13m 40.11s , -32d 45m 05.5s) | C | 60 | 18.1 |
35896 | 2025-08-24 23:35:59 | MASTER-OAFA | (16h 29m 04.22s , -30d 51m 29.6s) | C | 60 | 18.2 |
35956 | 2025-08-24 23:35:59 | MASTER-OAFA | (16h 29m 04.21s , -30d 51m 29.6s) | C | 180 | 18.8 | Coadd
35971 | 2025-08-24 23:37:14 | MASTER-OAFA | (16h 38m 25.02s , -30d 50m 49.4s) | C | 60 | 17.8 |
36046 | 2025-08-24 23:38:30 | MASTER-OAFA | (16h 29m 11.62s , -30d 51m 29.4s) | C | 60 | 18.2 |
36121 | 2025-08-24 23:39:45 | MASTER-OAFA | (16h 38m 23.42s , -30d 52m 48.9s) | C | 60 | 17.6 |
36197 | 2025-08-24 23:41:01 | MASTER-OAFA | (16h 29m 11.50s , -30d 52m 17.2s) | C | 60 | 18.1 |
36273 | 2025-08-24 23:42:16 | MASTER-OAFA | (16h 45m 18.86s , -34d 38m 42.1s) | C | 60 | 17.6 |
36348 | 2025-08-24 23:43:31 | MASTER-OAFA | (16h 45m 19.00s , -34d 40m 22.5s) | C | 60 | 17.6 |
36425 | 2025-08-24 23:44:48 | MASTER-OAFA | (16h 45m 21.36s , -34d 38m 28.6s) | C | 60 | 17.6 |
36501 | 2025-08-24 23:46:04 | MASTER-OAFA | (16h 35m 33.55s , -34d 39m 01.5s) | C | 60 | 17.5 |
36575 | 2025-08-24 23:47:19 | MASTER-OAFA | (16h 35m 33.38s , -34d 38m 01.0s) | C | 60 | 17.5 |
36649 | 2025-08-24 23:48:32 | MASTER-OAFA | (16h 35m 38.91s , -34d 39m 00.9s) | C | 60 | 17.5 |
36727 | 2025-08-24 23:49:50 | MASTER-OAFA | (16h 31m 43.42s , -36d 33m 30.7s) | C | 60 | 17.6 |
36801 | 2025-08-24 23:51:04 | MASTER-OAFA | (16h 31m 50.46s , -36d 33m 30.5s) | C | 60 | 17.7 |
36861 | 2025-08-24 23:51:04 | MASTER-OAFA | (16h 31m 50.46s , -36d 33m 30.6s) | C | 180 | 18.3 | Coadd
36877 | 2025-08-24 23:52:21 | MASTER-OAFA | (16h 31m 47.08s , -36d 31m 35.2s) | C | 60 | 17.7 |
36952 | 2025-08-24 23:53:36 | MASTER-OAFA | (16h 21m 49.89s , -36d 32m 43.5s) | C | 60 | 18.2 |
37027 | 2025-08-24 23:54:50 | MASTER-OAFA | (16h 21m 52.23s , -36d 31m 13.0s) | C | 60 | 18.0 |
37103 | 2025-08-24 23:56:07 | MASTER-OAFA | (16h 21m 46.32s , -36d 32m 04.0s) | C | 60 | 18.0 |
37179 | 2025-08-24 23:57:22 | MASTER-OAFA | (16h 26m 49.33s , -34d 37m 37.5s) | C | 60 | 17.8 |
37253 | 2025-08-24 23:58:36 | MASTER-OAFA | (16h 26m 54.89s , -34d 38m 37.4s) | C | 60 | 17.8 |
37330 | 2025-08-24 23:59:54 | MASTER-OAFA | (16h 26m 49.70s , -34d 39m 36.7s) | C | 60 | 17.9 |
37406 | 2025-08-25 00:01:09 | MASTER-OAFA | (16h 17m 11.71s , -34d 39m 08.6s) | C | 60 | 18.0 |
37483 | 2025-08-25 00:02:26 | MASTER-OAFA | (16h 17m 09.75s , -34d 37m 39.5s) | C | 60 | 18.1 |
37560 | 2025-08-25 00:03:44 | MASTER-OAFA | (16h 17m 09.94s , -34d 39m 03.3s) | C | 60 | 18.2 |
37638 | 2025-08-25 00:05:01 | MASTER-OAFA | (16h 41m 20.88s , -32d 44m 38.6s) | C | 60 | 17.7 |
37716 | 2025-08-25 00:06:19 | MASTER-OAFA | (16h 41m 15.67s , -32d 45m 31.0s) | C | 60 | 17.7 |
37776 | 2025-08-25 00:06:19 | MASTER-OAFA | (16h 41m 15.62s , -32d 45m 30.6s) | C | 180 | 17.9 | Coadd
37794 | 2025-08-25 00:07:37 | MASTER-OAFA | (16h 41m 15.13s , -32d 44m 30.9s) | C | 60 | 17.8 |
37870 | 2025-08-25 00:08:53 | MASTER-OAFA | (16h 31m 52.02s , -32d 45m 11.1s) | C | 60 | 18.2 |
37945 | 2025-08-25 00:10:08 | MASTER-OAFA | (16h 31m 45.37s , -32d 46m 10.7s) | C | 60 | 18.3 |
38021 | 2025-08-25 00:11:24 | MASTER-OAFA | (16h 31m 52.37s , -32d 45m 55.4s) | C | 60 | 18.2 |
38097 | 2025-08-25 00:12:41 | MASTER-OAFA | (16h 23m 15.22s , -32d 44m 03.7s) | C | 60 | 18.4 |
38172 | 2025-08-25 00:13:55 | MASTER-OAFA | (16h 23m 15.38s , -32d 45m 37.0s) | C | 60 | 18.4 |
38246 | 2025-08-25 00:15:09 | MASTER-OAFA | (16h 23m 18.45s , -32d 44m 02.9s) | C | 60 | 18.4 |
38322 | 2025-08-25 00:16:26 | MASTER-OAFA | (16h 13m 42.34s , -32d 44m 36.1s) | C | 60 | 18.5 |
38382 | 2025-08-25 00:16:26 | MASTER-OAFA | (16h 13m 42.34s , -32d 44m 36.2s) | C | 180 | 19.3 | Coadd
38397 | 2025-08-25 00:17:40 | MASTER-OAFA | (16h 13m 42.50s , -32d 43m 36.5s) | C | 60 | 18.5 |
38472 | 2025-08-25 00:18:55 | MASTER-OAFA | (16h 13m 48.41s , -32d 44m 36.7s) | C | 60 | 18.6 |
38551 | 2025-08-25 00:20:14 | MASTER-OAFA | (16h 38m 28.04s , -30d 52m 51.3s) | C | 60 | 18.1 |
38629 | 2025-08-25 00:21:32 | MASTER-OAFA | (16h 38m 35.38s , -30d 52m 26.8s) | C | 60 | 18.1 |
38707 | 2025-08-25 00:22:50 | MASTER-OAFA | (16h 38m 31.94s , -30d 51m 07.4s) | C | 60 | 18.1 |
38782 | 2025-08-25 00:24:05 | MASTER-OAFA | (16h 29m 12.64s , -30d 52m 29.6s) | C | 60 | 19.0 |
38860 | 2025-08-25 00:25:24 | MASTER-OAFA | (16h 29m 15.31s , -30d 50m 59.5s) | C | 60 | 19.1 |
38920 | 2025-08-25 00:25:24 | MASTER-OAFA | (16h 29m 15.31s , -30d 50m 59.5s) | C | 180 | 18.7 | Coadd
38936 | 2025-08-25 00:26:39 | MASTER-OAFA | (16h 29m 10.42s , -30d 51m 37.5s) | C | 60 | 19.2 |
39014 | 2025-08-25 00:27:57 | MASTER-OAFA | (16h 45m 23.00s , -34d 38m 11.4s) | C | 60 | 18.4 |
39087 | 2025-08-25 00:29:10 | MASTER-OAFA | (16h 45m 28.91s , -34d 39m 11.4s) | C | 60 | 18.4 |
39147 | 2025-08-25 00:29:10 | MASTER-OAFA | (16h 45m 28.91s , -34d 39m 11.4s) | C | 180 | 18.0 | Coadd
39165 | 2025-08-25 00:30:28 | MASTER-OAFA | (16h 45m 22.63s , -34d 40m 11.1s) | C | 60 | 18.4 |
39240 | 2025-08-25 00:31:43 | MASTER-OAFA | (16h 35m 44.77s , -34d 39m 41.5s) | C | 60 | 18.5 |
39318 | 2025-08-25 00:33:01 | MASTER-OAFA | (16h 35m 42.48s , -34d 37m 51.6s) | C | 60 | 18.5 |
39393 | 2025-08-25 00:34:17 | MASTER-OAFA | (16h 35m 42.66s , -34d 39m 40.6s) | C | 60 | 18.5 |
39468 | 2025-08-25 00:35:31 | MASTER-OAFA | (16h 31m 57.69s , -36d 31m 21.2s) | C | 60 | 18.6 |
39543 | 2025-08-25 00:36:47 | MASTER-OAFA | (16h 31m 51.08s , -36d 32m 13.9s) | C | 60 | 18.6 |
39621 | 2025-08-25 00:38:04 | MASTER-OAFA | (16h 31m 51.67s , -36d 31m 13.9s) | C | 60 | 18.6 |
39741 | 2025-08-25 00:40:04 | MASTER-OAFA | (16h 22m 00.21s , -36d 43m 40.2s) | C | 60 | 18.7 |
39818 | 2025-08-25 00:41:22 | MASTER-OAFA | (16h 21m 54.49s , -36d 44m 39.5s) | C | 60 | 18.7 |
39895 | 2025-08-25 00:42:38 | MASTER-OAFA | (16h 22m 00.31s , -36d 44m 11.6s) | C | 60 | 18.7 |
39971 | 2025-08-25 00:43:54 | MASTER-OAFA | (16h 27m 00.83s , -34d 49m 15.4s) | C | 60 | 23.0 |
40046 | 2025-08-25 00:45:09 | MASTER-OAFA | (16h 27m 00.88s , -34d 50m 21.8s) | C | 60 | 18.6 |
40122 | 2025-08-25 00:46:25 | MASTER-OAFA | (16h 27m 03.85s , -34d 49m 14.4s) | C | 60 | 23.0 |
40197 | 2025-08-25 00:47:41 | MASTER-OAFA | (16h 17m 14.37s , -34d 49m 23.6s) | C | 60 | 18.7 |
40275 | 2025-08-25 00:48:58 | MASTER-OAFA | (16h 17m 14.82s , -34d 48m 22.8s) | C | 60 | 18.7 |
40350 | 2025-08-25 00:50:13 | MASTER-OAFA | (16h 17m 19.54s , -34d 49m 22.7s) | C | 60 | 18.7 |
40428 | 2025-08-25 00:51:32 | MASTER-OAFA | (16h 41m 24.66s , -32d 57m 24.9s) | C | 60 | 18.5 |
40503 | 2025-08-25 00:52:46 | MASTER-OAFA | (16h 41m 30.48s , -32d 56m 55.6s) | C | 60 | 18.4 |
40582 | 2025-08-25 00:54:06 | MASTER-OAFA | (16h 41m 28.42s , -32d 55m 43.1s) | C | 60 | 18.5 |
40659 | 2025-08-25 00:55:23 | MASTER-OAFA | (16h 31m 57.16s , -32d 56m 30.8s) | C | 60 | 19.0 |
40719 | 2025-08-25 00:55:23 | MASTER-OAFA | (16h 31m 57.16s , -32d 56m 30.8s) | C | 180 | 19.5 | Coadd
40737 | 2025-08-25 00:56:40 | MASTER-OAFA | (16h 31m 59.77s , -32d 55m 15.2s) | C | 60 | 19.2 |
40813 | 2025-08-25 00:57:56 | MASTER-OAFA | (16h 31m 54.45s , -32d 55m 55.8s) | C | 60 | 19.0 |
40889 | 2025-08-25 00:59:12 | MASTER-OAFA | (16h 23m 20.33s , -32d 54m 34.1s) | C | 60 | 19.5 |
40964 | 2025-08-25 01:00:27 | MASTER-OAFA | (16h 23m 27.22s , -32d 55m 34.0s) | C | 60 | 19.5 |
41024 | 2025-08-25 01:00:27 | MASTER-OAFA | (16h 23m 27.22s , -32d 55m 34.1s) | C | 180 | 19.8 | Coadd
41049 | 2025-08-25 01:01:52 | MASTER-OAFA | (16h 23m 20.82s , -32d 56m 33.3s) | C | 60 | 19.5 |
41124 | 2025-08-25 01:03:07 | MASTER-OAFA | (16h 13m 54.25s , -32d 56m 10.7s) | C | 60 | 19.4 |
41202 | 2025-08-25 01:04:25 | MASTER-OAFA | (16h 13m 52.54s , -32d 54m 14.5s) | C | 60 | 19.4 |
41277 | 2025-08-25 01:05:40 | MASTER-OAFA | (16h 13m 52.58s , -32d 56m 07.8s) | C | 60 | 19.3 |
41354 | 2025-08-25 01:06:57 | MASTER-OAFA | (16h 38m 43.17s , -31d 01m 29.4s) | C | 60 | 18.5 |
41430 | 2025-08-25 01:08:13 | MASTER-OAFA | (16h 38m 38.55s , -31d 02m 09.8s) | C | 60 | 18.5 |
41507 | 2025-08-25 01:09:30 | MASTER-OAFA | (16h 38m 38.27s , -31d 01m 09.0s) | C | 60 | 18.5 |
41582 | 2025-08-25 01:10:45 | MASTER-OAFA | (16h 29m 24.82s , -31d 01m 46.2s) | C | 60 | 19.5 |
41661 | 2025-08-25 01:12:04 | MASTER-OAFA | (16h 29m 19.49s , -31d 02m 45.6s) | C | 60 | 19.6 |
41740 | 2025-08-25 01:13:23 | MASTER-OAFA | (16h 29m 24.61s , -31d 02m 32.0s) | C | 60 | 19.5 |
41820 | 2025-08-25 01:14:43 | MASTER-OAFA | (16h 45m 32.41s , -34d 49m 49.3s) | C | 60 | 18.8 |
41895 | 2025-08-25 01:15:59 | MASTER-OAFA | (16h 45m 32.47s , -34d 51m 02.0s) | C | 60 | 18.8 |
41972 | 2025-08-25 01:17:15 | MASTER-OAFA | (16h 45m 35.46s , -34d 49m 48.7s) | C | 60 | 18.8 |
42048 | 2025-08-25 01:18:32 | MASTER-OAFA | (16h 31m 54.17s , -36d 43m 48.6s) | C | 60 | 18.6 |
42124 | 2025-08-25 01:19:48 | MASTER-OAFA | (16h 31m 54.28s , -36d 42m 48.2s) | C | 60 | 18.6 |
42200 | 2025-08-25 01:21:04 | MASTER-OAFA | (16h 32m 02.27s , -36d 43m 48.4s) | C | 60 | 18.6 |
42277 | 2025-08-25 01:22:21 | MASTER-OAFA | (16h 27m 00.81s , -34d 50m 36.1s) | C | 60 | 23.0 |
42352 | 2025-08-25 01:23:35 | MASTER-OAFA | (16h 27m 05.57s , -34d 50m 26.4s) | C | 60 | 23.0 |
42429 | 2025-08-25 01:24:52 | MASTER-OAFA | (16h 27m 03.53s , -34d 48m 58.9s) | C | 60 | 23.0 |
42505 | 2025-08-25 01:26:08 | MASTER-OAFA | (16h 41m 30.59s , -32d 57m 02.3s) | C | 60 | 18.4 |
42580 | 2025-08-25 01:27:24 | MASTER-OAFA | (16h 41m 33.91s , -32d 55m 37.4s) | C | 60 | 18.5 |
42659 | 2025-08-25 01:28:42 | MASTER-OAFA | (16h 41m 26.77s , -32d 56m 08.2s) | C | 60 | 18.5 |
42738 | 2025-08-25 01:30:02 | MASTER-OAFA | (16h 11m 42.80s , -31d 01m 05.8s) | C | 60 | 19.6 |
42814 | 2025-08-25 01:31:17 | MASTER-OAFA | (16h 20m 56.77s , -31d 02m 24.3s) | C | 60 | 19.6 |
42890 | 2025-08-25 01:32:33 | MASTER-OAFA | (16h 11m 42.58s , -31d 01m 52.9s) | C | 60 | 19.6 |
42966 | 2025-08-25 01:33:49 | MASTER-OAFA | (16h 20m 59.81s , -31d 00m 51.5s) | C | 60 | 19.6 |
43042 | 2025-08-25 01:35:05 | MASTER-OAFA | (16h 11m 39.84s , -31d 01m 54.5s) | C | 60 | 19.6 |
43121 | 2025-08-25 01:36:24 | MASTER-OAFA | (16h 23m 28.18s , -32d 54m 32.8s) | C | 60 | 19.5 |
43196 | 2025-08-25 01:37:39 | MASTER-OAFA | (16h 23m 22.49s , -32d 55m 28.0s) | C | 60 | 19.5 |
43284 | 2025-08-25 01:39:07 | MASTER-OAFA | (16h 23m 22.23s , -32d 54m 27.9s) | C | 60 | 19.5 |
43362 | 2025-08-25 01:40:25 | MASTER-OAFA | (16h 38m 45.90s , -31d 02m 01.6s) | C | 60 | 18.3 |
43435 | 2025-08-25 01:41:39 | MASTER-OAFA | (16h 38m 40.56s , -31d 03m 01.5s) | C | 60 | 18.4 |
43513 | 2025-08-25 01:42:56 | MASTER-OAFA | (16h 38m 46.40s , -31d 02m 33.2s) | C | 60 | 18.4 |
44833 | 2025-08-25 02:04:56 | MASTER-OAFA | (16h 21m 04.33s , -31d 00m 58.7s) | C | 60 | 19.5 |
44910 | 2025-08-25 02:06:13 | MASTER-OAFA | (16h 20m 58.26s , -31d 01m 38.5s) | C | 60 | 19.4 |
44970 | 2025-08-25 02:06:13 | MASTER-OAFA | (16h 20m 58.26s , -31d 01m 38.6s) | C | 180 | 19.6 | Coadd
44986 | 2025-08-25 02:07:29 | MASTER-OAFA | (16h 20m 58.30s , -31d 00m 38.4s) | C | 60 | 19.5 |
45063 | 2025-08-25 02:08:47 | MASTER-OAFA | (16h 11m 44.82s , -31d 01m 23.1s) | C | 60 | 19.5 |
45138 | 2025-08-25 02:10:02 | MASTER-OAFA | (16h 11m 38.38s , -31d 02m 23.4s) | C | 60 | 19.4 |
45214 | 2025-08-25 02:11:17 | MASTER-OAFA | (16h 11m 44.92s , -31d 02m 18.3s) | C | 60 | 19.5 |
47426 | 2025-08-25 02:48:09 | MASTER-OAFA | (16h 21m 03.31s , -31d 02m 28.1s) | C | 60 | 19.3 |
47503 | 2025-08-25 02:49:26 | MASTER-OAFA | (16h 21m 06.15s , -31d 01m 10.4s) | C | 60 | 19.5 |
47579 | 2025-08-25 02:50:42 | MASTER-OAFA | (16h 11m 39.75s , -31d 01m 45.0s) | C | 60 | 19.4 |
47653 | 2025-08-25 02:51:57 | MASTER-OAFA | (16h 11m 41.24s , -31d 00m 45.8s) | C | 60 | 19.4 |
47729 | 2025-08-25 02:53:13 | MASTER-OAFA | (16h 11m 47.36s , -31d 01m 46.3s) | C | 60 | 19.4 |
49692 | 2025-08-25 03:25:56 | MASTER-OAFA | (16h 21m 01.37s , -31d 03m 21.4s) | C | 60 | 18.6 |
49768 | 2025-08-25 03:27:11 | MASTER-OAFA | (16h 21m 07.46s , -31d 03m 05.3s) | C | 60 | 18.5 |
49844 | 2025-08-25 03:28:27 | MASTER-OAFA | (16h 21m 05.27s , -31d 01m 47.1s) | C | 60 | 18.6 |
98249 | 2025-08-25 16:55:12 | MASTER-SAAO | (16h 34m 21.01s , -35d 04m 06.8s) | C | 60 | 16.5 |
98339 | 2025-08-25 16:56:43 | MASTER-SAAO | (16h 43m 57.78s , -35d 05m 36.2s) | C | 60 | 16.7 |
98431 | 2025-08-25 16:58:14 | MASTER-SAAO | (16h 20m 34.54s , -36d 56m 18.5s) | C | 60 | 17.2 |
98521 | 2025-08-25 16:59:44 | MASTER-SAAO | (16h 30m 30.26s , -36d 58m 30.6s) | C | 60 | 17.2 |
98618 | 2025-08-25 17:01:21 | MASTER-SAAO | (16h 15m 54.89s , -35d 02m 54.0s) | C | 60 | 17.4 |
98710 | 2025-08-25 17:02:53 | MASTER-SAAO | (16h 25m 35.36s , -35d 02m 24.3s) | C | 60 | 17.5 |
98800 | 2025-08-25 17:04:24 | MASTER-SAAO | (16h 30m 32.11s , -33d 10m 42.4s) | C | 60 | 17.5 |
98891 | 2025-08-25 17:05:54 | MASTER-SAAO | (16h 40m 07.88s , -33d 10m 54.7s) | C | 60 | 17.5 |
98980 | 2025-08-25 17:07:24 | MASTER-SAAO | (16h 34m 23.67s , -35d 02m 57.0s) | C | 60 | 17.7 |
Filter C is a clear (unfiltred) band.
The observation and reduction will continue.
The message may be cited.
GCN Circular 41527
Subject
GRB 250824B: Fermi GBM Final Real-time Localization
Date
2025-08-24T13:48:54Z (2 months ago)
From
Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>
Via
email
The Fermi GBM team reports the detection of a likely SHORT GRB
At 13:38:13 UT on 24 Aug 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250824B (trigger 777735498.8624 / 250824568).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 248.3, Dec = -35.6 (J2000 degrees, equivalent to J2000 16h 33m, -35d 36'), with a statistical uncertainty of 7.7 degrees.
The angle from the Fermi LAT boresight is 27.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250824568/quicklook/glg_skymap_all_bn250824568.png
The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250824568/quicklook/glg_healpix_all_bn250824568.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250824568/quicklook/glg_lc_medres34_bn250824568.gif