GRB 251228A
GCN Circular 43248
Subject
Fermi GRB 251228A: Global MASTER-Net observations report
Date
2025-12-28T05:15:35Z (2 days 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-Kislovodsk robotic telescope [1] located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the Fermi GRB 251228A ( Fermi GBM team, GCN 43246) errorbox 4566 sec after notice time and 4601 sec after trigger time at 2025-12-28 01:58:51 UT, with upper limit up to 17.7 mag. The observations began at zenith distance = 14 deg. The sun altitude is -28.7 deg.
The galactic latitude b = 51 deg., longitude l = 166 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=3087807
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
4631 | 2025-12-28 01:58:51 | MASTER-Kislovodsk | (10h 04m 18.19s , +50d 46m 44.1s) | C | 60 | 17.2 |
4631 | 2025-12-28 01:58:51 | MASTER-Kislovodsk | (09h 57m 14.55s , +51d 07m 25.1s) | C | 60 | 17.5 |
4723 | 2025-12-28 02:00:23 | MASTER-Kislovodsk | (09h 59m 11.64s , +48d 50m 59.9s) | C | 60 | 17.0 |
4725 | 2025-12-28 02:00:25 | MASTER-Kislovodsk | (09h 52m 24.48s , +49d 12m 11.6s) | C | 60 | 17.4 |
4829 | 2025-12-28 02:02:09 | MASTER-Kislovodsk | (09h 45m 17.93s , +50d 44m 48.3s) | C | 60 | 17.2 |
4829 | 2025-12-28 02:02:09 | MASTER-Kislovodsk | (09h 38m 14.89s , +51d 05m 43.5s) | C | 60 | 17.3 |
4922 | 2025-12-28 02:03:42 | MASTER-Kislovodsk | (10h 17m 30.25s , +48d 53m 01.1s) | C | 60 | 17.0 |
4922 | 2025-12-28 02:03:42 | MASTER-Kislovodsk | (10h 10m 42.22s , +49d 14m 15.0s) | C | 60 | 17.4 |
5018 | 2025-12-28 02:05:17 | MASTER-Kislovodsk | (09h 50m 33.43s , +52d 39m 46.6s) | C | 60 | 17.1 |
5018 | 2025-12-28 02:05:18 | MASTER-Kislovodsk | (09h 43m 11.63s , +53d 00m 12.0s) | C | 60 | 17.3 |
5337 | 2025-12-28 02:10:37 | MASTER-Kislovodsk | (10h 04m 06.83s , +50d 46m 06.6s) | C | 60 | 17.5 |
5337 | 2025-12-28 02:10:37 | MASTER-Kislovodsk | (09h 57m 01.40s , +51d 05m 30.2s) | C | 60 | 17.3 |
5429 | 2025-12-28 02:12:08 | MASTER-Kislovodsk | (09h 59m 08.41s , +48d 52m 46.4s) | C | 60 | 17.7 |
5429 | 2025-12-28 02:12:08 | MASTER-Kislovodsk | (09h 52m 19.73s , +49d 12m 21.2s) | C | 60 | 17.3 |
5523 | 2025-12-28 02:13:43 | MASTER-Kislovodsk | (09h 45m 15.46s , +50d 45m 29.2s) | C | 60 | 17.3 |
5523 | 2025-12-28 02:13:43 | MASTER-Kislovodsk | (09h 38m 11.21s , +51d 04m 53.5s) | C | 60 | 17.0 |
5619 | 2025-12-28 02:15:19 | MASTER-Kislovodsk | (10h 17m 21.80s , +48d 51m 08.9s) | C | 60 | 17.3 |
5619 | 2025-12-28 02:15:19 | MASTER-Kislovodsk | (10h 10m 32.65s , +49d 10m 46.8s) | C | 60 | 17.3 |
5717 | 2025-12-28 02:16:57 | MASTER-Kislovodsk | (09h 50m 31.71s , +52d 39m 11.2s) | C | 60 | 17.5 |
5717 | 2025-12-28 02:16:57 | MASTER-Kislovodsk | (09h 43m 09.29s , +52d 58m 26.3s) | C | 60 | 17.0 |
5816 | 2025-12-28 02:18:36 | MASTER-Kislovodsk | (10h 10m 16.22s , +52d 41m 00.0s) | C | 60 | 17.4 |
5816 | 2025-12-28 02:18:36 | MASTER-Kislovodsk | (10h 02m 52.62s , +53d 00m 22.2s) | C | 60 | 17.1 |
5914 | 2025-12-28 02:20:14 | MASTER-Kislovodsk | (09h 55m 09.39s , +46d 56m 17.6s) | C | 60 | 17.2 |
5914 | 2025-12-28 02:20:14 | MASTER-Kislovodsk | (09h 48m 36.78s , +47d 16m 10.0s) | C | 60 | 17.0 |
6009 | 2025-12-28 02:21:49 | MASTER-Kislovodsk | (10h 04m 12.28s , +50d 46m 34.1s) | C | 60 | 17.4 |
6010 | 2025-12-28 02:21:50 | MASTER-Kislovodsk | (09h 57m 07.42s , +51d 06m 00.2s) | C | 60 | 17.3 |
6529 | 2025-12-28 02:30:29 | MASTER-Kislovodsk | (10h 17m 24.80s , +48d 52m 37.6s) | C | 60 | 17.1 |
6529 | 2025-12-28 02:30:29 | MASTER-Kislovodsk | (10h 10m 29.17s , +49d 12m 12.1s) | C | 60 | 17.1 |
6625 | 2025-12-28 02:32:04 | MASTER-Kislovodsk | (09h 50m 35.30s , +52d 39m 13.1s) | C | 60 | 17.1 |
6625 | 2025-12-28 02:32:04 | MASTER-Kislovodsk | (09h 43m 06.45s , +52d 58m 20.9s) | C | 60 | 17.0 |
6721 | 2025-12-28 02:33:40 | MASTER-Kislovodsk | (10h 10m 16.53s , +52d 38m 50.2s) | C | 60 | 17.4 |
6721 | 2025-12-28 02:33:41 | MASTER-Kislovodsk | (10h 02m 46.74s , +52d 58m 01.9s) | C | 60 | 16.9 |
6817 | 2025-12-28 02:35:17 | MASTER-Kislovodsk | (09h 55m 16.58s , +46d 56m 01.5s) | C | 60 | 17.0 |
6818 | 2025-12-28 02:35:17 | MASTER-Kislovodsk | (09h 48m 38.37s , +47d 15m 51.9s) | C | 60 | 17.1 |
6917 | 2025-12-28 02:36:56 | MASTER-Kislovodsk | (10h 04m 11.56s , +50d 46m 10.2s) | C | 60 | 17.6 |
6917 | 2025-12-28 02:36:56 | MASTER-Kislovodsk | (09h 57m 00.57s , +51d 05m 34.7s) | C | 60 | 17.0 |
7013 | 2025-12-28 02:38:33 | MASTER-Kislovodsk | (09h 59m 12.42s , +48d 50m 02.1s) | C | 60 | 17.6 |
7013 | 2025-12-28 02:38:33 | MASTER-Kislovodsk | (09h 52m 19.00s , +49d 09m 39.2s) | C | 60 | 17.3 |
7112 | 2025-12-28 02:40:12 | MASTER-Kislovodsk | (09h 45m 14.59s , +50d 45m 25.6s) | C | 60 | 17.3 |
7112 | 2025-12-28 02:40:12 | MASTER-Kislovodsk | (09h 38m 05.16s , +51d 04m 52.0s) | C | 60 | 17.1 |
7211 | 2025-12-28 02:41:50 | MASTER-Kislovodsk | (10h 17m 23.46s , +48d 51m 25.4s) | C | 60 | 17.0 |
7211 | 2025-12-28 02:41:50 | MASTER-Kislovodsk | (10h 10m 28.94s , +49d 11m 03.4s) | C | 60 | 17.0 |
7303 | 2025-12-28 02:43:23 | MASTER-Kislovodsk | (09h 50m 26.54s , +52d 39m 48.9s) | C | 60 | 17.1 |
7304 | 2025-12-28 02:43:23 | MASTER-Kislovodsk | (09h 42m 58.14s , +52d 59m 02.1s) | C | 60 | 16.9 |
7400 | 2025-12-28 02:45:00 | MASTER-Kislovodsk | (10h 10m 20.94s , +52d 39m 34.4s) | C | 60 | 17.4 |
7400 | 2025-12-28 02:45:00 | MASTER-Kislovodsk | (10h 02m 51.64s , +52d 58m 42.7s) | C | 60 | 17.2 |
7497 | 2025-12-28 02:46:37 | MASTER-Kislovodsk | (10h 10m 37.66s , +52d 39m 35.2s) | C | 60 | 12.4 |
7497 | 2025-12-28 02:46:37 | MASTER-Kislovodsk | (10h 03m 48.11s , +52d 58m 42.0s) | C | 60 | 12.5 |
7596 | 2025-12-28 02:48:16 | MASTER-Kislovodsk | (10h 04m 13.05s , +50d 44m 13.4s) | C | 60 | 17.4 |
7596 | 2025-12-28 02:48:16 | MASTER-Kislovodsk | (09h 57m 03.22s , +51d 03m 35.3s) | C | 60 | 17.2 |
7688 | 2025-12-28 02:49:47 | MASTER-Kislovodsk | (09h 59m 10.08s , +48d 51m 01.6s) | C | 60 | 17.5 |
7693 | 2025-12-28 02:49:53 | MASTER-Kislovodsk | (09h 52m 17.21s , +49d 10m 37.4s) | C | 60 | 17.3 |
7789 | 2025-12-28 02:51:29 | MASTER-Kislovodsk | (09h 45m 10.11s , +50d 43m 08.7s) | C | 60 | 17.4 |
7789 | 2025-12-28 02:51:29 | MASTER-Kislovodsk | (09h 38m 01.62s , +51d 02m 36.5s) | C | 60 | 17.1 |
7886 | 2025-12-28 02:53:06 | MASTER-Kislovodsk | (10h 17m 25.04s , +48d 51m 56.3s) | C | 60 | 17.3 |
7886 | 2025-12-28 02:53:06 | MASTER-Kislovodsk | (10h 10m 30.87s , +49d 11m 36.2s) | C | 60 | 17.1 |
7982 | 2025-12-28 02:54:42 | MASTER-Kislovodsk | (09h 50m 24.96s , +52d 38m 17.5s) | C | 60 | 17.5 |
7982 | 2025-12-28 02:54:42 | MASTER-Kislovodsk | (09h 42m 57.33s , +52d 57m 33.9s) | C | 60 | 17.1 |
8081 | 2025-12-28 02:56:20 | MASTER-Kislovodsk | (10h 10m 11.14s , +52d 40m 06.1s) | C | 60 | 17.4 |
8081 | 2025-12-28 02:56:20 | MASTER-Kislovodsk | (10h 02m 42.12s , +52d 59m 17.2s) | C | 60 | 17.3 |
8180 | 2025-12-28 02:57:59 | MASTER-Kislovodsk | (09h 55m 12.19s , +46d 55m 29.4s) | C | 60 | 17.2 |
8180 | 2025-12-28 02:57:59 | MASTER-Kislovodsk | (09h 48m 35.03s , +47d 15m 37.7s) | C | 60 | 17.0 |
8586 | 2025-12-28 03:04:46 | MASTER-Kislovodsk | (10h 17m 18.67s , +48d 51m 29.6s) | C | 60 | 17.1 |
8586 | 2025-12-28 03:04:46 | MASTER-Kislovodsk | (10h 10m 24.95s , +49d 11m 15.6s) | C | 60 | 17.1 |
8683 | 2025-12-28 03:06:23 | MASTER-Kislovodsk | (09h 50m 27.29s , +52d 37m 39.4s) | C | 60 | 17.1 |
8683 | 2025-12-28 03:06:23 | MASTER-Kislovodsk | (09h 43m 00.39s , +52d 57m 00.0s) | C | 60 | 17.1 |
8780 | 2025-12-28 03:08:00 | MASTER-Kislovodsk | (10h 10m 07.36s , +52d 37m 32.7s) | C | 60 | 17.4 |
8780 | 2025-12-28 03:08:00 | MASTER-Kislovodsk | (10h 02m 39.26s , +52d 56m 48.2s) | C | 60 | 17.3 |
8878 | 2025-12-28 03:09:37 | MASTER-Kislovodsk | (10h 10m 28.03s , +52d 37m 34.5s) | C | 60 | 12.6 |
8964 | 2025-12-28 03:11:03 | MASTER-Kislovodsk | (10h 12m 23.19s , +52d 37m 37.7s) | C | 60 | 12.3 |
9055 | 2025-12-28 03:12:35 | MASTER-Kislovodsk | (10h 12m 40.99s , +46d 55m 07.8s) | C | 60 | 17.4 |
9056 | 2025-12-28 03:12:35 | MASTER-Kislovodsk | (10h 06m 03.32s , +47d 15m 13.0s) | C | 60 | 17.4 |
9149 | 2025-12-28 03:14:09 | MASTER-Kislovodsk | (10h 23m 06.85s , +50d 45m 12.8s) | C | 60 | 16.9 |
9154 | 2025-12-28 03:14:14 | MASTER-Kislovodsk | (10h 15m 55.96s , +51d 04m 45.2s) | C | 60 | 17.1 |
9252 | 2025-12-28 03:15:51 | MASTER-Kislovodsk | (09h 56m 46.97s , +54d 31m 51.5s) | C | 60 | 17.1 |
9252 | 2025-12-28 03:15:52 | MASTER-Kislovodsk | (09h 48m 58.93s , +54d 50m 53.6s) | C | 60 | 17.1 |
9346 | 2025-12-28 03:17:26 | MASTER-Kislovodsk | (09h 37m 26.63s , +46d 54m 36.9s) | C | 60 | 17.2 |
9346 | 2025-12-28 03:17:26 | MASTER-Kislovodsk | (09h 30m 52.56s , +47d 15m 10.2s) | C | 60 | 17.2 |
9444 | 2025-12-28 03:19:04 | MASTER-Kislovodsk | (10h 10m 12.18s , +52d 38m 01.4s) | C | 60 | 17.0 |
9444 | 2025-12-28 03:19:04 | MASTER-Kislovodsk | (10h 02m 44.12s , +52d 57m 20.4s) | C | 60 | 17.2 |
9532 | 2025-12-28 03:20:31 | MASTER-Kislovodsk | (10h 10m 51.42s , +52d 38m 02.1s) | C | 60 | 12.5 |
9532 | 2025-12-28 03:20:31 | MASTER-Kislovodsk | (10h 02m 52.79s , +52d 57m 16.2s) | C | 60 | 13.0 |
9727 | 2025-12-28 03:23:46 | MASTER-Kislovodsk | (10h 12m 38.78s , +46d 54m 03.4s) | C | 60 | 17.3 |
9727 | 2025-12-28 03:23:46 | MASTER-Kislovodsk | (10h 06m 01.84s , +47d 14m 22.2s) | C | 60 | 17.4 |
9838 | 2025-12-28 03:25:37 | MASTER-Kislovodsk | (10h 23m 05.28s , +50d 45m 00.9s) | C | 60 | 16.5 |
9838 | 2025-12-28 03:25:37 | MASTER-Kislovodsk | (10h 15m 55.30s , +51d 04m 37.3s) | C | 60 | 17.1 |
9938 | 2025-12-28 03:27:18 | MASTER-Kislovodsk | (09h 56m 44.01s , +54d 31m 10.7s) | C | 60 | 16.9 |
9938 | 2025-12-28 03:27:18 | MASTER-Kislovodsk | (09h 48m 57.16s , +54d 50m 21.4s) | C | 60 | 17.1 |
10035 | 2025-12-28 03:28:55 | MASTER-Kislovodsk | (10h 02m 38.82s , +45d 21m 03.2s) | C | 60 | 17.2 |
10035 | 2025-12-28 03:28:55 | MASTER-Kislovodsk | (10h 09m 00.78s , +45d 00m 24.6s) | C | 60 | 17.3 |
10131 | 2025-12-28 03:30:30 | MASTER-Kislovodsk | (10h 29m 50.64s , +52d 37m 23.2s) | C | 60 | 16.3 |
10131 | 2025-12-28 03:30:30 | MASTER-Kislovodsk | (10h 22m 22.44s , +52d 56m 41.9s) | C | 60 | 16.8 |
10425 | 2025-12-28 03:35:24 | MASTER-Kislovodsk | (10h 12m 34.39s , +46d 54m 15.9s) | C | 60 | 16.4 |
10425 | 2025-12-28 03:35:25 | MASTER-Kislovodsk | (10h 05m 58.49s , +47d 14m 53.3s) | C | 60 | 17.1 |
10525 | 2025-12-28 03:37:05 | MASTER-Kislovodsk | (10h 22m 54.27s , +50d 44m 24.8s) | C | 60 | 16.2 |
10525 | 2025-12-28 03:37:05 | MASTER-Kislovodsk | (10h 15m 45.45s , +51d 04m 05.3s) | C | 60 | 16.8 |
10625 | 2025-12-28 03:38:45 | MASTER-Kislovodsk | (10h 23m 30.87s , +47d 14m 23.6s) | C | 60 | 16.5 |
10625 | 2025-12-28 03:38:45 | MASTER-Kislovodsk | (10h 30m 07.84s , +46d 54m 02.6s) | C | 60 | 15.8 |
10723 | 2025-12-28 03:40:23 | MASTER-Kislovodsk | (10h 02m 34.91s , +45d 21m 28.3s) | C | 60 | 16.7 |
10723 | 2025-12-28 03:40:23 | MASTER-Kislovodsk | (10h 08m 55.83s , +45d 00m 49.5s) | C | 60 | 16.3 |
10822 | 2025-12-28 03:42:02 | MASTER-Kislovodsk | (10h 29m 51.19s , +52d 36m 51.2s) | C | 60 | 15.5 |
10822 | 2025-12-28 03:42:02 | MASTER-Kislovodsk | (10h 22m 23.72s , +52d 56m 14.6s) | C | 60 | 16.2 |
10919 | 2025-12-28 03:43:39 | MASTER-Kislovodsk | (10h 09m 41.91s , +54d 51m 05.3s) | C | 60 | 16.2 |
10919 | 2025-12-28 03:43:39 | MASTER-Kislovodsk | (10h 17m 29.19s , +54d 31m 54.0s) | C | 60 | 15.6 |
11205 | 2025-12-28 03:48:25 | MASTER-Kislovodsk | (10h 22m 53.42s , +50d 43m 55.8s) | C | 60 | 15.1 |
11205 | 2025-12-28 03:48:25 | MASTER-Kislovodsk | (10h 15m 44.95s , +51d 03m 36.9s) | C | 60 | 16.1 |
11323 | 2025-12-28 03:50:23 | MASTER-Kislovodsk | (10h 23m 29.69s , +47d 13m 59.1s) | C | 60 | 16.1 |
11323 | 2025-12-28 03:50:23 | MASTER-Kislovodsk | (10h 30m 06.25s , +46d 53m 23.4s) | C | 60 | 15.2 |
Filter C is a clear (unfiltred) band.
The observation and reduction will continue.
The message may be cited.
[1] - V.M. Lipunov, V.G. Kornilov, E.S. Gorbovskoy, N.A. Tiurina & A.S.Kuznetsov, 2023, Astronomical Robotic Networks and Operative Multichanel Astrophysics, Lomonosov MSU PRESS, 591pp.
http : // www.pereplet.ru/lipunov/625.html
GCN Circular 43246
Subject
GRB 251228A: Fermi GBM Final Real-time Localization
Date
2025-12-28T00:52:53Z (2 days 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 00:42:10 UT on 28 Dec 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 251228A (trigger 788575335.25706 / 251228029).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 150.2, Dec = 49.8 (J2000 degrees, equivalent to J2000 10h 00m, 49d 47'), with a statistical uncertainty of 10.7 degrees.
The angle from the Fermi LAT boresight is 107.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251228029/quicklook/glg_skymap_all_bn251228029.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/bn251228029/quicklook/glg_healpix_all_bn251228029.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn251228029/quicklook/glg_lc_medres34_bn251228029.gif