TITLE: GCN CIRCULAR NUMBER: 43243 SUBJECT: SVOM GRB251227.07: Global MASTER-Net observations report DATE: 25/12/27 03:56:36 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru> 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 SVOM GRB251227.07 (trigger No 1766799801,08h 24m 32.81s , +02d 47m 22.9s, R=1) errorbox 13 sec after notice time and 47 sec after trigger time at 2025-12-27 01:44:08 UT, with upper limit up to 16.9 mag. The observations began at zenith distance = 52 deg. The sun altitude is -31.3 deg. MASTER-OAFA robotic telescope located in Argentina (OAFA observatory of San Juan National University) started inspect of the SVOM GRB251227.07 errorbox 107 sec after notice time and 141 sec after trigger time at 2025-12-27 01:45:42 UT, with upper limit up to 19.4 mag. The observations began at zenith distance = 77 deg. The sun altitude is -22.1 deg. The galactic latitude b = 22 deg., longitude l = 222 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=3086623 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 52 | 2025-12-27 01:44:08 | MASTER-Kislovodsk | (08h 23m 49.79s , +02d 54m 44.7s) | P- | 10 | 15.5 | 52 | 2025-12-27 01:44:08 | MASTER-Kislovodsk | (08h 23m 44.07s , +03d 16m 39.6s) | P| | 10 | 13.5 | 92 | 2025-12-27 01:44:42 | MASTER-Kislovodsk | (08h 24m 08.87s , +02d 54m 43.9s) | P- | 20 | 12.4 | 141 | 2025-12-27 01:45:27 | MASTER-Kislovodsk | (08h 24m 38.91s , +02d 54m 44.1s) | P- | 30 | 12.2 | 156 | 2025-12-27 01:45:42 | MASTER-OAFA | (08h 24m 30.53s , +02d 53m 39.1s) | C | 30 | 14.0 | 197 | 2025-12-27 01:46:18 | MASTER-OAFA | (08h 24m 30.76s , +02d 53m 43.8s) | C | 40 | 14.5 | 244 | 2025-12-27 01:47:05 | MASTER-OAFA | (08h 24m 30.96s , +02d 53m 48.7s) | C | 40 | 15.1 | 295 | 2025-12-27 01:47:51 | MASTER-OAFA | (08h 24m 31.13s , +02d 53m 53.9s) | C | 50 | 15.6 | 336 | 2025-12-27 01:48:26 | MASTER-Kislovodsk | (08h 24m 06.38s , +03d 13m 43.2s) | C | 60 | 16.7 | 336 | 2025-12-27 01:48:26 | MASTER-Kislovodsk | (08h 20m 01.59s , +03d 34m 00.8s) | C | 60 | 16.9 | 361 | 2025-12-27 01:48:47 | MASTER-OAFA | (08h 24m 31.36s , +02d 54m 00.5s) | C | 70 | 16.1 | 443 | 2025-12-27 01:50:03 | MASTER-OAFA | (08h 24m 31.60s , +02d 54m 07.7s) | C | 80 | 16.4 | 539 | 2025-12-27 01:51:29 | MASTER-OAFA | (08h 24m 31.92s , +02d 54m 16.2s) | C | 100 | 16.8 | 655 | 2025-12-27 01:53:15 | MASTER-OAFA | (08h 24m 32.18s , +02d 54m 25.7s) | C | 120 | 17.1 | 791 | 2025-12-27 01:55:21 | MASTER-OAFA | (08h 24m 32.48s , +02d 54m 36.5s) | C | 140 | 17.3 | 953 | 2025-12-27 01:57:48 | MASTER-OAFA | (08h 24m 32.88s , +02d 54m 49.4s) | C | 170 | 17.5 | 1074 | 2025-12-27 02:00:44 | MASTER-OAFA | (08h 24m 33.15s , +02d 54m 58.8s) | C | 60 | 17.7 | 1139 | 2025-12-27 02:01:50 | MASTER-OAFA | (08h 24m 33.27s , +02d 55m 03.5s) | C | 60 | 17.9 | 1205 | 2025-12-27 02:02:55 | MASTER-OAFA | (08h 24m 33.41s , +02d 55m 08.5s) | C | 60 | 17.9 | 1271 | 2025-12-27 02:04:01 | MASTER-OAFA | (08h 24m 33.56s , +02d 55m 13.6s) | C | 60 | 18.0 | 1336 | 2025-12-27 02:05:06 | MASTER-OAFA | (08h 24m 33.67s , +02d 55m 18.3s) | C | 60 | 18.0 | 1401 | 2025-12-27 02:06:12 | MASTER-OAFA | (08h 24m 33.79s , +02d 55m 23.2s) | C | 60 | 18.1 | 1467 | 2025-12-27 02:07:17 | MASTER-OAFA | (08h 24m 33.91s , +02d 55m 28.1s) | C | 60 | 18.1 | 1532 | 2025-12-27 02:08:23 | MASTER-OAFA | (08h 24m 34.04s , +02d 55m 33.0s) | C | 60 | 18.2 | 1598 | 2025-12-27 02:09:28 | MASTER-OAFA | (08h 24m 34.15s , +02d 55m 37.9s) | C | 60 | 18.3 | 1664 | 2025-12-27 02:10:34 | MASTER-OAFA | (08h 24m 34.25s , +02d 55m 42.5s) | C | 60 | 18.4 | 1729 | 2025-12-27 02:11:40 | MASTER-OAFA | (08h 24m 34.40s , +02d 55m 47.4s) | C | 60 | 18.4 | 1795 | 2025-12-27 02:12:45 | MASTER-OAFA | (08h 24m 34.55s , +02d 55m 52.2s) | C | 60 | 18.4 | 1861 | 2025-12-27 02:13:51 | MASTER-OAFA | (08h 24m 34.63s , +02d 55m 56.7s) | C | 60 | 18.4 | 1926 | 2025-12-27 02:14:57 | MASTER-OAFA | (08h 24m 34.75s , +02d 56m 01.5s) | C | 60 | 18.5 | 1991 | 2025-12-27 02:16:02 | MASTER-OAFA | (08h 24m 34.86s , +02d 56m 05.9s) | C | 60 | 18.4 | 2061 | 2025-12-27 02:17:12 | MASTER-OAFA | (08h 24m 34.97s , +02d 56m 10.6s) | C | 60 | 18.5 | 2126 | 2025-12-27 02:18:17 | MASTER-OAFA | (08h 24m 35.09s , +02d 56m 15.1s) | C | 60 | 18.4 | 2192 | 2025-12-27 02:19:23 | MASTER-OAFA | (08h 24m 35.17s , +02d 56m 19.3s) | C | 60 | 18.6 | 2259 | 2025-12-27 02:20:29 | MASTER-OAFA | (08h 24m 35.30s , +02d 56m 24.0s) | C | 60 | 18.6 | 2324 | 2025-12-27 02:21:34 | MASTER-OAFA | (08h 24m 35.41s , +02d 56m 28.3s) | C | 60 | 18.6 | 2390 | 2025-12-27 02:22:40 | MASTER-OAFA | (08h 24m 35.47s , +02d 56m 32.6s) | C | 60 | 18.6 | 2456 | 2025-12-27 02:23:46 | MASTER-OAFA | (08h 24m 35.57s , +02d 56m 36.9s) | C | 60 | 18.7 | 2521 | 2025-12-27 02:24:52 | MASTER-OAFA | (08h 24m 35.68s , +02d 56m 41.3s) | C | 60 | 18.6 | 2586 | 2025-12-27 02:25:57 | MASTER-OAFA | (08h 24m 35.77s , +02d 56m 45.7s) | C | 60 | 18.6 | 2653 | 2025-12-27 02:27:03 | MASTER-OAFA | (08h 24m 35.87s , +02d 56m 49.9s) | C | 60 | 18.7 | 2718 | 2025-12-27 02:28:09 | MASTER-OAFA | (08h 24m 35.96s , +02d 56m 54.2s) | C | 60 | 18.7 | 2784 | 2025-12-27 02:29:14 | MASTER-OAFA | (08h 24m 36.07s , +02d 56m 58.5s) | C | 60 | 18.7 | 2850 | 2025-12-27 02:30:20 | MASTER-OAFA | (08h 24m 36.16s , +02d 57m 02.6s) | C | 60 | 18.7 | 2916 | 2025-12-27 02:31:26 | MASTER-OAFA | (08h 24m 36.25s , +02d 57m 06.7s) | C | 60 | 18.7 | 2981 | 2025-12-27 02:32:31 | MASTER-OAFA | (08h 24m 36.33s , +02d 57m 10.7s) | C | 60 | 18.8 | 3048 | 2025-12-27 02:33:38 | MASTER-OAFA | (08h 24m 36.42s , +02d 57m 14.8s) | C | 60 | 18.8 | 3113 | 2025-12-27 02:34:43 | MASTER-OAFA | (08h 24m 36.49s , +02d 57m 18.6s) | C | 60 | 18.9 | 3178 | 2025-12-27 02:35:49 | MASTER-OAFA | (08h 24m 36.57s , +02d 57m 22.4s) | C | 60 | 18.9 | 3244 | 2025-12-27 02:36:55 | MASTER-OAFA | (08h 24m 36.65s , +02d 57m 26.4s) | C | 60 | 18.8 | 3310 | 2025-12-27 02:38:01 | MASTER-OAFA | (08h 24m 36.72s , +02d 57m 30.5s) | C | 60 | 18.9 | 3376 | 2025-12-27 02:39:06 | MASTER-OAFA | (08h 24m 36.78s , +02d 57m 34.2s) | C | 60 | 18.9 | 3442 | 2025-12-27 02:40:13 | MASTER-OAFA | (08h 24m 36.85s , +02d 57m 38.0s) | C | 60 | 18.8 | 3507 | 2025-12-27 02:41:18 | MASTER-OAFA | (08h 24m 36.91s , +02d 57m 41.8s) | C | 60 | 18.9 | 3572 | 2025-12-27 02:42:23 | MASTER-OAFA | (08h 24m 36.98s , +02d 57m 45.5s) | C | 60 | 18.9 | 3638 | 2025-12-27 02:43:29 | MASTER-OAFA | (08h 24m 37.06s , +02d 57m 49.3s) | C | 60 | 18.9 | 3704 | 2025-12-27 02:44:34 | MASTER-OAFA | (08h 24m 37.10s , +02d 57m 53.0s) | C | 60 | 18.9 | 3769 | 2025-12-27 02:45:40 | MASTER-OAFA | (08h 24m 37.15s , +02d 57m 56.6s) | C | 60 | 18.9 | 3838 | 2025-12-27 02:46:49 | MASTER-OAFA | (08h 24m 37.22s , +02d 58m 00.5s) | C | 60 | 19.0 | 3904 | 2025-12-27 02:47:54 | MASTER-OAFA | (08h 24m 37.27s , +02d 58m 04.1s) | C | 60 | 18.9 | 3969 | 2025-12-27 02:49:00 | MASTER-OAFA | (08h 24m 37.34s , +02d 58m 07.8s) | C | 60 | 18.9 | 4035 | 2025-12-27 02:50:05 | MASTER-OAFA | (08h 24m 37.39s , +02d 58m 11.4s) | C | 60 | 18.9 | 4100 | 2025-12-27 02:51:11 | MASTER-OAFA | (08h 24m 37.44s , +02d 58m 14.8s) | C | 60 | 19.0 | 4166 | 2025-12-27 02:52:16 | MASTER-OAFA | (08h 24m 37.50s , +02d 58m 18.2s) | C | 60 | 19.0 | 4232 | 2025-12-27 02:53:22 | MASTER-OAFA | (08h 24m 37.55s , +02d 58m 21.4s) | C | 60 | 19.0 | 4297 | 2025-12-27 02:54:28 | MASTER-OAFA | (08h 24m 37.58s , +02d 58m 24.7s) | C | 60 | 19.0 | 4363 | 2025-12-27 02:55:33 | MASTER-OAFA | (08h 24m 37.62s , +02d 58m 27.9s) | C | 60 | 19.1 | 4428 | 2025-12-27 02:56:39 | MASTER-OAFA | (08h 24m 37.67s , +02d 58m 31.2s) | C | 60 | 19.1 | 4494 | 2025-12-27 02:57:44 | MASTER-OAFA | (08h 24m 37.71s , +02d 58m 34.4s) | C | 60 | 19.0 | 4559 | 2025-12-27 02:58:50 | MASTER-OAFA | (08h 24m 37.75s , +02d 58m 37.5s) | C | 60 | 19.1 | 4626 | 2025-12-27 02:59:57 | MASTER-OAFA | (08h 24m 37.78s , +02d 58m 40.7s) | C | 60 | 19.0 | 4692 | 2025-12-27 03:01:02 | MASTER-OAFA | (08h 24m 37.82s , +02d 58m 43.9s) | C | 60 | 19.1 | 4757 | 2025-12-27 03:02:08 | MASTER-OAFA | (08h 24m 37.84s , +02d 58m 47.0s) | C | 60 | 19.1 | 4823 | 2025-12-27 03:03:14 | MASTER-OAFA | (08h 24m 37.87s , +02d 58m 49.9s) | C | 60 | 19.1 | 4888 | 2025-12-27 03:04:19 | MASTER-OAFA | (08h 24m 37.91s , +02d 58m 52.8s) | C | 60 | 19.1 | 4954 | 2025-12-27 03:05:24 | MASTER-OAFA | (08h 24m 37.93s , +02d 58m 55.8s) | C | 60 | 19.1 | 5020 | 2025-12-27 03:06:30 | MASTER-OAFA | (08h 24m 37.96s , +02d 58m 58.7s) | C | 60 | 19.1 | 5085 | 2025-12-27 03:07:36 | MASTER-OAFA | (08h 24m 38.00s , +02d 59m 01.7s) | C | 60 | 19.1 | 5151 | 2025-12-27 03:08:41 | MASTER-OAFA | (08h 24m 38.00s , +02d 59m 04.3s) | C | 60 | 19.1 | 5217 | 2025-12-27 03:09:48 | MASTER-OAFA | (08h 24m 38.01s , +02d 59m 07.0s) | C | 60 | 19.1 | 5283 | 2025-12-27 03:10:53 | MASTER-OAFA | (08h 24m 38.04s , +02d 59m 09.9s) | C | 60 | 19.2 | 5348 | 2025-12-27 03:11:59 | MASTER-OAFA | (08h 24m 38.07s , +02d 59m 12.4s) | C | 60 | 19.1 | 5415 | 2025-12-27 03:13:05 | MASTER-OAFA | (08h 24m 38.09s , +02d 59m 15.0s) | C | 60 | 19.2 | 5480 | 2025-12-27 03:14:11 | MASTER-OAFA | (08h 24m 38.10s , +02d 59m 17.7s) | C | 60 | 19.1 | 5546 | 2025-12-27 03:15:16 | MASTER-OAFA | (08h 24m 38.10s , +02d 59m 20.4s) | C | 60 | 19.1 | 5613 | 2025-12-27 03:16:24 | MASTER-OAFA | (08h 24m 38.08s , +02d 59m 22.7s) | C | 60 | 19.2 | 5679 | 2025-12-27 03:17:29 | MASTER-OAFA | (08h 24m 38.08s , +02d 59m 25.1s) | C | 60 | 19.2 | 5744 | 2025-12-27 03:18:34 | MASTER-OAFA | (08h 24m 38.09s , +02d 59m 27.5s) | C | 60 | 19.2 | 5810 | 2025-12-27 03:19:40 | MASTER-OAFA | (08h 24m 38.09s , +02d 59m 29.9s) | C | 60 | 19.2 | 5876 | 2025-12-27 03:20:46 | MASTER-OAFA | (08h 24m 38.09s , +02d 59m 32.1s) | C | 60 | 19.2 | 5941 | 2025-12-27 03:21:52 | MASTER-OAFA | (08h 24m 38.07s , +02d 59m 34.4s) | C | 60 | 19.3 | 6007 | 2025-12-27 03:22:58 | MASTER-OAFA | (08h 24m 38.05s , +02d 59m 36.7s) | C | 60 | 19.3 | 6073 | 2025-12-27 03:24:04 | MASTER-OAFA | (08h 24m 38.03s , +02d 59m 39.0s) | C | 60 | 19.2 | 6139 | 2025-12-27 03:25:09 | MASTER-OAFA | (08h 24m 38.01s , +02d 59m 41.2s) | C | 60 | 19.3 | 6205 | 2025-12-27 03:26:15 | MASTER-OAFA | (08h 24m 37.99s , +02d 59m 43.3s) | C | 60 | 19.3 | 6270 | 2025-12-27 03:27:20 | MASTER-OAFA | (08h 24m 37.98s , +02d 59m 45.5s) | C | 60 | 19.3 | 6335 | 2025-12-27 03:28:26 | MASTER-OAFA | (08h 24m 37.94s , +02d 59m 47.5s) | C | 60 | 19.3 | 6401 | 2025-12-27 03:29:31 | MASTER-OAFA | (08h 24m 37.94s , +02d 59m 49.7s) | C | 60 | 19.3 | 6466 | 2025-12-27 03:30:36 | MASTER-OAFA | (08h 24m 37.93s , +02d 59m 51.8s) | C | 60 | 19.3 | 6531 | 2025-12-27 03:31:42 | MASTER-OAFA | (08h 24m 37.90s , +02d 59m 53.7s) | C | 60 | 19.3 | 6597 | 2025-12-27 03:32:48 | MASTER-OAFA | (08h 24m 37.86s , +02d 59m 55.7s) | C | 60 | 19.3 | 6663 | 2025-12-27 03:33:53 | MASTER-OAFA | (08h 24m 37.82s , +02d 59m 57.5s) | C | 60 | 19.3 | 6728 | 2025-12-27 03:34:59 | MASTER-OAFA | (08h 24m 37.78s , +02d 59m 59.3s) | C | 60 | 19.3 | 6794 | 2025-12-27 03:36:05 | MASTER-OAFA | (08h 24m 37.74s , +03d 00m 01.2s) | C | 60 | 19.3 | 6859 | 2025-12-27 03:37:10 | MASTER-OAFA | (08h 24m 37.70s , +03d 00m 03.1s) | C | 60 | 19.3 | 6925 | 2025-12-27 03:38:15 | MASTER-OAFA | (08h 24m 37.65s , +03d 00m 04.7s) | C | 60 | 19.4 | 6991 | 2025-12-27 03:39:21 | MASTER-OAFA | (08h 24m 37.61s , +03d 00m 06.5s) | C | 60 | 19.4 | 7056 | 2025-12-27 03:40:27 | MASTER-OAFA | (08h 24m 37.56s , +03d 00m 07.9s) | C | 60 | 19.4 | 7122 | 2025-12-27 03:41:33 | MASTER-OAFA | (08h 24m 37.53s , +03d 00m 09.5s) | C | 60 | 19.3 | 7188 | 2025-12-27 03:42:39 | MASTER-OAFA | (08h 24m 37.47s , +03d 00m 10.9s) | C | 60 | 19.3 | 7254 | 2025-12-27 03:43:44 | MASTER-OAFA | (08h 24m 37.42s , +03d 00m 12.3s) | C | 60 | 19.3 | 7320 | 2025-12-27 03:44:50 | MASTER-OAFA | (08h 24m 37.37s , +03d 00m 13.7s) | C | 60 | 19.3 | 7442 | 2025-12-27 03:46:53 | MASTER-OAFA | (08h 24m 37.49s , +03d 02m 16.4s) | C | 60 | 18.5 | 7508 | 2025-12-27 03:47:58 | MASTER-OAFA | (08h 24m 37.46s , +03d 02m 17.6s) | C | 60 | 19.4 | 7573 | 2025-12-27 03:49:04 | MASTER-OAFA | (08h 24m 37.40s , +03d 02m 18.7s) | C | 60 | 19.3 | 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 View this GCN Circular online at https://gcn.nasa.gov/circulars/43243. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...