TITLE: GCN CIRCULAR NUMBER: 39474 SUBJECT: Fermi GRB 250225A: Global MASTER-Net observations report DATE: 25/02/25 21:03:06 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs lipunov@xray.sai.msu.ru
V.Lipunov, E.Gorbovskoy, N.Tiurina, P.Balanutsa, , D.Vlasenko, I.Panchenko, A.Kuznetsov, G.Antipov, A.Sankovich, A.Sosnovskij, Yu.Tselik, M.Gulyaev, 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. 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-SAAO robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) started inspect of the Fermi GRB 250225A ( Fermi GBM team, GCN 39467) errorbox 44698 sec after notice time and 44737 sec after trigger time at 2025-02-25 18:51:00 UT, with upper limit up to 19.1 mag. The observations began at zenith distance = 33 deg. The sun altitude is -19.6 deg.
The galactic latitude b = -49 deg., longitude l = 244 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2790801
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________
44768 | 2025-02-25 18:51:00 | MASTER-SAAO | (03h 54m 49.41s , -40d 48m 54.8s) | C | 60 | 18.8 | 44847 | 2025-02-25 18:52:19 | MASTER-SAAO | (04h 05m 18.27s , -40d 47m 21.7s) | C | 60 | 18.7 | 44926 | 2025-02-25 18:53:39 | MASTER-SAAO | (03h 48m 24.30s , -38d 53m 35.9s) | C | 60 | 18.5 | 45006 | 2025-02-25 18:54:58 | MASTER-SAAO | (03h 58m 33.77s , -38d 54m 13.2s) | C | 60 | 18.5 | 45085 | 2025-02-25 18:56:18 | MASTER-SAAO | (04h 01m 53.31s , -42d 42m 05.9s) | C | 60 | 18.6 | 45167 | 2025-02-25 18:57:39 | MASTER-SAAO | (04h 12m 37.11s , -42d 43m 05.4s) | C | 60 | 18.9 | 45246 | 2025-02-25 18:58:59 | MASTER-SAAO | (03h 41m 13.44s , -42d 41m 11.6s) | C | 60 | 18.8 | 45325 | 2025-02-25 19:00:18 | MASTER-SAAO | (03h 52m 04.78s , -42d 42m 33.9s) | C | 60 | 19.0 | 45423 | 2025-02-25 19:01:56 | MASTER-SAAO | (03h 54m 49.21s , -40d 47m 23.4s) | C | 60 | 18.7 | 45503 | 2025-02-25 19:03:15 | MASTER-SAAO | (04h 05m 16.54s , -40d 47m 55.2s) | C | 60 | 18.9 | 45741 | 2025-02-25 19:07:13 | MASTER-SAAO | (03h 48m 17.83s , -38d 54m 45.8s) | C | 60 | 18.6 | 45820 | 2025-02-25 19:08:33 | MASTER-SAAO | (03h 58m 39.26s , -38d 54m 26.3s) | C | 60 | 18.5 | 45900 | 2025-02-25 19:09:52 | MASTER-SAAO | (04h 01m 51.26s , -42d 40m 43.1s) | C | 60 | 18.9 | 45979 | 2025-02-25 19:11:12 | MASTER-SAAO | (04h 12m 42.31s , -42d 42m 16.8s) | C | 60 | 18.8 | 46058 | 2025-02-25 19:12:31 | MASTER-SAAO | (03h 41m 16.02s , -42d 40m 55.7s) | C | 60 | 19.1 | 46137 | 2025-02-25 19:13:50 | MASTER-SAAO | (03h 52m 03.12s , -42d 41m 27.8s) | C | 60 | 19.0 | 46217 | 2025-02-25 19:15:09 | MASTER-SAAO | (03h 54m 43.40s , -40d 46m 27.2s) | C | 60 | 18.8 | 46296 | 2025-02-25 19:16:29 | MASTER-SAAO | (04h 05m 22.17s , -40d 47m 26.6s) | C | 60 | 18.7 | 46376 | 2025-02-25 19:17:48 | MASTER-SAAO | (03h 48m 17.65s , -38d 54m 21.8s) | C | 60 | 18.5 | 46456 | 2025-02-25 19:19:08 | MASTER-SAAO | (03h 58m 39.07s , -38d 54m 08.0s) | C | 60 | 18.8 | 46535 | 2025-02-25 19:20:28 | MASTER-SAAO | (04h 01m 51.71s , -42d 40m 26.7s) | C | 60 | 18.6 | 46614 | 2025-02-25 19:21:47 | MASTER-SAAO | (04h 12m 43.06s , -42d 42m 11.9s) | C | 60 | 18.7 | 46695 | 2025-02-25 19:23:08 | MASTER-SAAO | (03h 41m 17.18s , -42d 40m 34.0s) | C | 60 | 18.6 | 46784 | 2025-02-25 19:24:37 | MASTER-SAAO | (03h 52m 01.84s , -42d 41m 05.5s) | C | 60 | 18.9 | 46863 | 2025-02-25 19:25:56 | MASTER-SAAO | (03h 54m 44.70s , -40d 46m 04.3s) | C | 60 | 18.6 | 46943 | 2025-02-25 19:27:15 | MASTER-SAAO | (04h 05m 22.62s , -40d 47m 03.2s) | C | 60 | 18.4 | 47022 | 2025-02-25 19:28:34 | MASTER-SAAO | (03h 48m 17.09s , -38d 53m 59.3s) | C | 60 | 18.5 | 47102 | 2025-02-25 19:29:55 | MASTER-SAAO | (03h 58m 38.43s , -38d 53m 36.6s) | C | 60 | 18.4 | 47182 | 2025-02-25 19:31:14 | MASTER-SAAO | (04h 01m 52.00s , -42d 39m 55.2s) | C | 60 | 18.8 | 47267 | 2025-02-25 19:32:39 | MASTER-SAAO | (04h 12m 43.40s , -42d 41m 44.3s) | C | 60 | 18.4 | 47346 | 2025-02-25 19:33:59 | MASTER-SAAO | (03h 41m 15.66s , -42d 39m 54.0s) | C | 60 | 18.7 | 47426 | 2025-02-25 19:35:18 | MASTER-SAAO | (03h 52m 01.71s , -42d 40m 43.5s) | C | 60 | 18.6 | 47505 | 2025-02-25 19:36:38 | MASTER-SAAO | (03h 54m 44.12s , -40d 45m 42.3s) | C | 60 | 18.5 | 47585 | 2025-02-25 19:37:57 | MASTER-SAAO | (04h 05m 22.69s , -40d 46m 41.4s) | C | 60 | 18.5 | 47664 | 2025-02-25 19:39:17 | MASTER-SAAO | (03h 48m 17.11s , -38d 53m 37.9s) | C | 60 | 18.3 | 47744 | 2025-02-25 19:40:36 | MASTER-SAAO | (03h 58m 38.68s , -38d 53m 36.3s) | C | 60 | 18.3 | 47823 | 2025-02-25 19:41:56 | MASTER-SAAO | (04h 01m 52.08s , -42d 39m 55.6s) | C | 60 | 18.3 | 47907 | 2025-02-25 19:43:20 | MASTER-SAAO | (04h 12m 43.76s , -42d 41m 01.5s) | C | 60 | 18.3 | 47987 | 2025-02-25 19:44:39 | MASTER-SAAO | (03h 41m 15.72s , -42d 39m 30.2s) | C | 60 | 18.6 | 48066 | 2025-02-25 19:45:58 | MASTER-SAAO | (03h 52m 02.90s , -42d 40m 21.6s) | C | 60 | 18.3 | 48145 | 2025-02-25 19:47:18 | MASTER-SAAO | (03h 54m 42.90s , -40d 45m 20.4s) | C | 60 | 17.8 | 48226 | 2025-02-25 19:48:38 | MASTER-SAAO | (04h 05m 21.63s , -40d 46m 19.8s) | C | 60 | 18.5 | 48307 | 2025-02-25 19:49:59 | MASTER-SAAO | (03h 48m 16.28s , -38d 53m 16.1s) | C | 60 | 18.0 | 48386 | 2025-02-25 19:51:18 | MASTER-SAAO | (03h 58m 38.73s , -38d 52m 47.9s) | C | 60 | 17.4 | 48465 | 2025-02-25 19:52:38 | MASTER-SAAO | (04h 01m 52.05s , -42d 39m 32.2s) | C | 60 | 17.3 | 48545 | 2025-02-25 19:53:57 | MASTER-SAAO | (04h 12m 44.00s , -42d 40m 40.8s) | C | 60 | 17.4 | 48624 | 2025-02-25 19:55:16 | MASTER-SAAO | (03h 41m 16.82s , -42d 39m 08.2s) | C | 60 | 16.4 | 48705 | 2025-02-25 19:56:38 | MASTER-SAAO | (03h 52m 01.56s , -42d 40m 01.8s) | C | 60 | 17.2 | Filter C is a clear (unfiltred) band.
The observation and reduction will continue. The message may be cited.
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