TITLE: GCN CIRCULAR NUMBER: 31304 SUBJECT: MAXI GRB211225.14: Global MASTER-Net observations report DATE: 21/12/25 05:34:06 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko, G.Antipov, D.Zimnukhov, V.Senik, T.Pogrosheva, E.Minkina, A.Chasovnikov, V.Topolev, V.Grinshpun, D.Kuvshinov, D. Cheryasov (Lomonosov Moscow State University, SAI, Physics Department), R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico Felix Aguilar OAFA), R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias), D. Buckley (South African Astronomical Observatory), O.A. Gres, N.M. Budnev (Irkutsk State University, API), B.L.Carrasco, J.R.Valdes,V.Chavushyan, C.J.Martinez, V.M.Patino Alvarez, M.L.H.Rodriguez (INAOE, OAGH) A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A. Gabovich, V.Yurkov (Blagoveschensk Educational State University) MASTER-IAC robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Spain (IAC Teide Observatory) started inspect of the MAXI GRB211225.14 (trigger No 573117444,08h 27m 42.24s , -07d 10m 37.2s, R=1) errorbox 1254 sec after notice time and 5558 sec after trigger time at 2021-12-25 04:55:16 UT, with upper limit up to 17.9 mag. The observations began at zenith distance = 43 deg. The sun altitude is -37.9 deg. The galactic latitude b = 18 deg., longitude l = 231 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1826591 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 5649 | 2021-12-25 04:55:16 | MASTER-IAC | (08h 25m 29.91s , -07d 05m 23.5s) | P| | 180 | 17.9 | 5649 | 2021-12-25 04:55:16 | MASTER-IAC | (08h 26m 26.13s , -07d 11m 22.7s) | P- | 180 | 17.4 | The observation and reduction will continue. The message may be cited.