TITLE: GCN CIRCULAR NUMBER: 43065 SUBJECT: IceCube Alert 251210.46: Global MASTER-Net observations report DATE: 25/12/10 15:13:19 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) was pointed to the IceCube Alert 251210.46 (trigger No 43378962,02h 22m 57.84s , +20d 42m 14.4s, R=0.72) errorbox 11898 sec after notice time and 11947 sec after trigger time at 2025-12-10 14:25:22 UT, with upper limit up to 18.0 mag. Observations started at twilight. The observations began at zenith distance = 52 deg. The sun altitude is -8.9 deg. The galactic latitude b = -37 deg., longitude l = 151 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=3067269 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 12008 | 2025-12-10 14:25:22 | MASTER-Kislovodsk | (02h 19m 29.66s , +20d 34m 40.7s) | P- | 120 | 13.1 | 12008 | 2025-12-10 14:25:22 | MASTER-Kislovodsk | (02h 19m 38.74s , +20d 11m 50.3s) | P| | 120 | 15.4 | 12148 | 2025-12-10 14:27:42 | MASTER-Kislovodsk | (02h 19m 29.78s , +20d 34m 42.4s) | P- | 120 | 14.5 | 12148 | 2025-12-10 14:27:42 | MASTER-Kislovodsk | (02h 19m 38.65s , +20d 11m 54.3s) | P| | 120 | 16.8 | 12288 | 2025-12-10 14:30:02 | MASTER-Kislovodsk | (02h 19m 29.78s , +20d 34m 47.8s) | P- | 120 | 15.0 | 12288 | 2025-12-10 14:30:02 | MASTER-Kislovodsk | (02h 19m 38.50s , +20d 11m 56.8s) | P| | 120 | 17.3 | 12428 | 2025-12-10 14:32:22 | MASTER-Kislovodsk | (02h 19m 29.82s , +20d 34m 52.9s) | P- | 120 | 15.3 | 12428 | 2025-12-10 14:32:22 | MASTER-Kislovodsk | (02h 19m 38.48s , +20d 12m 01.1s) | P| | 120 | 17.4 | 12568 | 2025-12-10 14:34:42 | MASTER-Kislovodsk | (02h 19m 29.68s , +20d 34m 59.2s) | P- | 120 | 15.3 | 12568 | 2025-12-10 14:34:42 | MASTER-Kislovodsk | (02h 19m 38.42s , +20d 12m 06.0s) | P| | 120 | 17.5 | 12708 | 2025-12-10 14:37:02 | MASTER-Kislovodsk | (02h 19m 29.59s , +20d 35m 05.6s) | P- | 120 | 15.5 | 12708 | 2025-12-10 14:37:02 | MASTER-Kislovodsk | (02h 19m 38.42s , +20d 12m 11.9s) | P| | 120 | 17.5 | 12848 | 2025-12-10 14:39:22 | MASTER-Kislovodsk | (02h 19m 38.40s , +20d 12m 19.1s) | P| | 120 | 17.7 | 12848 | 2025-12-10 14:39:22 | MASTER-Kislovodsk | (02h 19m 29.44s , +20d 35m 13.4s) | P- | 120 | 15.5 | 12987 | 2025-12-10 14:41:41 | MASTER-Kislovodsk | (02h 19m 38.43s , +20d 12m 25.5s) | P| | 120 | 17.7 | 12987 | 2025-12-10 14:41:41 | MASTER-Kislovodsk | (02h 19m 29.28s , +20d 35m 20.8s) | P- | 120 | 15.4 | 13128 | 2025-12-10 14:44:01 | MASTER-Kislovodsk | (02h 19m 29.39s , +20d 35m 24.2s) | P- | 120 | 15.5 | 13128 | 2025-12-10 14:44:01 | MASTER-Kislovodsk | (02h 19m 38.43s , +20d 12m 31.5s) | P| | 120 | 17.9 | 13267 | 2025-12-10 14:46:21 | MASTER-Kislovodsk | (02h 19m 38.43s , +20d 12m 39.0s) | P| | 120 | 17.9 | 13267 | 2025-12-10 14:46:21 | MASTER-Kislovodsk | (02h 19m 29.15s , +20d 35m 34.0s) | P- | 120 | 15.5 | 13407 | 2025-12-10 14:48:41 | MASTER-Kislovodsk | (02h 19m 38.45s , +20d 12m 46.7s) | P| | 120 | 17.9 | 13407 | 2025-12-10 14:48:41 | MASTER-Kislovodsk | (02h 19m 29.08s , +20d 35m 41.2s) | P- | 120 | 15.7 | 13547 | 2025-12-10 14:51:01 | MASTER-Kislovodsk | (02h 19m 38.48s , +20d 12m 54.0s) | P| | 120 | 17.9 | 13547 | 2025-12-10 14:51:01 | MASTER-Kislovodsk | (02h 19m 28.90s , +20d 35m 48.4s) | P- | 120 | 15.7 | 13687 | 2025-12-10 14:53:21 | MASTER-Kislovodsk | (02h 19m 28.84s , +20d 35m 56.4s) | P- | 120 | 15.6 | 13687 | 2025-12-10 14:53:21 | MASTER-Kislovodsk | (02h 19m 38.55s , +20d 13m 01.8s) | P| | 120 | 17.9 | 13827 | 2025-12-10 14:55:41 | MASTER-Kislovodsk | (02h 19m 28.68s , +20d 36m 03.8s) | P- | 120 | 15.8 | 13827 | 2025-12-10 14:55:41 | MASTER-Kislovodsk | (02h 19m 38.61s , +20d 13m 09.1s) | P| | 120 | 17.8 | 13967 | 2025-12-10 14:58:01 | MASTER-Kislovodsk | (02h 19m 28.52s , +20d 36m 10.3s) | P- | 120 | 15.8 | 13967 | 2025-12-10 14:58:01 | MASTER-Kislovodsk | (02h 19m 38.69s , +20d 13m 15.4s) | P| | 120 | 17.9 | 14107 | 2025-12-10 15:00:21 | MASTER-Kislovodsk | (02h 19m 38.76s , +20d 13m 21.0s) | P| | 120 | 18.0 | 14107 | 2025-12-10 15:00:21 | MASTER-Kislovodsk | (02h 19m 28.32s , +20d 36m 15.6s) | P- | 120 | 15.6 | 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/43065. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...