TITLE: GCN CIRCULAR NUMBER: 31651 SUBJECT: IceCube Alert 220225.59: Global MASTER-Net observations report DATE: 22/02/25 22:39:26 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-Kislovodsk robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the IceCube Alert 220225.59 (trigger No 14203460,02h 15m 02.88s , -00d 11m 49.2s, R=2.02) errorbox 6700 sec after notice time and 6742 sec after trigger time at 2022-02-25 16:04:23 UT, with upper limit up to 16.5 mag. Observations started at twilight. The observations began at zenith distance = 58 deg. The sun altitude is -13.6 deg. The galactic latitude b = -56 deg., longitude l = 164 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1894311 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 6833 | 2022-02-25 16:04:23 | MASTER-Kislovodsk | (02h 15m 10.26s , +00d 23m 09.9s) | C | 180 | 15.1 | 7038 | 2022-02-25 16:07:48 | MASTER-Kislovodsk | (02h 15m 13.62s , +00d 24m 27.2s) | C | 180 | 13.7 | 7250 | 2022-02-25 16:11:20 | MASTER-Kislovodsk | (02h 15m 07.96s , +00d 23m 37.5s) | C | 180 | 13.4 | 7403 | 2022-02-25 16:14:53 | MASTER-Kislovodsk | (02h 13m 14.49s , +03d 30m 33.1s) | C | 60 | 14.7 | 7484 | 2022-02-25 16:16:14 | MASTER-Kislovodsk | (02h 13m 10.23s , -00d 18m 34.4s) | C | 60 | 14.3 | 7564 | 2022-02-25 16:17:34 | MASTER-Kislovodsk | (02h 13m 03.20s , +01d 34m 23.3s) | C | 60 | 14.6 | 7644 | 2022-02-25 16:18:54 | MASTER-Kislovodsk | (02h 13m 26.40s , -02d 13m 36.2s) | C | 60 | 14.6 | 8331 | 2022-02-25 16:29:21 | MASTER-Kislovodsk | (02h 11m 27.68s , +00d 11m 30.0s) | C | 180 | 14.2 | 8471 | 2022-02-25 16:32:41 | MASTER-Kislovodsk | (02h 13m 23.54s , +03d 30m 15.0s) | C | 60 | 12.4 | 8611 | 2022-02-25 16:34:01 | MASTER-Kislovodsk | (02h 11m 32.91s , +00d 11m 14.9s) | C | 180 | 12.1 | 9895 | 2022-02-25 16:55:26 | MASTER-Kislovodsk | (02h 18m 20.71s , +02d 08m 22.6s) | C | 180 | 16.5 | 13552 | 2022-02-25 17:56:22 | MASTER-Kislovodsk | (02h 18m 22.06s , +02d 06m 48.2s) | C | 180 | 16.0 | 15122 | 2022-02-25 18:22:32 | MASTER-Kislovodsk | (02h 15m 34.58s , +00d 19m 13.7s) | C | 180 | 15.4 | 15323 | 2022-02-25 18:25:53 | MASTER-Kislovodsk | (02h 15m 38.52s , +00d 20m 36.8s) | C | 180 | 14.5 | 15659 | 2022-02-25 18:31:29 | MASTER-Kislovodsk | (02h 15m 30.04s , +02d 20m 34.3s) | C | 180 | 15.3 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.