TITLE: GCN CIRCULAR NUMBER: 31764 SUBJECT: IceCube-220317A: MASTER Global Robotic Net optical observations DATE: 22/03/17 19:12:15 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V.Lipunov, A.Kuznetsov, O.Gress,E.Gorbovskoy, N.Tyurina, P.Balanutsa, K.Zhirkov, A.Chasovnikov, D.Vlasenko, G.Antipov, V.Senik, D.Kuvshinov, V.Topolev, Ya.Kechin, Yu.Tselik (Lomonosov Moscow State University, SAI, Physics Department), C.Francile, R. Podesta, C.Lopez, F. Podesta (Observatorio Astronomico Felix Aguilar OAFA), D.A.H.Buckley (SAAO), R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias), L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory), N.M.Budnev (ISU,API), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A. Gabovich, V.Yurkov (Blagoveschensk Educational State University) MASTER-OAFA robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Argentina (OAFA observatory of San Juan National University) started inspect of the ICECUBE Alert 220317A (The IceCube Collaboration GCN 31762, trigger No 11435033,10h 22m 57.60s , +11d 11m 24.0s, R=1.59)errorbox 18 sec after notice time (90 sec after trigger time) at 2022-03-17 02:33:47 UT, with upper limit up to 14.4 mag. The observations began at zenith distance = 44 deg. The sun altitude is -45.2 deg. The distance to full Moon was 8 degrees (Lunar disk: 0.98). MASTER-OAGH robotic telescope located in Mexico (OAGH National Institute for Astrophysics, Optics and Electronics) started inspect of the ICECUBE-220317A alert errorbox 173 sec after notice time and 244 sec after trigger time at 2022-03-17 02:36:22 UT, with upper limit up to 16.4 mag. Observations started at twilight at zenith distance = 52 deg. The sun altitude was -15.5 deg. The galactic latitude b = 52 deg., longitude l = 231 deg. Real time updated cover map is available here: https://master.sai.msu.ru/site/master2/observ.php?id=1913174 We obtain a following upper limits at first images: Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 100 | 2022-03-17 02:33:47 | MASTER-OAFA | (10h 21m 41.33s , +12d 08m 25.8s) | C | 20 | 14.4 | 140 | 2022-03-17 02:34:27 | MASTER-OAFA | (10h 21m 41.73s , +12d 09m 27.3s) | C | 20 | 14.4 | 270 | 2022-03-17 02:36:22 | MASTER-OAGH | (10h 22m 01.10s , +10d 54m 38.4s) | P- | 50 | 13.4 | 437 | 2022-03-17 02:38:54 | MASTER-OAGH | (10h 22m 01.18s , +10d 53m 46.9s) | P- | 80 | 13.6 | 548 | 2022-03-17 02:40:35 | MASTER-OAGH | (10h 21m 58.29s , +10d 55m 03.7s) | P- | 100 | 14.0 | 679 | 2022-03-17 02:42:36 | MASTER-OAGH | (10h 21m 58.26s , +10d 53m 47.3s) | P- | 120 | 13.6 | We didn't detect bright outburst of 4FGL J1018.9+1043 at wide-field alert images, but we detected outburst in MASTER archive data at 2011-03-24 13:05:05UT with unfiltered m_BLA = 18.9m. The analysis of wide-field and very wide field MASTER images and observations will be continued. Additional observations are planned.