TITLE: GCN CIRCULAR NUMBER: 32276 SUBJECT: IceCube Alert 220627.74: Global MASTER-Net observations report DATE: 22/06/27 18:13:20 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, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin (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), L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A. Gabovich, V.Yurkov (Blagoveschensk Educational State University) 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) was pointed to the IceCube Alert 220627.74 (trigger No 22443736,11h 01m 41.52s , +05d 00m 00.0s, R=0.51) errorbox 47 sec after notice time and 88 sec after trigger time at 2022-06-27 17:53:22 UT, with upper limit up to 19.8 mag. The observations began at zenith distance = 53 deg. The sun altitude is -26.7 deg. The galactic latitude b = 56 deg., longitude l = 249 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2016799 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 98 | 2022-06-27 17:53:22 | MASTER-SAAO | (11h 00m 26.09s , +05d 08m 58.7s) | C | 20 | 18.8 | 123 | 2022-06-27 17:53:22 | MASTER-SAAO | (11h 00m 26.09s , +05d 08m 58.7s) | C | 70 | 19.4 | Coadd 138 | 2022-06-27 17:54:01 | MASTER-SAAO | (11h 00m 32.45s , +05d 07m 59.8s) | C | 20 | 18.7 | 182 | 2022-06-27 17:54:41 | MASTER-SAAO | (11h 00m 27.24s , +05d 07m 01.7s) | C | 30 | 18.9 | 237 | 2022-06-27 17:55:31 | MASTER-SAAO | (11h 00m 32.82s , +05d 07m 05.1s) | C | 40 | 19.1 | 297 | 2022-06-27 17:55:31 | MASTER-SAAO | (11h 00m 32.82s , +05d 07m 05.0s) | C | 160 | 19.8 | Coadd 312 | 2022-06-27 17:56:40 | MASTER-SAAO | (11h 00m 29.29s , +05d 09m 05.6s) | C | 50 | 19.2 | 391 | 2022-06-27 17:57:50 | MASTER-SAAO | (11h 00m 29.00s , +05d 07m 38.4s) | C | 70 | 19.4 | 502 | 2022-06-27 17:59:31 | MASTER-SAAO | (11h 00m 31.52s , +05d 09m 10.1s) | C | 90 | 19.4 | 633 | 2022-06-27 18:01:32 | MASTER-SAAO | (11h 00m 25.31s , +05d 08m 18.2s) | C | 110 | 19.4 | 790 | 2022-06-27 18:03:54 | MASTER-SAAO | (11h 00m 24.43s , +05d 09m 23.7s) | C | 140 | 19.2 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.