Fermi GRB 220617A: Global MASTER-Net observations report

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) started inspect of the Fermi GRB 220617A ( Fermi GBM team, GCN 32209) errorbox 565 sec after notice time and 600 sec after trigger time at 2022-06-17 18:41:13 UT, with upper limit up to 17.8 mag. The observations began at zenith distance = 72 deg. The sun altitude is -37.2 deg. The galactic latitude b = 56 deg., longitude l = 216 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2008774 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 661 | 2022-06-17 18:41:13 | MASTER-SAAO | (10h 22m 17.52s , +21d 18m 28.6s) | C | 120 | 16.9 | 826 | 2022-06-17 18:41:13 | MASTER-SAAO | (10h 22m 18.15s , +21d 18m 33.0s) | C | 450 | 17.8 | Coadd 843 | 2022-06-17 18:44:01 | MASTER-SAAO | (10h 22m 23.41s , +21d 20m 08.9s) | C | 150 | 17.2 | 1040 | 2022-06-17 18:47:02 | MASTER-SAAO | (10h 22m 18.64s , +21d 19m 26.5s) | C | 180 | 17.1 | 1914 | 2022-06-17 19:02:36 | MASTER-SAAO | (10h 18m 16.82s , +22d 17m 11.7s) | C | 60 | 15.8 | 2005 | 2022-06-17 19:04:08 | MASTER-SAAO | (10h 26m 56.39s , +22d 16m 07.7s) | C | 60 | 16.2 | 2093 | 2022-06-17 19:05:35 | MASTER-SAAO | (10h 10m 34.70s , +20d 21m 52.6s) | C | 60 | 14.0 | 2184 | 2022-06-17 19:07:06 | MASTER-SAAO | (10h 18m 58.19s , +20d 23m 01.3s) | C | 60 | 16.0 | 2884 | 2022-06-17 19:18:46 | MASTER-SAAO | (10h 26m 42.09s , +20d 21m 46.5s) | C | 60 | 14.8 | 2976 | 2022-06-17 19:20:18 | MASTER-SAAO | (10h 35m 11.11s , +20d 23m 25.2s) | C | 60 | 16.1 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.