Swift GRB221009.59: Global MASTER-Net OT detection

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 Alert 221009.59 4 days 14701 sec after notice time and 12216 sec after trigger time at 2022-10-09 17:33:54 UT. On our 4-th (180s exposure) set , obtained 13707 sec after tigger time at 2022-10-09 17:58:45 UT, we found 1 optical transient within MASTER error-box (ra=288.262 dec=19.8028 r=0.05) brighter than 16.7. T-Tmid Date Time Expt. Ra Dec Mag ---------|---------------------|-------|-----------------|-----------------|------- 13797 2022-10-09 17:58:45 180 (19h 13m 03.43s , +19d 46m 23.1s) 16.7 The 5-sigma upper limit has been about 16.7mag The message may be cited.