Swift GRB220412.28: Global MASTER-Net observations report

MASTER-OAGH robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Mexico (OAGH National Institute for Astrophysics, Optics and Electronics) was pointed to the Swift GRB220412.28 (trigger No 1102281,08h 15m 52.32s , +30d 19m 19.2s, R=0.05) errorbox 37 sec after notice time and 97 sec after trigger time at 2022-04-12 06:38:27 UT, with upper limit up to 14.9 mag. The observations began at zenith distance = 56 deg. The sun altitude is -49.2 deg. The galactic latitude b = 31 deg., longitude l = 192 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1940522 We obtain a following upper limits. Tmid-T0 | Site |Filt.| Expt. | Limit| Comment _________|_____________________|_____|_______|______|________ 108 | MASTER-OAGH | P- | 20 | 14.8 | 155 | MASTER-OAGH | P- | 30 | 14.9 | 211 | MASTER-OAGH | P- | 40 | 14.9 | The observation and reduction will continue. The message may be cited.