Аннотация: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 GRB 220403B ( N. J. Klingler et al., GCN 31820) errorbox 20759 sec after notice time and 20778 sec after trigger time at 2022-04-04 02:29:01 UT, with upper limit up to 17.7 mag. Observations started at twilight. The observations began at zenith distance = 59 deg. The sun altitude is -11.3 deg. The galactic latitude b = 28 deg., longitude l = 123 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1931497 We obtain a following upper limits. Tmid-T0 | Site |Filt.| Expt. | Limit| Comment |_|| 20869 | MASTER-OAGH | C | 180 | 17.2 | 20869 | MASTER-OAGH | C | 180 | 17.7 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.