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 GRB220526.48 (trigger No 1108021,16h 19m 31.90s , -15d 49m 35.0s, R=0.05) errorbox 16 sec after notice time and 203 sec after trigger time at 2022-05-26 11:32:14 UT, with upper limit up to 16.2 mag. Observations started at twilight. The observations began at zenith distance = 76 deg. The sun altitude is -9.4 deg. The galactic latitude b = 23 deg., longitude l = 359 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1986321 We obtain a following upper limits. Tmid-T0 | Site |Filt.| Expt. | Limit| Comment |_|| 224 | MASTER-OAGH | C | 40 | 16.2 | 224 | MASTER-OAGH | P- | 40 | 15.4 | 290 | MASTER-OAGH | P- | 50 | 15.0 | 290 | MASTER- OAGH | C | 50 | 14.6 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.