Fermi GRB 241223A: 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 241223A ( Fermi GBM team, GCN 38650) errorbox 29603 sec after notice time and 29637 sec after trigger time at 2024-12-23 20:22:44 UT, with upper limit up to 18.4 mag. The observations began at zenith distance = 79 deg. The sun altitude is -25.8 deg. The galactic latitude b = 21 deg., longitude l = 275 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2719951 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 29667 | 2024-12-23 20:22:44 | MASTER-SAAO | (10h 31m 23.22s , -34d 45m 27.5s) | C | 60 | 17.9 | 31507 | 2024-12-23 20:53:23 | MASTER-SAAO | (10h 31m 16.29s , -34d 45m 04.3s) | C | 60 | 18.3 | 32074 | 2024-12-23 21:02:50 | MASTER-SAAO | (10h 40m 01.52s , -34d 44m 52.8s) | C | 60 | 18.4 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.