Fermi GRB 240115B: 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 240115B ( Fermi GBM team, GCN 35540) errorbox 12811 sec after notice time and 12818 sec after trigger time at 2024-01-15 20:19:16 UT, with upper limit up to 16.3 mag. The observations began at zenith distance = 87 deg. The sun altitude is -26.0 deg. The galactic latitude b = 28 deg., longitude l = 299 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2356581 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 12909 | 2024-01-15 20:19:16 | MASTER-SAAO | (12h 43m 33.54s , -35d 23m 00.7s) | C | 180 | 16.3 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.