Swift GRB 240904A: 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) was pointed to the Swift GRB 240904A ( M. H. Siegel et al., GCN 37383) errorbox 36516 sec after notice time and 36574 sec after trigger time at 2024-09-05 02:13:53 UT, with upper limit up to 17.3 mag. The observations began at zenith distance = 80 deg. The sun altitude is -33.8 deg. The galactic latitude b = 11 deg., longitude l = 256 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2589299 We obtain a following upper limits. Tmid-T0 | Site |Filt.| Expt. | Limit| Comment _________|_____________________|_____|_______|______|________ 36664 | MASTER-SAAO | C | 180 | 17.3 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.