Fermi trigger No 747553301: Global MASTER-Net observations report

MASTER-Tunka robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Applied Physics Institute, Irkutsk State University) started inspect of the Fermi GRB240909.24 (trigger No 747553301,03h 30m 28.08s , +19d 15m 00.0s, R=50) errorbox 34872 sec after notice time and 34904 sec after trigger time at 2024-09-09 15:23:21 UT, with upper limit up to 16.7 mag. The observations began at zenith distance = 60 deg. The sun altitude is -29.9 deg. The galactic latitude b = -29 deg., longitude l = 167 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2595263 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 34934 | 2024-09-09 15:23:21 | MASTER-Tunka | (00h 56m 24.44s , +07d 52m 19.7s) | C | 60 | 16.7 | Coadd 34927 | 2024-09-09 15:23:43 | MASTER-Tunka | (00h 43m 23.73s , +41d 02m 33.8s) | C | 1 | 12.6 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.