Swift GRB230913.70: Global MASTER-Net observations report

MASTER-Tavrida robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, SAI Crimea astronomical station) was pointed to the Swift GRB230913.70 (trigger No 1191904,05h 35m 14.76s , +21d 45m 07.9s, R=0.05) errorbox 20899 sec after notice time and 21088 sec after trigger time at 2023-09-13 22:45:04 UT, with upper limit up to 16.1 mag. The observations began at zenith distance = 64 deg. The sun altitude is -40.0 deg. The galactic latitude b = -5 deg., longitude l = 185 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2269979 We obtain a following upper limits. Tmid-T0 | Site |Filt.| Expt. | Limit| Comment _________|_____________________|_____|_______|______|________ 21178 | MASTER-Tavrida | C | 180 | 16.1 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.