LIGO/Virgo S230619x: Global MASTER-Net observations report

MASTER-OAFA robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Argentina (OAFA observatory of San Juan National University) started inspect of the LIGO/Virgo S230619x errorbox 139 sec after notice time and 299 sec after trigger time at 2023-06-19 05:43:59 UT, with upper limit up to 18.9 mag. The observations began at zenith distance = 52 deg. The sun altitude is -73.1 deg. The galactic latitude b = -44 deg., longitude l = 314 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/ligo_1.php?id=12144 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 329 | 2023-06-19 05:43:59 | MASTER-OAFA | (23h 08m 22.95s , -72d 18m 00.4s) | C | 60 | 18.5 | 426 | 2023-06-19 05:45:30 | MASTER-OAFA | (23h 08m 25.94s , -72d 16m 08.7s) | C | 70 | 18.5 | 537 | 2023-06-19 05:47:11 | MASTER-OAFA | (23h 08m 21.02s , -72d 17m 04.5s) | C | 90 | 18.7 | 673 | 2023-06-19 05:49:13 | MASTER-OAFA | (23h 08m 21.80s , -72d 16m 04.0s) | C | 120 | 18.9 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.