LIGO/Virgo S230608as: Global MASTER-Net observations report

MASTER-Kislovodsk robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the LIGO/Virgo S230608as errorbox 4 sec after notice time and 53 sec after trigger time at 2023-06-08 20:51:40 UT, with upper limit up to 17.6 mag. The observations began at zenith distance = 85 deg. The sun altitude is -24.0 deg. The galactic latitude b = -1 deg., longitude l = 150 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/ligo_1.php?id=11968 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 59 | 2023-06-08 20:51:40 | MASTER-Kislovodsk | (04h 00m 18.64s , +51d 11m 35.3s) | C | 10 | 15.8 | 84 | 2023-06-08 20:51:40 | MASTER-Kislovodsk | (04h 00m 18.64s , +51d 11m 35.3s) | C | 60 | 16.9 | Coadd 314 | 2023-06-08 20:51:40 | MASTER-Kislovodsk | (04h 00m 18.64s , +51d 11m 35.7s) | C | 520 | 17.6 | Coadd 98 | 2023-06-08 20:52:14 | MASTER-Kislovodsk | (04h 00m 24.55s , +51d 10m 32.3s) | C | 20 | 16.1 | 146 | 2023-06-08 20:52:58 | MASTER-Kislovodsk | (04h 00m 19.41s , +51d 09m 28.1s) | C | 30 | 16.5 | 206 | 2023-06-08 20:53:52 | MASTER-Kislovodsk | (04h 00m 24.45s , +51d 09m 48.3s) | C | 40 | 16.5 | 261 | 2023-06-08 20:53:52 | MASTER-Kislovodsk | (04h 00m 24.46s , +51d 09m 47.9s) | C | 150 | 17.3 | Coadd 274 | 2023-06-08 20:54:56 | MASTER-Kislovodsk | (04h 00m 22.65s , +51d 10m 56.9s) | C | 50 | 16.6 | 353 | 2023-06-08 20:56:09 | MASTER-Kislovodsk | (04h 00m 22.41s , +51d 09m 37.0s) | C | 60 | 16.5 | 447 | 2023-06-08 20:57:33 | MASTER-Kislovodsk | (04h 00m 25.68s , +51d 11m 09.4s) | C | 80 | 15.5 | 562 | 2023-06-08 20:57:33 | MASTER-Kislovodsk | (04h 00m 25.68s , +51d 11m 09.8s) | C | 310 | 17.3 | Coadd 561 | 2023-06-08 20:59:17 | MASTER-Kislovodsk | (04h 00m 19.58s , +51d 10m 12.5s) | C | 100 | 16.5 | 700 | 2023-06-08 21:01:21 | MASTER-Kislovodsk | (04h 00m 18.72s , +51d 11m 13.5s) | C | 130 | 17.3 | 2639 | 2023-06-08 21:33:16 | MASTER-Kislovodsk | (04h 00m 33.02s , +51d 10m 45.1s) | C | 180 | 17.0 | 2819 | 2023-06-08 21:33:16 | MASTER-Kislovodsk | (04h 00m 33.03s , +51d 10m 44.7s) | C | 540 | 17.6 | Coadd 2844 | 2023-06-08 21:36:40 | MASTER-Kislovodsk | (04h 00m 26.26s , +51d 09m 39.2s) | C | 180 | 17.1 | 3048 | 2023-06-08 21:40:04 | MASTER-Kislovodsk | (04h 00m 33.94s , +51d 09m 56.9s) | C | 180 | 17.3 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.