MAXI GRB210102.38: 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) started inspect of the MAXI GRB210102.38 (trigger No 216347865,23h 33m 17.52s , -21d 05m 09.6s, R=1) errorbox 20657 sec after notice time and 22218 sec after trigger time at 2021-01-02 15:14:28 UT, with upper limit up to 18.6 mag. Observations started at twilight. The observations began at zenith distance = 66 deg. The sun altitude is -10.2 deg. The galactic latitude b = -72 deg., longitude l = 49 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1517221 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 22308 | 2021-01-02 15:14:28 | MASTER-Tavrida | (23h 38m 28.04s , -21d 16m 44.6s) | C | 180 | 16.5 | 22447 | 2021-01-02 15:17:47 | MASTER-Tavrida | (23h 40m 11.97s , -22d 12m 44.8s) | C | 60 | 16.8 | 22447 | 2021-01-02 15:17:47 | MASTER-Tavrida | (23h 33m 48.28s , -22d 08m 48.5s) | C | 60 | 17.1 | 23188 | 2021-01-02 15:29:07 | MASTER-Tavrida | (23h 38m 29.61s , -21d 16m 08.3s) | C | 180 | 18.0 | 23188 | 2021-01-02 15:29:07 | MASTER-Tavrida | (23h 32m 05.67s , -21d 12m 28.7s) | C | 180 | 17.8 | 23327 | 2021-01-02 15:32:27 | MASTER-Tavrida | (23h 38m 17.21s , -20d 11m 56.3s) | C | 60 | 17.9 | 23327 | 2021-01-02 15:32:27 | MASTER-Tavrida | (23h 31m 55.64s , -20d 08m 18.0s) | C | 60 | 18.3 | 23407 | 2021-01-02 15:33:46 | MASTER-Tavrida | (23h 40m 12.49s , -22d 11m 02.2s) | C | 60 | 18.0 | 23407 | 2021-01-02 15:33:46 | MASTER-Tavrida | (23h 33m 45.80s , -22d 07m 25.1s) | C | 60 | 18.4 | 23546 | 2021-01-02 15:35:05 | MASTER-Tavrida | (23h 38m 28.70s , -21d 17m 17.2s) | C | 180 | 18.6 | 23546 | 2021-01-02 15:35:05 | MASTER-Tavrida | (23h 32m 04.24s , -21d 13m 40.4s) | C | 180 | 18.6 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.