TITLE: GCN CIRCULAR NUMBER: 33160 SUBJECT: Fermi GRB 230112A: Global MASTER-Net observations report DATE: 23/01/12 12:15:29 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko, G.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin (Lomonosov Moscow State University, SAI, Physics Department), R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico Felix Aguilar OAFA), R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias), D. Buckley (South African Astronomical Observatory), O.A. Gres, N.M. Budnev (Irkutsk State University, API), L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A. Gabovich, V.Yurkov (Blagoveschensk Educational State University) 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 GRB 230112A ( Fermi GBM team, GCN 33158) errorbox 8076 sec after notice time and 8115 sec after trigger time at 2023-01-12 10:27:47 UT, with upper limit up to 19.1 mag. Observations started at twilight. The observations began at zenith distance = 71 deg. The sun altitude is -9.7 deg. The galactic latitude b = -37 deg., longitude l = 196 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2191573 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 8145 | 2023-01-12 10:27:47 | MASTER-Tunka | (05h 08m 15.47s , +04d 53m 17.7s) | C | 60 | 15.8 | 8326 | 2023-01-12 10:30:48 | MASTER-Tunka | (05h 07m 28.92s , +02d 59m 26.0s) | C | 60 | 17.2 | 8418 | 2023-01-12 10:32:20 | MASTER-Tunka | (05h 07m 09.16s , +01d 07m 12.6s) | C | 60 | 17.0 | 8599 | 2023-01-12 10:35:21 | MASTER-Tunka | (04h 51m 50.90s , +01d 07m 37.3s) | C | 60 | 17.5 | 8691 | 2023-01-12 10:36:53 | MASTER-Tunka | (04h 52m 19.46s , +03d 00m 43.7s) | C | 60 | 17.7 | 8782 | 2023-01-12 10:38:24 | MASTER-Tunka | (05h 06m 58.53s , -00d 48m 29.0s) | C | 60 | 17.5 | 9096 | 2023-01-12 10:43:38 | MASTER-Tunka | (05h 00m 31.34s , +06d 43m 49.0s) | C | 60 | 18.1 | 9280 | 2023-01-12 10:46:42 | MASTER-Tunka | (05h 08m 16.67s , +04d 55m 35.8s) | C | 60 | 18.2 | 9280 | 2023-01-12 10:46:42 | MASTER-Tunka | (04h 59m 34.83s , +04d 49m 50.9s) | C | 60 | 18.2 | 9463 | 2023-01-12 10:49:45 | MASTER-Tunka | (05h 07m 26.75s , +03d 02m 08.1s) | C | 60 | 17.9 | 9464 | 2023-01-12 10:49:46 | MASTER-Tunka | (04h 58m 46.81s , +02d 56m 25.9s) | C | 60 | 18.0 | 9556 | 2023-01-12 10:51:18 | MASTER-Tunka | (05h 07m 08.33s , +01d 07m 11.3s) | C | 60 | 17.8 | 9556 | 2023-01-12 10:51:18 | MASTER-Tunka | (04h 58m 29.90s , +01d 01m 30.8s) | C | 60 | 18.1 | 9741 | 2023-01-12 10:54:23 | MASTER-Tunka | (04h 51m 57.86s , +01d 06m 42.8s) | C | 60 | 18.4 | 9741 | 2023-01-12 10:54:23 | MASTER-Tunka | (04h 43m 17.97s , +01d 00m 58.8s) | C | 60 | 18.7 | 9832 | 2023-01-12 10:55:54 | MASTER-Tunka | (04h 52m 16.99s , +03d 02m 23.3s) | C | 60 | 18.6 | 9832 | 2023-01-12 10:55:54 | MASTER-Tunka | (04h 43m 35.15s , +02d 56m 37.7s) | C | 60 | 18.7 | 9922 | 2023-01-12 10:57:24 | MASTER-Tunka | (05h 07m 02.90s , -00d 47m 18.8s) | C | 60 | 18.4 | 9922 | 2023-01-12 10:57:24 | MASTER-Tunka | (04h 58m 25.31s , -00d 52m 58.4s) | C | 60 | 18.3 | 10239 | 2023-01-12 11:02:41 | MASTER-Tunka | (05h 00m 21.63s , +06d 43m 53.7s) | C | 60 | 18.7 | 10419 | 2023-01-12 11:05:41 | MASTER-Tunka | (05h 08m 17.85s , +04d 55m 49.1s) | C | 60 | 18.7 | 10419 | 2023-01-12 11:05:41 | MASTER-Tunka | (04h 59m 30.84s , +04d 50m 02.5s) | C | 60 | 18.5 | 10600 | 2023-01-12 11:08:42 | MASTER-Tunka | (05h 07m 33.92s , +03d 01m 23.7s) | C | 60 | 18.6 | 10601 | 2023-01-12 11:08:43 | MASTER-Tunka | (04h 58m 49.72s , +02d 55m 37.5s) | C | 60 | 18.5 | 10691 | 2023-01-12 11:10:13 | MASTER-Tunka | (05h 07m 06.67s , +01d 08m 44.0s) | C | 60 | 18.5 | 10691 | 2023-01-12 11:10:13 | MASTER-Tunka | (04h 58m 24.81s , +01d 02m 59.1s) | C | 60 | 18.5 | 10872 | 2023-01-12 11:13:14 | MASTER-Tunka | (04h 51m 58.31s , +01d 09m 02.7s) | C | 60 | 19.0 | 10873 | 2023-01-12 11:13:15 | MASTER-Tunka | (04h 43m 15.32s , +01d 03m 15.8s) | C | 60 | 19.1 | 10965 | 2023-01-12 11:14:47 | MASTER-Tunka | (04h 52m 14.16s , +03d 02m 15.7s) | C | 60 | 18.9 | 10965 | 2023-01-12 11:14:47 | MASTER-Tunka | (04h 43m 28.99s , +02d 56m 27.4s) | C | 60 | 18.7 | 11055 | 2023-01-12 11:16:17 | MASTER-Tunka | (05h 07m 00.75s , -00d 44m 50.0s) | C | 60 | 18.3 | 11056 | 2023-01-12 11:16:18 | MASTER-Tunka | (04h 58m 20.69s , -00d 50m 32.9s) | C | 60 | 18.3 | 11239 | 2023-01-12 11:19:21 | MASTER-Tunka | (05h 13m 34.42s , -00d 52m 29.3s) | C | 60 | 18.2 | 11420 | 2023-01-12 11:22:22 | MASTER-Tunka | (05h 13m 38.25s , +01d 03m 33.5s) | C | 60 | 18.4 | 11604 | 2023-01-12 11:25:26 | MASTER-Tunka | (04h 45m 10.84s , +06d 45m 37.8s) | C | 60 | 18.8 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.