TITLE: GCN CIRCULAR NUMBER: 31216 SUBJECT: Swift GRB 211211A: Global MASTER-Net observations report DATE: 21/12/12 13:10:09 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, T.Pogrosheva, E.Minkina, A.Chasovnikov, V.Topolev, V.Grinshpun, D.Kuvshinov, D. Cheryasov (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), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A. Gabovich, V.Yurkov (Blagoveschensk Educational State University) MASTER-Amur robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Blagoveshchensk State Pedagogical University) was pointed to the Swift GRB 211211A ( A. D'Ai et al., GCN 31202) errorbox 29687 sec after notice time and 29621 sec after trigger time at 2021-12-11 21:25:00 UT, with upper limit up to 13.5 mag. The observations began at zenith distance = 39 deg. The sun altitude is -17.3 deg. MASTER-Kislovodsk robotic telescope located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the Swift GRB 211211A errorbox 35200 sec after notice time and 35135 sec after trigger time at 2021-12-11 22:56:53 UT, with upper limit up to 19.1 mag. The observations began at zenith distance = 80 deg. The sun altitude is -59.4 deg. MASTER-Tavrida robotic telescope located in Russia (Lomonosov MSU, SAI Crimea astronomical station) was pointed to the Swift GRB 211211A errorbox 37423 sec after notice time and 37358 sec after trigger time at 2021-12-11 23:33:56 UT, with upper limit up to 17.2 mag. The observations began at zenith distance = 79 deg. The sun altitude is -58.1 deg. MASTER-IAC robotic telescope located in Spain (IAC Teide Observatory) was pointed to the Swift GRB 211211A errorbox 52860 sec after notice time and 52795 sec after trigger time at 2021-12-12 03:51:13 UT, with upper limit up to 18.9 mag. The observations began at zenith distance = 76 deg. The sun altitude is -50.4 deg. The galactic latitude b = 72 deg., longitude l = 39 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1810696 We obtain a following upper limits. Tmid-T0 | Site |Filt.| Expt. | Limit| Comment _________|_____________________|_____|_______|______|________ 29712 | MASTER-Amur | C | 180 | 13.5 | 35165 | MASTER-Kislovodsk | C | 60 | 17.4 | 35165 | MASTER-Kislovodsk | C | 60 | 17.5 | 35706 | MASTER-Kislovodsk | C | 180 | 18.0 | 35706 | MASTER-Kislovodsk | C | 180 | 18.2 | 36851 | MASTER-Kislovodsk | C | 60 | 17.4 | 36851 | MASTER-Kislovodsk | C | 60 | 17.7 | 37448 | MASTER-Tavrida | C | 180 | 17.1 | 37472 | MASTER-Kislovodsk | C | 180 | 18.3 | 37472 | MASTER-Kislovodsk | C | 180 | 18.6 | 38013 | MASTER-Kislovodsk | C | 60 | 17.5 | 38013 | MASTER-Kislovodsk | C | 60 | 18.0 | 38452 | MASTER-Tavrida | C | 60 | 17.0 | 39166 | MASTER-Tavrida | C | 60 | 17.2 | 39404 | MASTER-Tavrida | C | 60 | 17.1 | 40330 | MASTER-Tavrida | C | 60 | 15.6 | 40488 | MASTER-Tavrida | C | 60 | 15.1 | 40697 | MASTER-Kislovodsk | C | 180 | 18.3 | 40697 | MASTER-Kislovodsk | C | 180 | 18.4 | 41906 | MASTER-Tavrida | C | 60 | 12.8 | 41960 | MASTER-Kislovodsk | C | 60 | 18.0 | 42458 | MASTER-Tavrida | C | 60 | 12.2 | 42921 | MASTER-Kislovodsk | C | 60 | 18.3 | 43375 | MASTER-Tavrida | C | 180 | 13.2 | 43594 | MASTER-Tavrida | C | 60 | 12.0 | 43883 | MASTER-Kislovodsk | C | 60 | 18.3 | 48892 | MASTER-Kislovodsk | C | 180 | 18.9 | 48892 | MASTER-Kislovodsk | C | 180 | 19.1 | 49751 | MASTER-Tavrida | C | 180 | 14.4 | 49972 | MASTER-Tavrida | C | 60 | 13.9 | 50256 | MASTER-Kislovodsk | C | 180 | 18.5 | 50256 | MASTER-Kislovodsk | C | 180 | 18.5 | 50288 | MASTER-Tavrida | C | 60 | 13.2 | 51619 | MASTER-Kislovodsk | C | 180 | 16.8 | 51619 | MASTER-Kislovodsk | C | 180 | 14.5 | 52825 | MASTER-IAC | C | 60 | 16.3 | 52905 | MASTER-IAC | C | 60 | 14.0 | 52985 | MASTER-IAC | C | 60 | 17.3 | 54066 | MASTER-Tavrida | C | 60 | 15.2 | 54626 | MASTER-IAC | C | 60 | 17.4 | 54706 | MASTER-IAC | C | 60 | 17.4 | 54786 | MASTER-IAC | C | 60 | 17.6 | 55666 | MASTER-IAC | C | 60 | 17.5 | 55746 | MASTER-IAC | C | 60 | 17.9 | 56120 | MASTER-IAC | C | 60 | 17.9 | 59363 | MASTER-IAC | C | 180 | 18.7 | 59363 | MASTER-IAC | C | 180 | 18.7 | 60352 | MASTER-IAC | C | 180 | 18.9 | 60352 | MASTER-IAC | C | 180 | 18.7 | 61693 | MASTER-IAC | C | 180 | 18.9 | 61693 | MASTER-IAC | C | 180 | 18.7 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.