TITLE: GCN CIRCULAR NUMBER: 26896 SUBJECT: Swift GRB200127.61: Global MASTER-Net observations report DATE: 20/01/27 15:04:59 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, E. Gorbovskoy, V.Kornilov, N.Tyurina, P.Balanutsa, A.Kuznetsov, F.Balakin, V.Vladimirov, D. Vlasenko, I.Gorbunov, D.Zimnukhov, V.Senik, T.Pogrosheva, D.Kuvshinov, D. Cheryasov (Lomonosov Moscow State University, SAI, Physics Department), R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico Felix Aguilar OAFA), H.Levato (Instituto de Ciencias Astronomicas, de la Tierra y del Espacio ICATE), R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias), D. Buckley (South African Astronomical Observatory), O.A. Gres, N.M. Budnev, O.Ershova (Irkutsk State University, API), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), V. Yurkov, A. Gabovich, Yu. Sergienko (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 GRB200127.61 (trigger No 952791,19h 40m 48.96s , +44d 54m 36.0s, R=0.05) errorbox 2 sec after notice time and 99 sec after trigger time at 2020-01-27 14:46:10 UT, with upper limit up to 12.5 mag. The observations began at zenith distance = 85 deg. The sun altitude is -56.5 deg. MASTER-Kislovodsk robotic telescope located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the Swift GRB200127.61 errorbox 6 sec after notice time and 102 sec after trigger time at 2020-01-27 14:46:14 UT, with upper limit up to 16.1 mag. Observations started at twilight. The observations began at zenith distance = 64 deg. The sun altitude is -6.0 deg. The galactic latitude b = 11 deg., longitude l = 78 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1270540 We obtain a following upper limits. Tmid-T0 | Site |Filt.| Expt. | Limit| Comment _________|_____________________|_____|_______|______|________ 109 | MASTER-Amur | P/ | 20 | 12.5 | 113 | MASTER-Kislovodsk | P| | 20 | 14.3 | 146 | MASTER-Amur | P/ | 30 | 12.5 | 727 | MASTER-Kislovodsk | P| | 130 | 16.1 | The observation and reduction will continue. The message may be cited.