TITLE: GCN CIRCULAR NUMBER: 23991 SUBJECT: SWIFT GRB190323.85 Global MASTER-Net observations report DATE: 19/03/23 21:41:30 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, E. Gorbovskoy, V.Kornilov, D.Kuvshinov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.V.Chazov, D. Vlasenko Lomonosov Moscow State University, Sternberg Astronomical Institute, Moscow State University A. Tlatov, V.Senik, A.V. Parhomenko, D. Dormidontov Kislovodsk Solar Station of the Pulkovo Observatory K. Ivanov, O. Gres, N.M. Budnev, S. Yazev, O. Chuvalaev, V. Poleshchuk Irkutsk State University V. Yurkov, A. Gabovich, Yu. Sergienko Blagoveschensk Educational State University, Blagoveschensk R. Podesta, Carlos Lopez and F. Podesta Observatorio Astronomico Felix Aguilar (OAFA) Hugo Levato and Carlos Saffe Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE) R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres The Instituto de Astrofisica de Canarias D. Buckley, S. Potter, A. Kniazev, M. Kotze South African Astronomical Observatory MASTER-IAC robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Spain (IAC Teide Observatory) was pointed to the SWIFT GRB190323.85 ( 2h 40m 36.72s , +61d 14m 45.60s, R=0.05) 41 sec after trigger time at 2019-03-23 20:31:28 UT, with upper limit up to 18.5 mag. The observations began at zenit distance = 57 deg. The sun altitude is -17.5 deg. MASTER-Tunka robotic telescope located in Russia (Applied Physics Institute, Irkutsk State University) was pointed to the SWIFT GRB190323.85 68 sec after trigger time at 2019-03-23 20:31:55 UT, with upper limit up to 16.7 mag. The observations began at zenit distance = 67 deg. The sun altitude is -23.2 deg. The galactic latitude b = -60 deg., longitude l = 98 deg. We obtain a following upper limits. Tmid-T0 | Site |Filt.| Expt. | Limit| Comment _________|_____________________|_____|_______|______|________ 46 | MASTER-IAC | P- | 10 | 16.4 | 46 | MASTER-IAC | P| | 10 | 16.8 | 74 | MASTER-Tunka | C | 10 | 12.3 | 101 | MASTER-IAC | P- | 20 | 17.0 | 101 | MASTER-IAC | P| | 20 | 17.3 | 138 | MASTER-IAC | P- | 20 | 17.0 | 138 | MASTER-IAC | P| | 20 | 17.3 | 180 | MASTER-IAC | P- | 30 | 17.2 | 180 | MASTER-IAC | P| | 30 | 17.6 | 233 | MASTER-IAC | P- | 40 | 17.4 | 233 | MASTER-IAC | P| | 40 | 17.9 | 293 | MASTER-IAC | P- | 50 | 17.7 | 293 | MASTER-IAC | P| | 50 | 18.0 | 368 | MASTER-IAC | P| | 70 | 18.2 | 368 | MASTER-IAC | P- | 70 | 17.8 | 411 | MASTER-Tunka | P| | 70 | 16.4 | 458 | MASTER-IAC | P- | 80 | 18.0 | 458 | MASTER-IAC | P| | 80 | 18.4 | 563 | MASTER-IAC | P- | 100 | 18.0 | 563 | MASTER-IAC | P| | 100 | 18.5 | 567 | MASTER-Tunka | P| | 100 | 16.5 | 1239 | MASTER-Tunka | P| | 180 | 15.5 | 1489 | MASTER-Tunka | P| | 180 | 15.1 | 2272 | MASTER-Tunka | P| | 180 | 16.4 | 2524 | MASTER-Tunka | P| | 180 | 16.7 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.