TITLE: GCN CIRCULAR NUMBER: 24364 SUBJECT: Fermi GRB190501.79 Global MASTER-Net observations report DATE: 19/05/01 19:46:32 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-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 Fermi GRB190501.79 ( 10h 25m 09.60s , -22d 0m 00.00s, R=11.04) errorbox 865 sec after trigger time at 2019-05-01 19:18:07 UT, with upper limit up to 18.8 mag. The observations began at zenit distance = 70 deg. The sun altitude is -22.6 deg. MASTER-SAAO robotic telescope located in South Africa (South African Astronomical Observatory) started inspect of the Fermi GRB190501.79 errorbox 1784 sec after trigger time at 2019-05-01 19:33:26 UT, with upper limit up to 19.8 mag. The observations began at zenit distance = 18 deg. The sun altitude is -45.3 deg. The galactic latitude b = -60 deg., longitude l = 98 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1007469 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 895 | 2019-05-01 19:18:07 | MASTER-Tavrida | ( 10h 23m 42.45s , -21d 56m 17.41s) | C | 60 | 18.7 | 895 | 2019-05-01 19:18:07 | MASTER-Tavrida | ( 10h 16m 48.59s , -21d 51m 17.72s) | C | 60 | 18.4 | 1303 | 2019-05-01 19:24:55 | MASTER-Tavrida | ( 10h 23m 42.34s , -21d 56m 19.31s) | C | 60 | 18.6 | 1303 | 2019-05-01 19:24:55 | MASTER-Tavrida | ( 10h 16m 48.51s , -21d 51m 20.19s) | C | 60 | 18.3 | 1399 | 2019-05-01 19:26:31 | MASTER-Tavrida | ( 10h 25m 35.79s , -19d 50m 57.10s) | C | 60 | 18.6 | 1399 | 2019-05-01 19:26:31 | MASTER-Tavrida | ( 10h 32m 24.42s , -19d 55m 59.38s) | C | 60 | 18.8 | 1495 | 2019-05-01 19:28:07 | MASTER-Tavrida | ( 10h 32m 58.77s , -23d 56m 08.80s) | C | 60 | 17.6 | 1495 | 2019-05-01 19:28:07 | MASTER-Tavrida | ( 10h 26m 00.50s , -23d 50m 53.79s) | C | 60 | 18.3 | 1590 | 2019-05-01 19:29:43 | MASTER-Tavrida | ( 10h 34m 01.75s , -21d 51m 10.17s) | C | 60 | 18.5 | 1814 | 2019-05-01 19:33:26 | MASTER-SAAO | ( 10h 8m 36.06s , -23d 48m 41.68s) | C | 60 | 19.8 | 1912 | 2019-05-01 19:35:04 | MASTER-SAAO | ( 10h 18m 09.12s , -17d 47m 54.87s) | C | 60 | 19.5 | 2012 | 2019-05-01 19:36:44 | MASTER-SAAO | ( 10h 18m 35.75s , -25d 48m 02.84s) | C | 60 | 19.6 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.