TITLE: GCN CIRCULAR NUMBER: 24868 SUBJECT: Fermi trigger No 582759998 Global MASTER-Net observations report DATE: 19/06/20 22:31:13 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 (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-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) started inspect of the Fermi GRB190620.91 (trigger No 582759998, 11h 19m 55.99s , -51d 49m 59.88s, R=26.75) errorbox 176 sec after trigger time at 2019-06-20 21:49:29 UT, with upper limit up to 19.0 mag. The observations began at zenit distance = 91 deg. The sun altitude is -20.3 deg. MASTER-SAAO robotic telescope located in South Africa (South African Astronomical Observatory) started inspect of the Fermi GRB190620.91 errorbox 212 sec after trigger time at 2019-06-20 21:50:05 UT, with upper limit up to 18.7 mag. The observations began at zenit distance = 63 deg. The sun altitude is -76.0 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=1055735 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 266 | 2019-06-20 21:49:29 | MASTER-IAC | ( 12h 48m 03.85s , -41d 12m 42.00s) | C | 180 | 19.0 | 266 | 2019-06-20 21:49:29 | MASTER-IAC | ( 12h 47m 12.45s , -41d 8m 48.75s) | C | 180 | 18.8 | 303 | 2019-06-20 21:50:05 | MASTER-SAAO | ( 13h 6m 04.21s , -51d 51m 49.78s) | C | 180 | 18.5 | 521 | 2019-06-20 21:53:44 | MASTER-SAAO | ( 13h 50m 44.15s , -47d 50m 52.81s) | C | 180 | 18.3 | 740 | 2019-06-20 21:57:23 | MASTER-SAAO | ( 13h 20m 15.16s , -45d 51m 47.03s) | C | 180 | 18.0 | 956 | 2019-06-20 22:00:58 | MASTER-SAAO | ( 13h 31m 46.24s , -45d 51m 39.90s) | C | 180 | 18.4 | 1174 | 2019-06-20 22:04:37 | MASTER-SAAO | ( 13h 50m 45.46s , -47d 51m 07.59s) | C | 180 | 18.5 | 1392 | 2019-06-20 22:08:14 | MASTER-SAAO | ( 14h 2m 40.25s , -47d 51m 05.70s) | C | 180 | 18.7 | 1825 | 2019-06-20 22:15:28 | MASTER-SAAO | ( 13h 31m 46.09s , -45d 52m 05.99s) | C | 180 | 18.3 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.