TITLE: GCN CIRCULAR NUMBER: 34848 SUBJECT: Fermi GRB 231019A: Global MASTER-Net observations report DATE: 23/10/20 00:00:57 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru> V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik, D. Vlasenko, G.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij (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. Gress, N.M. Budnev, O.Ershova (Irkutsk State University, API), L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), V. Yurkov, A. Gabovich (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) started inspect of the Fermi GRB 231019A ( Fermi GBM team, GCN 34842) errorbox 816 sec after notice time and 850 sec after trigger time at 2023-10-19 17:24:09 UT, with upper limit up to 17.5 mag. The observations began at zenith distance = 46 deg. The sun altitude is -42.0 deg. The galactic latitude b = -12 deg., longitude l = 103 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2288694 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 881 | 2023-10-19 17:24:09 | MASTER-Amur | (22h 54m 16.71s , +46d 46m 10.5s) | C | 60 | 17.4 | 961 | 2023-10-19 17:25:28 | MASTER-Amur | (23h 05m 59.53s , +46d 44m 56.9s) | C | 60 | 17.5 | 1040 | 2023-10-19 17:26:48 | MASTER-Amur | (22h 59m 27.09s , +48d 37m 55.9s) | C | 60 | 17.5 | 1120 | 2023-10-19 17:28:08 | MASTER-Amur | (23h 11m 28.93s , +48d 39m 20.4s) | C | 60 | 17.4 | 1200 | 2023-10-19 17:29:28 | MASTER-Amur | (22h 36m 34.03s , +48d 40m 14.4s) | C | 60 | 17.1 | 1279 | 2023-10-19 17:30:47 | MASTER-Amur | (22h 48m 32.17s , +48d 39m 03.7s) | C | 60 | 17.4 | 1370 | 2023-10-19 17:32:18 | MASTER-Amur | (22h 42m 41.86s , +50d 33m 03.9s) | C | 60 | 17.2 | 1450 | 2023-10-19 17:33:38 | MASTER-Amur | (22h 55m 09.57s , +50d 31m 51.8s) | C | 60 | 17.4 | 1530 | 2023-10-19 17:34:58 | MASTER-Amur | (22h 54m 23.63s , +46d 44m 22.5s) | C | 60 | 17.1 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. View this GCN Circular online at https://gcn.nasa.gov/circulars/34848. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...