TITLE: GCN CIRCULAR NUMBER: 30963 SUBJECT: Fermi GRB 211024A: Global MASTER-Net observations report DATE: 21/10/24 02:30:28 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru> 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), 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-OAFA robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Argentina (OAFA observatory of San Juan National University) started inspect of the Fermi GRB 211024A ( Fermi GBM team, GCN 30962) errorbox 280 sec after notice time and 309 sec after trigger time at 2021-10-24 01:39:20 UT, with upper limit up to 19.1 mag. The observations began at zenith distance = 47 deg. The sun altitude is -32.7 deg. The galactic latitude b = -57 deg., longitude l = 97 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1763191 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 339 | 2021-10-24 01:39:20 | MASTER-OAFA | (00h 38m 42.05s , +11d 16m 19.3s) | C | 60 | 19.0 | 419 | 2021-10-24 01:40:40 | MASTER-OAFA | (00h 46m 53.72s , +11d 18m 21.4s) | C | 60 | 19.1 | 501 | 2021-10-24 01:42:02 | MASTER-OAFA | (00h 38m 55.48s , +13d 12m 22.8s) | C | 60 | 18.9 | 580 | 2021-10-24 01:43:21 | MASTER-OAFA | (00h 47m 13.18s , +13d 11m 29.3s) | C | 60 | 18.9 | 660 | 2021-10-24 01:44:41 | MASTER-OAFA | (00h 38m 29.82s , +09d 22m 30.1s) | C | 60 | 19.0 | 739 | 2021-10-24 01:46:00 | MASTER-OAFA | (00h 46m 33.62s , +09d 24m 18.1s) | C | 60 | 19.0 | 819 | 2021-10-24 01:47:20 | MASTER-OAFA | (00h 54m 36.41s , +13d 12m 38.5s) | C | 60 | 18.8 | 978 | 2021-10-24 01:49:59 | MASTER-OAFA | (00h 54m 12.45s , +11d 17m 40.6s) | C | 60 | 18.7 | 1139 | 2021-10-24 01:52:40 | MASTER-OAFA | (00h 53m 50.67s , +09d 24m 40.5s) | C | 60 | 18.6 | 1634 | 2021-10-24 02:00:55 | MASTER-OAFA | (01h 01m 52.87s , +09d 23m 31.2s) | C | 60 | 18.6 | 1714 | 2021-10-24 02:02:15 | MASTER-OAFA | (00h 38m 36.81s , +11d 18m 11.9s) | C | 60 | 18.8 | 1795 | 2021-10-24 02:03:36 | MASTER-OAFA | (00h 46m 51.74s , +11d 17m 19.2s) | C | 60 | 18.8 | 1874 | 2021-10-24 02:04:55 | MASTER-OAFA | (00h 38m 53.73s , +13d 10m 13.7s) | C | 60 | 18.6 | 1956 | 2021-10-24 02:06:17 | MASTER-OAFA | (00h 47m 13.27s , +13d 10m 47.5s) | C | 60 | 18.7 | 2036 | 2021-10-24 02:07:37 | MASTER-OAFA | (00h 38m 26.10s , +09d 23m 54.7s) | C | 60 | 18.8 | 2116 | 2021-10-24 02:08:57 | MASTER-OAFA | (00h 46m 32.07s , +09d 22m 41.4s) | C | 60 | 18.7 | 2196 | 2021-10-24 02:10:17 | MASTER-OAFA | (00h 54m 34.50s , +13d 12m 15.5s) | C | 60 | 18.6 | 2358 | 2021-10-24 02:12:59 | MASTER-OAFA | (00h 54m 06.34s , +11d 18m 29.1s) | C | 60 | 18.4 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.