TITLE: GCN CIRCULAR NUMBER: 44691 SUBJECT: Fermi GRB 260522A: Global MASTER-Net observations report DATE: 26/05/22 09:15:54 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru> V.Lipunov, E.Gorbovskoy, A.Kuznetsov, K.Zhirkov, I.Panchenko, N.Tiurina, P.Balanutsa, V.Topolev, D.Vlasenko, G.Antipov, A.Sankovich, Yu.Tselik, Ya.Kechin, V.Senik, A.Chasovnikov, K.Labsina, I. Gorbunov (Lomonosov MSU), O.Gress, N.Budnev (ISU), C.Francile, F. Podesta, R.Podesta, E. Gonzalez (Observatorio Astronomico Felix Aguilar (OAFA), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A.Sosnovskij (CrAO), A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity), D.Buckley (SAAO), R.Rebolo (The Instituto de Astrofisica de Canarias), L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory) MASTER-OAGH robotic telescope [1] located in Mexico (OAGH National Institute for Astrophysics, Optics and Electronics) started inspect of the Fermi GRB 260522A ( Fermi GBM team, GCN 44687) errorbox 20242 sec after notice time and 20291 sec after trigger time at 2026-05-22 07:53:20 UT, with upper limit up to 18.8 mag. The observations began at zenith distance = 81 deg. The sun altitude is -37.9 deg. The galactic latitude b = -40 deg., longitude l = 86 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=3330735 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 20321 | 2026-05-22 07:53:20 | MASTER-OAGH | (22h 29m 21.04s , +17d 30m 10.0s) | C | 60 | 17.6 | 20736 | 2026-05-22 08:00:14 | MASTER-OAGH | (22h 31m 10.56s , +15d 35m 11.4s) | C | 60 | 17.8 | 20961 | 2026-05-22 08:04:00 | MASTER-OAGH | (22h 44m 59.44s , +19d 24m 13.9s) | C | 60 | 17.6 | 21293 | 2026-05-22 08:09:31 | MASTER-OAGH | (22h 37m 34.70s , +18d 07m 52.6s) | C | 60 | 18.5 | 21293 | 2026-05-22 08:09:31 | MASTER-OAGH | (22h 45m 20.15s , +17d 30m 06.7s) | C | 60 | 17.7 | 21552 | 2026-05-22 08:13:50 | MASTER-OAGH | (22h 47m 01.86s , +15d 35m 01.0s) | C | 60 | 17.6 | 21552 | 2026-05-22 08:13:50 | MASTER-OAGH | (22h 39m 21.07s , +16d 12m 47.8s) | C | 60 | 18.5 | 21807 | 2026-05-22 08:18:05 | MASTER-OAGH | (22h 31m 54.37s , +12d 23m 27.9s) | C | 60 | 18.2 | 21807 | 2026-05-22 08:18:05 | MASTER-OAGH | (22h 39m 27.63s , +11d 45m 47.0s) | C | 60 | 17.9 | 21879 | 2026-05-22 08:19:17 | MASTER-OAGH | (22h 27m 00.97s , +14d 18m 45.6s) | C | 60 | 18.8 | 21879 | 2026-05-22 08:19:17 | MASTER-OAGH | (22h 34m 37.36s , +13d 41m 11.6s) | C | 60 | 18.3 | 21965 | 2026-05-22 08:20:43 | MASTER-OAGH | (22h 42m 42.24s , +14d 19m 33.9s) | C | 60 | 18.5 | 21965 | 2026-05-22 08:20:43 | MASTER-OAGH | (22h 50m 18.96s , +13d 41m 45.4s) | C | 60 | 17.5 | 22042 | 2026-05-22 08:22:00 | MASTER-OAGH | (22h 53m 22.36s , +20d 01m 39.3s) | C | 60 | 18.4 | 22042 | 2026-05-22 08:22:00 | MASTER-OAGH | (23h 01m 12.71s , +19d 23m 51.7s) | C | 60 | 17.6 | 22189 | 2026-05-22 08:24:27 | MASTER-OAGH | (22h 53m 34.68s , +18d 06m 41.9s) | C | 60 | 18.5 | 22189 | 2026-05-22 08:24:27 | MASTER-OAGH | (23h 01m 19.97s , +17d 28m 52.6s) | C | 60 | 17.6 | 22410 | 2026-05-22 08:28:08 | MASTER-OAGH | (22h 38m 08.15s , +10d 29m 27.1s) | C | 60 | 18.7 | 22410 | 2026-05-22 08:28:08 | MASTER-OAGH | (22h 45m 38.44s , +09d 51m 42.6s) | C | 60 | 18.1 | 22633 | 2026-05-22 08:31:52 | MASTER-OAGH | (22h 47m 29.08s , +12d 24m 15.1s) | C | 60 | 18.6 | 22634 | 2026-05-22 08:31:52 | MASTER-OAGH | (22h 55m 02.26s , +11d 46m 29.2s) | C | 60 | 17.6 | 22713 | 2026-05-22 08:33:12 | MASTER-OAGH | (22h 55m 14.36s , +16d 11m 27.2s) | C | 60 | 18.3 | 22713 | 2026-05-22 08:33:12 | MASTER-OAGH | (23h 02m 54.91s , +15d 33m 41.2s) | C | 60 | 17.8 | 22938 | 2026-05-22 08:36:56 | MASTER-OAGH | (23h 09m 34.33s , +20d 00m 02.3s) | C | 60 | 18.6 | 23357 | 2026-05-22 08:43:56 | MASTER-OAGH | (22h 58m 25.81s , +14d 18m 37.0s) | C | 60 | 18.5 | 23357 | 2026-05-22 08:43:56 | MASTER-OAGH | (23h 06m 02.72s , +13d 40m 58.6s) | C | 60 | 17.9 | 23430 | 2026-05-22 08:45:08 | MASTER-OAGH | (23h 01m 03.75s , +09d 52m 16.5s) | C | 60 | 17.9 | 23430 | 2026-05-22 08:45:08 | MASTER-OAGH | (22h 53m 33.23s , +10d 29m 56.5s) | C | 60 | 18.4 | 23607 | 2026-05-22 08:48:05 | MASTER-OAGH | (23h 03m 00.46s , +12d 23m 19.5s) | C | 60 | 18.2 | 23607 | 2026-05-22 08:48:05 | MASTER-OAGH | (23h 10m 33.91s , +11d 45m 40.8s) | C | 60 | 17.8 | 23679 | 2026-05-22 08:49:17 | MASTER-OAGH | (23h 11m 07.56s , +16d 12m 42.7s) | C | 60 | 18.2 | 23679 | 2026-05-22 08:49:17 | MASTER-OAGH | (23h 18m 48.36s , +15d 35m 03.0s) | C | 60 | 17.5 | 23760 | 2026-05-22 08:50:39 | MASTER-OAGH | (22h 45m 45.40s , +08d 34m 28.4s) | C | 60 | 18.5 | 23760 | 2026-05-22 08:50:39 | MASTER-OAGH | (22h 53m 13.26s , +07d 57m 00.4s) | C | 60 | 18.5 | 24000 | 2026-05-22 08:54:38 | MASTER-OAGH | (23h 14m 05.04s , +14d 17m 27.5s) | C | 60 | 18.1 | 24073 | 2026-05-22 08:55:51 | MASTER-OAGH | (23h 09m 34.28s , +18d 06m 37.0s) | C | 60 | 18.6 | 24073 | 2026-05-22 08:55:51 | MASTER-OAGH | (23h 17m 19.72s , +17d 29m 07.5s) | C | 60 | 18.1 | 24253 | 2026-05-22 08:58:51 | MASTER-OAGH | (23h 09m 06.45s , +10d 28m 56.4s) | C | 60 | 18.7 | 24253 | 2026-05-22 08:58:51 | MASTER-OAGH | (23h 16m 37.32s , +09d 51m 15.3s) | C | 60 | 18.4 | 24325 | 2026-05-22 09:00:04 | MASTER-OAGH | (23h 01m 10.70s , +08d 36m 20.3s) | C | 60 | 18.6 | 24325 | 2026-05-22 09:00:04 | MASTER-OAGH | (23h 08m 39.11s , +07d 58m 43.5s) | C | 60 | 18.2 | 24618 | 2026-05-22 09:04:56 | MASTER-OAGH | (23h 18m 37.97s , +12d 23m 55.7s) | C | 60 | 18.5 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. [1] - V.M. Lipunov, V.G. Kornilov, E.S. Gorbovskoy, N.A. Tiurina & A.S.Kuznetsov, 2023, Astronomical Robotic Networks and Operative Multichanel Astrophysics, Lomonosov MSU PRESS, 591pp. http : // www.pereplet.ru/lipunov/625.html View this GCN Circular online at https://gcn.nasa.gov/circulars/44691. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...