TITLE: GCN CIRCULAR NUMBER: 43338 SUBJECT: Fermi GRB 260105B: Global MASTER-Net observations report DATE: 26/01/06 03:15:41 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-Kislovodsk robotic telescope [1] located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the Fermi GRB 260105B ( Fermi GBM team, GCN 43336) errorbox 11975 sec after notice time and 12000 sec after trigger time at 2026-01-06 02:41:37 UT, with upper limit up to 15.8 mag. The observations began at zenith distance = 76 deg. The sun altitude is -21.3 deg. The galactic latitude b = 21 deg., longitude l = 24 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=3096822 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 12031 | 2026-01-06 02:41:37 | MASTER-Kislovodsk | (17h 22m 13.00s , +01d 20m 58.9s) | C | 60 | 15.1 | 12031 | 2026-01-06 02:41:37 | MASTER-Kislovodsk | (17h 26m 08.53s , +00d 57m 53.4s) | C | 60 | 15.2 | 12121 | 2026-01-06 02:43:08 | MASTER-Kislovodsk | (17h 10m 08.21s , +01d 21m 09.6s) | C | 60 | 14.9 | 12128 | 2026-01-06 02:43:14 | MASTER-Kislovodsk | (17h 14m 04.52s , +00d 58m 08.3s) | C | 60 | 15.3 | 12226 | 2026-01-06 02:44:52 | MASTER-Kislovodsk | (17h 11m 25.82s , +03d 16m 06.5s) | C | 60 | 15.1 | 12226 | 2026-01-06 02:44:52 | MASTER-Kislovodsk | (17h 15m 22.74s , +02d 53m 06.6s) | C | 60 | 15.5 | 12321 | 2026-01-06 02:46:27 | MASTER-Kislovodsk | (17h 23m 33.99s , +03d 14m 28.1s) | C | 60 | 14.8 | 12322 | 2026-01-06 02:46:28 | MASTER-Kislovodsk | (17h 27m 29.97s , +02d 51m 24.2s) | C | 60 | 15.0 | 12414 | 2026-01-06 02:48:00 | MASTER-Kislovodsk | (17h 13m 55.29s , +05d 08m 02.6s) | C | 60 | 15.4 | 12414 | 2026-01-06 02:48:00 | MASTER-Kislovodsk | (17h 17m 53.06s , +04d 45m 03.0s) | C | 60 | 15.5 | 12510 | 2026-01-06 02:49:36 | MASTER-Kislovodsk | (17h 10m 02.76s , -00d 33m 18.0s) | C | 60 | 14.2 | 12510 | 2026-01-06 02:49:36 | MASTER-Kislovodsk | (17h 13m 58.54s , -00d 56m 23.5s) | C | 60 | 15.1 | 12604 | 2026-01-06 02:51:10 | MASTER-Kislovodsk | (17h 21m 59.11s , -00d 32m 11.6s) | C | 60 | 15.0 | 12605 | 2026-01-06 02:51:11 | MASTER-Kislovodsk | (17h 25m 53.95s , -00d 55m 21.3s) | C | 60 | 15.3 | 12703 | 2026-01-06 02:52:49 | MASTER-Kislovodsk | (17h 26m 04.82s , +05d 09m 14.6s) | C | 60 | 15.8 | 12812 | 2026-01-06 02:54:38 | MASTER-Kislovodsk | (17h 03m 25.00s , +02d 54m 15.4s) | C | 60 | 13.8 | 13208 | 2026-01-06 03:01:14 | MASTER-Kislovodsk | (17h 34m 09.17s , +01d 21m 41.1s) | C | 60 | 13.3 | 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/43338. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...