TITLE: GCN CIRCULAR NUMBER: 43548 SUBJECT: Fermi GRB 260127A: Global MASTER-Net observations report DATE: 26/01/28 23:15:22 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 260127A ( Fermi GBM team, GCN 43528) errorbox 1 days 15723 sec after notice time and 1 days 15745 sec after trigger time at 2026-01-28 22:13:32 UT, with upper limit up to 16.8 mag. The observations began at zenith distance = 80 deg. The sun altitude is -63.0 deg. The galactic latitude b = 45 deg., longitude l = 357 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=3117030 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 102175 | 2026-01-28 22:13:32 | MASTER-Kislovodsk | (14h 51m 08.24s , +02d 48m 33.2s) | C | 60 | 16.6 | 102578 | 2026-01-28 22:20:15 | MASTER-Kislovodsk | (15h 05m 19.35s , +04d 43m 03.8s) | C | 60 | 16.6 | 102789 | 2026-01-28 22:23:46 | MASTER-Kislovodsk | (15h 03m 14.11s , +02d 50m 18.9s) | C | 60 | 16.5 | 102901 | 2026-01-28 22:25:38 | MASTER-Kislovodsk | (14h 49m 55.15s , -00d 58m 21.9s) | C | 60 | 16.8 | 103234 | 2026-01-28 22:31:11 | MASTER-Kislovodsk | (15h 02m 06.17s , +00d 55m 55.7s) | C | 60 | 16.8 | 103454 | 2026-01-28 22:34:51 | MASTER-Kislovodsk | (14h 50m 37.84s , -02d 52m 07.1s) | C | 60 | 16.5 | 103569 | 2026-01-28 22:36:46 | MASTER-Kislovodsk | (15h 15m 11.23s , +02d 50m 27.3s) | C | 60 | 16.5 | 103928 | 2026-01-28 22:42:46 | MASTER-Kislovodsk | (15h 13m 59.01s , +00d 56m 55.7s) | C | 60 | 16.6 | 104040 | 2026-01-28 22:44:38 | MASTER-Kislovodsk | (14h 52m 27.85s , -04d 45m 35.0s) | C | 60 | 16.6 | 104156 | 2026-01-28 22:46:33 | MASTER-Kislovodsk | (15h 02m 42.73s , -02d 51m 50.3s) | C | 60 | 16.6 | 104268 | 2026-01-28 22:48:25 | MASTER-Kislovodsk | (15h 27m 17.10s , +02d 49m 26.6s) | C | 60 | 16.5 | 104390 | 2026-01-28 22:50:27 | MASTER-Kislovodsk | (15h 13m 49.40s , -00d 57m 33.9s) | C | 60 | 16.6 | 104620 | 2026-01-28 22:54:17 | MASTER-Kislovodsk | (15h 26m 00.01s , +00d 54m 54.2s) | C | 60 | 16.5 | 104726 | 2026-01-28 22:56:03 | MASTER-Kislovodsk | (15h 04m 25.84s , -04d 43m 38.4s) | C | 60 | 16.7 | 104959 | 2026-01-28 22:59:56 | MASTER-Kislovodsk | (14h 55m 16.13s , -06d 36m 58.7s) | C | 60 | 16.7 | 105183 | 2026-01-28 23:03:40 | MASTER-Kislovodsk | (15h 25m 53.63s , -00d 56m 48.2s) | C | 60 | 16.7 | 105413 | 2026-01-28 23:07:30 | MASTER-Kislovodsk | (15h 07m 22.73s , -06d 39m 00.3s) | C | 60 | 16.6 | 105526 | 2026-01-28 23:09:23 | MASTER-Kislovodsk | (15h 16m 34.84s , -04d 44m 35.6s) | C | 60 | 16.8 | 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/43548. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...