TITLE: GCN CIRCULAR NUMBER: 43352 SUBJECT: Fermi GRB 260107A: Global MASTER-Net observations report DATE: 26/01/08 15:38:08 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-SAAO robotic telescope [1] located in South Africa (South African Astronomical Observatory) started inspect of the Fermi GRB 260107A ( Fermi GBM team, GCN 43350) errorbox 45 sec after notice time and 53 sec after trigger time at 2026-01-07 19:57:55 UT, with upper limit up to 16.7 mag. The observations began at zenith distance = 87 deg. The sun altitude is -22.6 deg. The galactic latitude b = -47 deg., longitude l = 70 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=3098086 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 59 | 2026-01-07 19:57:55 | MASTER-SAAO | (22h 46m 37.28s , +02d 30m 33.7s) | C | 10 | 16.1 | 93 | 2026-01-07 19:58:24 | MASTER-SAAO | (22h 46m 36.17s , +02d 30m 45.9s) | C | 20 | 16.4 | 131 | 2026-01-07 19:59:03 | MASTER-SAAO | (22h 46m 35.02s , +02d 30m 58.5s) | C | 20 | 16.3 | 196 | 2026-01-07 19:59:57 | MASTER-SAAO | (22h 44m 44.92s , +00d 59m 56.2s) | C | 40 | 16.7 | 260 | 2026-01-07 20:00:56 | MASTER-SAAO | (22h 44m 43.40s , +01d 00m 12.6s) | C | 50 | 16.3 | 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/43352. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...