TITLE: GCN CIRCULAR NUMBER: 44602 SUBJECT: Fermi GRB 260513A: Global MASTER-Net observations report DATE: 26/05/14 00:16:36 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 260513A ( Fermi GBM team, GCN 44599) errorbox 9005 sec after notice time and 9068 sec after trigger time at 2026-05-13 23:55:26 UT, with upper limit up to 20.0 mag. The observations began at zenith distance = 56 deg. The sun altitude is -67.4 deg. The galactic latitude b = -46 deg., longitude l = 8 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=3312539 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 9098 | 2026-05-13 23:55:26 | MASTER-SAAO | (21h 18m 43.70s , -36d 30m 06.5s) | C | 60 | 18.6 | 9158 | 2026-05-13 23:55:26 | MASTER-SAAO | (21h 18m 43.70s , -36d 30m 06.5s) | C | 180 | 19.3 | 9098 | 2026-05-13 23:55:26 | MASTER-SAAO | (21h 21m 03.32s , -36d 45m 45.9s) | C | 60 | 18.9 | 9158 | 2026-05-13 23:55:26 | MASTER-SAAO | (21h 21m 03.33s , -36d 45m 45.9s) | C | 180 | 19.6 | 9191 | 2026-05-13 23:56:59 | MASTER-SAAO | (21h 18m 50.50s , -36d 31m 06.3s) | C | 60 | 18.6 | 9191 | 2026-05-13 23:56:59 | MASTER-SAAO | (21h 21m 10.07s , -36d 46m 45.8s) | C | 60 | 18.9 | 9285 | 2026-05-13 23:58:34 | MASTER-SAAO | (21h 18m 44.23s , -36d 32m 06.3s) | C | 60 | 18.7 | 9285 | 2026-05-13 23:58:34 | MASTER-SAAO | (21h 21m 03.77s , -36d 47m 45.7s) | C | 60 | 18.9 | 9408 | 2026-05-14 00:00:06 | MASTER-SAAO | (21h 18m 50.60s , -36d 31m 55.6s) | C | 120 | 19.1 | 9558 | 2026-05-14 00:00:06 | MASTER-SAAO | (21h 18m 50.60s , -36d 31m 55.5s) | C | 420 | 19.8 | 9408 | 2026-05-14 00:00:06 | MASTER-SAAO | (21h 21m 10.09s , -36d 47m 34.6s) | C | 120 | 19.4 | 9558 | 2026-05-14 00:00:06 | MASTER-SAAO | (21h 21m 10.09s , -36d 47m 34.6s) | C | 420 | 20.0 | 9562 | 2026-05-14 00:02:40 | MASTER-SAAO | (21h 18m 46.82s , -36d 30m 36.0s) | C | 120 | 19.0 | 9562 | 2026-05-14 00:02:40 | MASTER-SAAO | (21h 21m 06.23s , -36d 46m 14.7s) | C | 120 | 19.2 | 9715 | 2026-05-14 00:05:13 | MASTER-SAAO | (21h 18m 46.52s , -36d 31m 51.3s) | C | 120 | 19.2 | 9715 | 2026-05-14 00:05:13 | MASTER-SAAO | (21h 21m 05.97s , -36d 47m 30.1s) | C | 120 | 19.4 | 9868 | 2026-05-14 00:07:46 | MASTER-SAAO | (21h 18m 49.92s , -36d 30m 29.6s) | C | 120 | 19.3 | 9868 | 2026-05-14 00:07:46 | MASTER-SAAO | (21h 21m 09.35s , -36d 46m 08.2s) | C | 120 | 19.5 | 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/44602. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...