TITLE: GCN CIRCULAR NUMBER: 45492 SUBJECT: EP260901a: Global MASTER-Net observations report DATE: 26/09/01 21:45:38 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru> D.Buckley (SAAO), 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 (Lomonosov MSU) A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity) A.Sosnovskij (CrAO RAS) A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory) L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory) R.Rebolo (The Instituto de Astrofisica de Canarias) O.Gress, N.Budnev(ISU) M. Segura, F. Podesta, R.Podesta, E. Gonzalez (Observatorio Astronomico Felix Aguilar (OAFA) MASTER-SAAO robotic telescope [1] located in South Africa (South African Astronomical Observatory) was pointed to the EP260901a ( EP Team at NAOC/CAS <ep_ta@bao.ac.cn> et al., GCN 45487) errorbox 23673 sec after notice time and 53037 sec after trigger time at 2026-09-01 19:51:42 UT, with upper limit up to 17.8 mag. The observations began at zenith distance = 38 deg. The sun altitude is -45.1 deg. The galactic latitude b = 9 deg., longitude l = 6 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=3497756 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 53068 | 2026-09-01 19:51:42 | MASTER-SAAO | (17h 20m 52.36s , -19d 19m 12.5s) | C | 60 | 17.4 | 53162 | 2026-09-01 19:53:16 | MASTER-SAAO | (17h 20m 57.98s , -19d 20m 07.5s) | C | 60 | 17.6 | 53256 | 2026-09-01 19:54:51 | MASTER-SAAO | (17h 20m 52.19s , -19d 21m 03.2s) | C | 60 | 17.6 | 53350 | 2026-09-01 19:56:24 | MASTER-SAAO | (17h 20m 57.58s , -19d 20m 49.1s) | C | 60 | 17.7 | 53454 | 2026-09-01 19:58:08 | MASTER-SAAO | (17h 20m 54.81s , -19d 19m 14.3s) | C | 60 | 17.7 | 53973 | 2026-09-01 20:06:47 | MASTER-SAAO | (17h 20m 51.34s , -19d 19m 37.7s) | C | 60 | 17.8 | 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/45492. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...