TITLE: GCN CIRCULAR NUMBER: 44525 SUBJECT: EP260509a: Global MASTER-Net observations report DATE: 26/05/10 21:36:20 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) was pointed to the EP260509a ( EP Team et al., GCN 44517) errorbox 24957 sec after notice time and 1 days 27906 sec after trigger time at 2026-05-10 21:29:08 UT, with upper limit up to 17.9 mag. The observations began at zenith distance = 61 deg. The sun altitude is -29.1 deg. The galactic latitude b = 25 deg., longitude l = 353 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=3305450 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 114336 | 2026-05-10 21:29:08 | MASTER-Kislovodsk | (15h 55m 47.13s , -18d 04m 15.2s) | C | 60 | 12.6 | 114336 | 2026-05-10 21:29:08 | MASTER-Kislovodsk | (15h 55m 58.90s , -18d 27m 08.8s) | C | 60 | 17.8 | 114426 | 2026-05-10 21:30:38 | MASTER-Kislovodsk | (15h 55m 42.18s , -18d 05m 11.2s) | C | 60 | 12.1 | 114426 | 2026-05-10 21:30:38 | MASTER-Kislovodsk | (15h 55m 53.95s , -18d 28m 02.6s) | C | 60 | 17.9 | 114514 | 2026-05-10 21:32:06 | MASTER-Kislovodsk | (15h 55m 55.18s , -18d 27m 07.8s) | C | 60 | 17.9 | 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/44525. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...