TITLE: GCN CIRCULAR NUMBER: 45518 SUBJECT: EP Alert 260903.47: Global MASTER-Net observations report DATE: 26/09/04 18:36:35 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 (Lomonosov MSU) D.Buckley (SAAO), 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-Tavrida robotic telescope [1] located in Russia (Lomonosov MSU, SAI Crimea astronomical station) was pointed to the EP Alert 260903.47 (trigger No 1788434279,19h 28m 00.96s , -21d 29m 38.4s, R=0.0433333) errorbox 35381 sec after notice time and 1 days 24713 sec after trigger time at 2026-09-04 18:09:52 UT, with upper limit up to 18.0 mag. The observations began at zenith distance = 66 deg. The sun altitude is -19.8 deg. The galactic latitude b = -18 deg., longitude l = 18 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=3498862 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 111204 | 2026-09-04 18:09:52 | MASTER-Tavrida | (19h 27m 56.99s , -21d 32m 42.5s) | C | 180 | 17.5 | 111204 | 2026-09-04 18:09:53 | MASTER-Tavrida | (19h 27m 51.29s , -21d 33m 06.2s) | C | 180 | 18.0 | 111400 | 2026-09-04 18:13:09 | MASTER-Tavrida | (19h 27m 46.19s , -21d 33m 13.6s) | C | 180 | 18.0 | 111436 | 2026-09-04 18:13:45 | MASTER-Tavrida | (19h 27m 51.64s , -21d 32m 51.1s) | C | 180 | 17.7 | 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/45518. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...