TITLE: GCN CIRCULAR NUMBER: 40393 SUBJECT: EP250508a: Global MASTER-Net observations report DATE: 25/05/08 07:27:33 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-OAFA robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Argentina (OAFA observatory of San Juan National University) was pointed to the EP250508a ( EP Team et al., GCN 40390) errorbox 2079 sec after notice time and 4289 sec after trigger time at 2025-05-08 07:15:16 UT, with upper limit up to 17.4 mag. The observations began at zenith distance = 78 deg. The sun altitude is -50.3 deg. The galactic latitude b = 41 deg., longitude l = 286 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2865106 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 4319 | 2025-05-08 07:15:16 | MASTER-OAFA | (11h 53m 09.22s , -19d 33m 11.7s) | C | 60 | 17.4 | 4394 | 2025-05-08 07:16:31 | MASTER-OAFA | (11h 53m 07.05s , -19d 31m 34.0s) | C | 60 | 17.4 | 4470 | 2025-05-08 07:17:47 | MASTER-OAFA | (11h 53m 07.04s , -19d 33m 09.7s) | C | 60 | 17.3 | 4546 | 2025-05-08 07:19:02 | MASTER-OAFA | (11h 53m 09.55s , -19d 31m 44.2s) | C | 60 | 17.2 | 4623 | 2025-05-08 07:20:19 | MASTER-OAFA | (11h 53m 03.85s , -19d 32m 19.3s) | C | 60 | 17.1 | 4698 | 2025-05-08 07:21:35 | MASTER-OAFA | (11h 53m 04.97s , -19d 31m 19.3s) | C | 60 | 17.1 | 4774 | 2025-05-08 07:22:50 | MASTER-OAFA | (11h 53m 10.78s , -19d 32m 20.0s) | C | 60 | 17.1 | 4851 | 2025-05-08 07:24:07 | MASTER-OAFA | (11h 53m 03.30s , -19d 33m 20.6s) | C | 60 | 17.0 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. View this GCN Circular online at https://gcn.nasa.gov/circulars/40393. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...