TITLE: GCN CIRCULAR NUMBER: 40446 SUBJECT: EP250512a: Global MASTER-Net observations report DATE: 25/05/12 20:45:41 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 (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) was pointed to the EP250512a ( EP Team et al., GCN 40437) errorbox 28318 sec after notice time and 31541 sec after trigger time at 2025-05-12 20:07:49 UT, with upper limit up to 17.7 mag. The observations began at zenith distance = 30 deg. The sun altitude is -54.2 deg. The galactic latitude b = 46 deg., longitude l = 337 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2868623 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 31571 | 2025-05-12 20:07:49 | MASTER-SAAO | (14h 19m 12.13s , -10d 13m 30.1s) | C | 60 | 17.2 | 31631 | 2025-05-12 20:07:49 | MASTER-SAAO | (14h 19m 12.13s , -10d 13m 30.1s) | C | 180 | 17.7 | Coadd 31650 | 2025-05-12 20:09:08 | MASTER-SAAO | (14h 19m 06.91s , -10d 14m 28.5s) | C | 60 | 17.1 | 31730 | 2025-05-12 20:10:27 | MASTER-SAAO | (14h 19m 12.41s , -10d 13m 58.2s) | C | 60 | 17.2 | 31809 | 2025-05-12 20:11:47 | MASTER-SAAO | (14h 19m 09.57s , -10d 12m 28.8s) | C | 60 | 17.2 | 31869 | 2025-05-12 20:11:47 | MASTER-SAAO | (14h 19m 09.57s , -10d 12m 28.8s) | C | 180 | 17.6 | Coadd 31889 | 2025-05-12 20:13:06 | MASTER-SAAO | (14h 19m 09.61s , -10d 13m 58.7s) | C | 60 | 17.0 | 31968 | 2025-05-12 20:14:25 | MASTER-SAAO | (14h 19m 12.16s , -10d 12m 34.3s) | C | 60 | 17.0 | 32047 | 2025-05-12 20:15:44 | MASTER-SAAO | (14h 19m 07.13s , -10d 13m 22.0s) | C | 60 | 17.0 | 32107 | 2025-05-12 20:15:44 | MASTER-SAAO | (14h 19m 07.14s , -10d 13m 22.0s) | C | 180 | 17.6 | Coadd 32126 | 2025-05-12 20:17:04 | MASTER-SAAO | (14h 19m 05.72s , -10d 12m 20.9s) | C | 60 | 17.1 | 32206 | 2025-05-12 20:18:24 | MASTER-SAAO | (14h 19m 12.92s , -10d 13m 20.0s) | C | 60 | 17.2 | 32286 | 2025-05-12 20:19:43 | MASTER-SAAO | (14h 19m 06.56s , -10d 14m 18.8s) | C | 60 | 17.0 | 32346 | 2025-05-12 20:19:43 | MASTER-SAAO | (14h 19m 06.56s , -10d 14m 18.8s) | C | 180 | 17.5 | Coadd 32366 | 2025-05-12 20:21:04 | MASTER-SAAO | (14h 19m 13.61s , -10d 14m 04.5s) | C | 60 | 16.9 | 32446 | 2025-05-12 20:22:23 | MASTER-SAAO | (14h 19m 11.06s , -10d 12m 36.7s) | C | 60 | 17.0 | 32943 | 2025-05-12 20:30:40 | MASTER-SAAO | (14h 19m 12.88s , -10d 12m 10.3s) | C | 60 | 16.9 | 33003 | 2025-05-12 20:30:40 | MASTER-SAAO | (14h 19m 12.88s , -10d 12m 10.3s) | C | 180 | 17.4 | Coadd 33022 | 2025-05-12 20:32:00 | MASTER-SAAO | (14h 19m 18.93s , -10d 13m 09.3s) | C | 60 | 16.8 | 33102 | 2025-05-12 20:33:19 | MASTER-SAAO | (14h 19m 14.64s , -10d 14m 08.2s) | C | 60 | 16.8 | 33181 | 2025-05-12 20:34:39 | MASTER-SAAO | (14h 19m 21.08s , -10d 14m 06.4s) | C | 60 | 16.9 | 33241 | 2025-05-12 20:34:39 | MASTER-SAAO | (14h 19m 21.08s , -10d 14m 06.4s) | C | 180 | 17.5 | Coadd 33260 | 2025-05-12 20:35:58 | MASTER-SAAO | (14h 19m 18.22s , -10d 12m 20.5s) | C | 60 | 16.9 | 33340 | 2025-05-12 20:37:17 | MASTER-SAAO | (14h 19m 18.96s , -10d 14m 01.5s) | C | 60 | 16.8 | 33419 | 2025-05-12 20:38:37 | MASTER-SAAO | (14h 19m 22.19s , -10d 12m 23.8s) | C | 60 | 16.9 | 33499 | 2025-05-12 20:39:56 | MASTER-SAAO | (14h 19m 16.86s , -10d 13m 02.6s) | C | 60 | 16.8 | 33578 | 2025-05-12 20:41:16 | MASTER-SAAO | (14h 19m 18.30s , -10d 12m 01.7s) | C | 60 | 16.8 | 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/40446. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...