TITLE: GCN CIRCULAR NUMBER: 40815 SUBJECT: Fermi GRB 250623A: Global MASTER-Net observations report DATE: 25/06/23 20:15:30 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) started inspect of the Fermi GRB 250623A ( Fermi GBM team, GCN 40814) errorbox 12254 sec after notice time and 12285 sec after trigger time at 2025-06-23 19:35:57 UT, with upper limit up to 19.6 mag. The observations began at zenith distance = 26 deg. The sun altitude is -48.5 deg.
The galactic latitude b = 38 deg., longitude l = 359 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2914124
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________
12315 | 2025-06-23 19:35:57 | MASTER-SAAO | (15h 27m 52.76s , -06d 33m 00.0s) | C | 60 | 19.2 | 12315 | 2025-06-23 19:35:57 | MASTER-SAAO | (15h 26m 04.67s , -06d 17m 23.3s) | C | 60 | 19.2 | 12408 | 2025-06-23 19:37:30 | MASTER-SAAO | (15h 35m 45.45s , -06d 34m 17.7s) | C | 60 | 19.2 | 12408 | 2025-06-23 19:37:30 | MASTER-SAAO | (15h 33m 57.55s , -06d 18m 40.9s) | C | 60 | 19.3 | 12502 | 2025-06-23 19:39:03 | MASTER-SAAO | (15h 23m 10.48s , -04d 22m 29.2s) | C | 60 | 19.5 | 12595 | 2025-06-23 19:40:36 | MASTER-SAAO | (15h 32m 55.26s , -04d 39m 53.0s) | C | 60 | 19.3 | 12595 | 2025-06-23 19:40:36 | MASTER-SAAO | (15h 31m 07.96s , -04d 24m 16.4s) | C | 60 | 19.3 | 12689 | 2025-06-23 19:42:11 | MASTER-SAAO | (15h 31m 46.60s , -08d 26m 56.3s) | C | 60 | 19.5 | 12689 | 2025-06-23 19:42:11 | MASTER-SAAO | (15h 29m 58.43s , -08d 11m 19.1s) | C | 60 | 19.5 | 12783 | 2025-06-23 19:43:44 | MASTER-SAAO | (15h 39m 47.59s , -08d 26m 17.1s) | C | 60 | 19.3 | 12783 | 2025-06-23 19:43:44 | MASTER-SAAO | (15h 37m 59.47s , -08d 10m 39.5s) | C | 60 | 19.4 | 12876 | 2025-06-23 19:45:18 | MASTER-SAAO | (15h 40m 02.82s , -04d 40m 16.4s) | C | 60 | 19.4 | 12876 | 2025-06-23 19:45:18 | MASTER-SAAO | (15h 38m 15.65s , -04d 24m 39.4s) | C | 60 | 19.5 | 12969 | 2025-06-23 19:46:51 | MASTER-SAAO | (15h 48m 06.97s , -04d 40m 30.1s) | C | 60 | 19.3 | 12969 | 2025-06-23 19:46:51 | MASTER-SAAO | (15h 46m 19.81s , -04d 24m 52.8s) | C | 60 | 19.4 | 13062 | 2025-06-23 19:48:24 | MASTER-SAAO | (15h 27m 56.33s , -06d 31m 53.7s) | C | 60 | 19.3 | 13062 | 2025-06-23 19:48:24 | MASTER-SAAO | (15h 26m 08.67s , -06d 16m 16.9s) | C | 60 | 19.4 | 13156 | 2025-06-23 19:49:57 | MASTER-SAAO | (15h 35m 55.61s , -06d 33m 31.4s) | C | 60 | 19.3 | 13156 | 2025-06-23 19:49:57 | MASTER-SAAO | (15h 34m 07.99s , -06d 17m 54.2s) | C | 60 | 19.4 | 13249 | 2025-06-23 19:51:30 | MASTER-SAAO | (15h 25m 07.12s , -04d 37m 46.5s) | C | 60 | 19.3 | 13249 | 2025-06-23 19:51:30 | MASTER-SAAO | (15h 23m 19.89s , -04d 22m 09.6s) | C | 60 | 19.6 | 13342 | 2025-06-23 19:53:04 | MASTER-SAAO | (15h 33m 00.14s , -04d 38m 44.7s) | C | 60 | 19.3 | 13342 | 2025-06-23 19:53:04 | MASTER-SAAO | (15h 31m 12.86s , -04d 23m 07.5s) | C | 60 | 19.4 | 13435 | 2025-06-23 19:54:37 | MASTER-SAAO | (15h 31m 52.38s , -08d 25m 39.2s) | C | 60 | 19.4 | 13435 | 2025-06-23 19:54:37 | MASTER-SAAO | (15h 30m 04.09s , -08d 10m 01.9s) | C | 60 | 19.5 | 13528 | 2025-06-23 19:56:10 | MASTER-SAAO | (15h 40m 00.69s , -08d 27m 01.6s) | C | 60 | 19.3 | 13528 | 2025-06-23 19:56:10 | MASTER-SAAO | (15h 38m 12.35s , -08d 11m 24.2s) | C | 60 | 19.5 | 13621 | 2025-06-23 19:57:43 | MASTER-SAAO | (15h 40m 11.81s , -04d 40m 00.8s) | C | 60 | 19.3 | 13621 | 2025-06-23 19:57:43 | MASTER-SAAO | (15h 38m 24.33s , -04d 24m 24.1s) | C | 60 | 19.6 | 13714 | 2025-06-23 19:59:16 | MASTER-SAAO | (15h 48m 14.27s , -04d 40m 05.3s) | C | 60 | 19.4 | 13714 | 2025-06-23 19:59:16 | MASTER-SAAO | (15h 46m 26.76s , -04d 24m 28.5s) | C | 60 | 19.5 | 13808 | 2025-06-23 20:00:49 | MASTER-SAAO | (15h 28m 03.37s , -06d 31m 40.0s) | C | 60 | 19.4 | 13808 | 2025-06-23 20:00:49 | MASTER-SAAO | (15h 26m 15.29s , -06d 16m 03.5s) | C | 60 | 19.6 | 13906 | 2025-06-23 20:02:28 | MASTER-SAAO | (15h 36m 02.97s , -06d 33m 23.3s) | C | 60 | 19.4 | 13906 | 2025-06-23 20:02:28 | MASTER-SAAO | (15h 34m 14.81s , -06d 17m 46.2s) | C | 60 | 19.5 | 13999 | 2025-06-23 20:04:01 | MASTER-SAAO | (15h 25m 14.02s , -04d 37m 33.0s) | C | 60 | 19.5 | Filter C is a clear (unfiltred) band.
The observation and reduction will continue. The message may be cited.
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