TITLE: GCN CIRCULAR NUMBER: 40856 SUBJECT: Fermi GRB 250626A: Global MASTER-Net observations report DATE: 25/06/28 09:15:21 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) started inspect of the Fermi GRB 250626A ( Fermi GBM team, GCN 40845) errorbox 42909 sec after notice time and 42944 sec after trigger time at 2025-06-27 10:09:38 UT, with upper limit up to 20.6 mag. The observations began at zenith distance = 33 deg. The sun altitude is -17.4 deg.
The galactic latitude b = -60 deg., longitude l = 174 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2917440
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________
42975 | 2025-06-27 10:09:38 | MASTER-OAFA | (01h 27m 40.95s , -06d 22m 32.0s) | C | 60 | 20.0 | 43050 | 2025-06-27 10:10:53 | MASTER-OAFA | (01h 35m 38.27s , -06d 23m 08.1s) | C | 60 | 20.0 | 43110 | 2025-06-27 10:10:53 | MASTER-OAFA | (01h 35m 38.27s , -06d 23m 08.1s) | C | 180 | 20.6 | Coadd 43127 | 2025-06-27 10:12:11 | MASTER-OAFA | (01h 43m 25.19s , -08d 17m 09.9s) | C | 60 | 20.0 | 43187 | 2025-06-27 10:12:11 | MASTER-OAFA | (01h 43m 25.19s , -08d 17m 09.9s) | C | 180 | 20.5 | Coadd 43202 | 2025-06-27 10:13:26 | MASTER-OAFA | (01h 51m 23.61s , -08d 18m 09.1s) | C | 60 | 20.0 | 43262 | 2025-06-27 10:13:26 | MASTER-OAFA | (01h 51m 23.61s , -08d 18m 09.0s) | C | 180 | 20.6 | Coadd 43279 | 2025-06-27 10:14:43 | MASTER-OAFA | (01h 27m 42.13s , -06d 23m 32.1s) | C | 60 | 20.0 | 43356 | 2025-06-27 10:16:00 | MASTER-OAFA | (01h 35m 41.34s , -06d 22m 03.8s) | C | 60 | 20.0 | 43432 | 2025-06-27 10:17:15 | MASTER-OAFA | (01h 43m 21.97s , -08d 17m 48.3s) | C | 60 | 19.9 | 43507 | 2025-06-27 10:18:31 | MASTER-OAFA | (01h 51m 30.29s , -08d 16m 20.6s) | C | 60 | 19.9 | 43584 | 2025-06-27 10:19:48 | MASTER-OAFA | (01h 27m 36.11s , -06d 22m 51.4s) | C | 60 | 19.9 | 43662 | 2025-06-27 10:21:06 | MASTER-OAFA | (01h 35m 38.40s , -06d 21m 53.5s) | C | 60 | 19.9 | 43740 | 2025-06-27 10:22:24 | MASTER-OAFA | (01h 43m 24.60s , -08d 16m 55.6s) | C | 60 | 19.9 | 43817 | 2025-06-27 10:23:40 | MASTER-OAFA | (01h 51m 25.10s , -08d 17m 56.0s) | C | 60 | 19.9 | 43895 | 2025-06-27 10:24:58 | MASTER-OAFA | (01h 27m 42.16s , -06d 23m 26.4s) | C | 60 | 19.9 | 43955 | 2025-06-27 10:24:58 | MASTER-OAFA | (01h 27m 42.16s , -06d 23m 26.4s) | C | 180 | 20.4 | Coadd 43976 | 2025-06-27 10:26:20 | MASTER-OAFA | (01h 35m 41.71s , -06d 22m 14.2s) | C | 60 | 19.7 | 44036 | 2025-06-27 10:26:20 | MASTER-OAFA | (01h 35m 41.71s , -06d 22m 14.2s) | C | 180 | 20.3 | Coadd 44052 | 2025-06-27 10:27:35 | MASTER-OAFA | (01h 43m 22.34s , -08d 17m 41.1s) | C | 60 | 19.7 | 44128 | 2025-06-27 10:28:51 | MASTER-OAFA | (01h 51m 30.01s , -08d 16m 15.3s) | C | 60 | 19.9 | 44188 | 2025-06-27 10:28:51 | MASTER-OAFA | (01h 51m 30.01s , -08d 16m 15.3s) | C | 180 | 20.1 | Coadd 44205 | 2025-06-27 10:30:08 | MASTER-OAFA | (01h 27m 36.78s , -06d 22m 37.6s) | C | 60 | 19.6 | 44280 | 2025-06-27 10:31:23 | MASTER-OAFA | (01h 35m 38.45s , -06d 21m 40.2s) | C | 60 | 19.7 | 44357 | 2025-06-27 10:32:40 | MASTER-OAFA | (01h 43m 24.82s , -08d 16m 42.8s) | C | 60 | 19.6 | 44432 | 2025-06-27 10:33:55 | MASTER-OAFA | (01h 51m 24.68s , -08d 17m 43.2s) | C | 60 | 19.4 | 44509 | 2025-06-27 10:35:12 | MASTER-OAFA | (01h 27m 41.68s , -06d 23m 28.0s) | C | 60 | 19.3 | 44586 | 2025-06-27 10:36:29 | MASTER-OAFA | (01h 35m 42.04s , -06d 21m 57.7s) | C | 60 | 19.1 | 44661 | 2025-06-27 10:37:44 | MASTER-OAFA | (01h 43m 22.75s , -08d 17m 23.0s) | C | 60 | 19.2 | 44737 | 2025-06-27 10:39:00 | MASTER-OAFA | (01h 51m 30.94s , -08d 15m 47.5s) | C | 60 | 19.0 | 44813 | 2025-06-27 10:40:16 | MASTER-OAFA | (01h 27m 36.58s , -06d 22m 24.0s) | C | 60 | 18.7 | 44891 | 2025-06-27 10:41:35 | MASTER-OAFA | (01h 35m 38.99s , -06d 21m 26.8s) | C | 60 | 18.7 | 44967 | 2025-06-27 10:42:50 | MASTER-OAFA | (01h 43m 25.32s , -08d 16m 28.8s) | C | 60 | 18.5 | 45041 | 2025-06-27 10:44:05 | MASTER-OAFA | (01h 51m 24.79s , -08d 17m 30.2s) | C | 60 | 18.5 | 45119 | 2025-06-27 10:45:22 | MASTER-OAFA | (01h 27m 41.21s , -06d 23m 11.7s) | C | 60 | 18.2 | 45195 | 2025-06-27 10:46:39 | MASTER-OAFA | (01h 35m 42.25s , -06d 21m 27.0s) | C | 60 | 18.1 | 45270 | 2025-06-27 10:47:54 | MASTER-OAFA | (01h 43m 23.07s , -08d 17m 00.6s) | C | 60 | 16.4 | 123302 | 2025-06-28 08:28:25 | MASTER-OAFA | (01h 34m 53.55s , -07d 07m 29.7s) | C | 60 | 19.8 | 123376 | 2025-06-28 08:29:39 | MASTER-OAFA | (01h 34m 53.39s , -07d 06m 26.5s) | C | 60 | 19.8 | Filter C is a clear (unfiltred) band.
The observation and reduction will continue. The message may be cited.
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