TITLE: GCN CIRCULAR NUMBER: 39432 SUBJECT: Fermi GRB 250223A: Global MASTER-Net observations report DATE: 25/02/23 18:31:10 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs lipunov@xray.sai.msu.ru
V.Lipunov, E.Gorbovskoy, N.Tiurina, P.Balanutsa, , D.Vlasenko, I.Panchenko, A.Kuznetsov, G.Antipov, A.Sankovich, A.Sosnovskij, Yu.Tselik, M.Gulyaev, 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. 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 250223A ( Fermi GBM team, GCN 39430) errorbox 6037 sec after notice time and 6071 sec after trigger time at 2025-02-23 18:17:23 UT, with upper limit up to 17.8 mag. Observations started at twilight. The observations began at zenith distance = 81 deg. The sun altitude is -12.4 deg.
The galactic latitude b = -61 deg., longitude l = 358 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2788279
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________
6101 | 2025-02-23 18:17:23 | MASTER-SAAO | (21h 30m 33.95s , -55d 53m 54.3s) | C | 60 | 16.5 | 6180 | 2025-02-23 18:18:42 | MASTER-SAAO | (21h 44m 51.61s , -55d 55m 08.8s) | C | 60 | 16.9 | 6260 | 2025-02-23 18:20:01 | MASTER-SAAO | (21h 48m 30.70s , -54d 02m 03.5s) | C | 60 | 16.9 | 6339 | 2025-02-23 18:21:20 | MASTER-SAAO | (22h 02m 01.64s , -54d 00m 54.6s) | C | 60 | 17.2 | 6419 | 2025-02-23 18:22:40 | MASTER-SAAO | (21h 57m 39.63s , -55d 54m 33.4s) | C | 60 | 17.4 | 6498 | 2025-02-23 18:23:59 | MASTER-SAAO | (22h 11m 47.32s , -55d 55m 37.0s) | C | 60 | 17.8 | 6577 | 2025-02-23 18:25:18 | MASTER-SAAO | (22h 06m 14.56s , -52d 07m 28.6s) | C | 60 | 17.5 | 6656 | 2025-02-23 18:26:38 | MASTER-SAAO | (22h 19m 06.47s , -52d 08m 45.6s) | C | 60 | 17.8 | Filter C is a clear (unfiltred) band.
The observation and reduction will continue. The message may be cited.
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