TITLE: GCN CIRCULAR NUMBER: 42962 SUBJECT: Fermi GRB 251202B: Global MASTER-Net observations report DATE: 25/12/02 19:00:24 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 [1] located in South Africa (South African Astronomical Observatory) started inspect of the Fermi GRB 251202B ( Fermi GBM team, GCN 42961) errorbox 566 sec after notice time and 598 sec after trigger time at 2025-12-02 18:37:01 UT, with upper limit up to 19.2 mag. Observations started at twilight. The observations began at zenith distance = 24 deg. The sun altitude is -12.7 deg. The galactic latitude b = -67 deg., longitude l = 38 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=3058648 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 629 | 2025-12-02 18:37:01 | MASTER-SAAO | (23h 04m 42.90s , -23d 23m 21.3s) | C | 60 | 17.6 | 629 | 2025-12-02 18:37:01 | MASTER-SAAO | (23h 06m 42.31s , -23d 38m 56.2s) | C | 60 | 18.4 | 689 | 2025-12-02 18:37:01 | MASTER-SAAO | (23h 06m 42.31s , -23d 38m 56.2s) | C | 180 | 19.2 | Coadd 708 | 2025-12-02 18:38:20 | MASTER-SAAO | (23h 04m 42.92s , -23d 23m 16.2s) | C | 60 | 17.6 | 708 | 2025-12-02 18:38:20 | MASTER-SAAO | (23h 06m 42.32s , -23d 38m 51.7s) | C | 60 | 18.4 | 787 | 2025-12-02 18:39:39 | MASTER-SAAO | (23h 04m 42.96s , -23d 23m 12.1s) | C | 60 | 17.7 | 787 | 2025-12-02 18:39:40 | MASTER-SAAO | (23h 06m 42.35s , -23d 38m 48.1s) | C | 60 | 18.4 | 866 | 2025-12-02 18:40:58 | MASTER-SAAO | (23h 04m 43.00s , -23d 23m 08.4s) | C | 60 | 17.7 | 866 | 2025-12-02 18:40:58 | MASTER-SAAO | (23h 06m 42.37s , -23d 38m 45.0s) | C | 60 | 18.5 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. [1] - V.M. Lipunov, V.G. Kornilov, E.S. Gorbovskoy, N.A. Tiurina & A.S.Kuznetsov, 2023, Astronomical Robotic Networks and Operative Multichanel Astrophysics, Lomonosov MSU PRESS, 591pp. http : // www.pereplet.ru/lipunov/625.html View this GCN Circular online at https://gcn.nasa.gov/circulars/42962. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...