TITLE: GCN CIRCULAR NUMBER: 38675 SUBJECT: Fermi GRB 241226A: Global MASTER-Net observations report DATE: 24/12/27 01:01:29 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 241226A ( Fermi GBM team, GCN 38674) errorbox 739 sec after notice time and 779 sec after trigger time at 2024-12-26 22:46:39 UT, with upper limit up to 19.3 mag. The observations began at zenith distance = 42 deg. The sun altitude is -34.6 deg. The galactic latitude b = -17 deg., longitude l = 196 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2723414 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 809 | 2024-12-26 22:46:39 | MASTER-SAAO | (05h 16m 55.09s , +06d 41m 59.3s) | C | 60 | 18.9 | 1088 | 2024-12-26 22:51:17 | MASTER-SAAO | (05h 25m 02.50s , +06d 42m 29.7s) | C | 60 | 18.9 | 1508 | 2024-12-26 22:58:18 | MASTER-SAAO | (05h 16m 58.65s , +06d 40m 57.5s) | C | 60 | 18.8 | 1588 | 2024-12-26 22:59:37 | MASTER-SAAO | (05h 15m 51.46s , +04d 47m 02.0s) | C | 60 | 19.1 | 1667 | 2024-12-26 23:00:56 | MASTER-SAAO | (05h 23m 55.34s , +04d 48m 51.0s) | C | 60 | 19.1 | 1749 | 2024-12-26 23:02:18 | MASTER-SAAO | (05h 24m 55.24s , +06d 42m 08.0s) | C | 60 | 19.2 | 2168 | 2024-12-26 23:09:17 | MASTER-SAAO | (05h 16m 55.62s , +06d 42m 52.8s) | C | 60 | 19.0 | 2247 | 2024-12-26 23:10:37 | MASTER-SAAO | (05h 15m 51.16s , +04d 47m 34.1s) | C | 60 | 19.2 | 2327 | 2024-12-26 23:11:56 | MASTER-SAAO | (05h 23m 55.37s , +04d 49m 20.3s) | C | 60 | 19.2 | 2406 | 2024-12-26 23:13:15 | MASTER-SAAO | (05h 24m 57.26s , +06d 42m 31.6s) | C | 60 | 19.3 | 2825 | 2024-12-26 23:20:14 | MASTER-SAAO | (05h 16m 54.46s , +06d 43m 25.1s) | C | 60 | 19.0 | 2904 | 2024-12-26 23:21:33 | MASTER-SAAO | (05h 15m 49.72s , +04d 47m 59.5s) | C | 60 | 18.9 | 2984 | 2024-12-26 23:22:53 | MASTER-SAAO | (05h 23m 54.50s , +04d 49m 40.3s) | C | 60 | 19.2 | 3063 | 2024-12-26 23:24:13 | MASTER-SAAO | (05h 24m 54.98s , +06d 42m 55.6s) | C | 60 | 19.0 | 6284 | 2024-12-27 00:17:53 | MASTER-SAAO | (05h 01m 18.02s , +06d 44m 53.0s) | C | 60 | 18.9 | 6547 | 2024-12-27 00:22:16 | MASTER-SAAO | (05h 16m 39.60s , +06d 44m 03.0s) | C | 60 | 18.8 | 6626 | 2024-12-27 00:23:35 | MASTER-SAAO | (05h 15m 39.99s , +04d 50m 13.3s) | C | 60 | 18.9 | 6705 | 2024-12-27 00:24:54 | MASTER-SAAO | (05h 23m 39.63s , +04d 51m 50.4s) | C | 60 | 18.2 | 6784 | 2024-12-27 00:26:14 | MASTER-SAAO | (05h 24m 46.30s , +06d 44m 30.7s) | C | 60 | 19.0 | 6864 | 2024-12-27 00:27:33 | MASTER-SAAO | (05h 09m 27.76s , +06d 46m 15.6s) | C | 60 | 19.1 | 6943 | 2024-12-27 00:28:53 | MASTER-SAAO | (05h 01m 17.79s , +06d 45m 27.7s) | C | 60 | 18.9 | 7023 | 2024-12-27 00:30:12 | MASTER-SAAO | (05h 14m 54.59s , +02d 57m 23.8s) | C | 60 | 18.8 | 7102 | 2024-12-27 00:31:31 | MASTER-SAAO | (05h 22m 50.49s , +02d 56m 25.5s) | C | 60 | 19.0 | 7182 | 2024-12-27 00:32:51 | MASTER-SAAO | (05h 00m 17.40s , +04d 52m 04.7s) | C | 60 | 19.0 | 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/38675. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...