TITLE: GCN CIRCULAR NUMBER: 42585 SUBJECT: Fermi GRB 251105A: Global MASTER-Net observations report DATE: 25/11/05 05:16:15 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 251105A ( Fermi GBM team, GCN 42584) errorbox 129 sec after notice time and 150 sec after trigger time at 2025-11-05 04:43:37 UT, with upper limit up to 18.3 mag. The observations began at zenith distance = 43 deg. The sun altitude is -43.0 deg. The galactic latitude b = -25 deg., longitude l = 190 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=3033298 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 166 | 2025-11-05 04:43:37 | MASTER-OAFA | (04h 39m 45.81s , +05d 19m 45.6s) | C | 30 | 17.7 | 207 | 2025-11-05 04:44:13 | MASTER-OAFA | (04h 39m 45.84s , +05d 19m 46.9s) | C | 40 | 17.9 | 258 | 2025-11-05 04:44:59 | MASTER-OAFA | (04h 39m 45.88s , +05d 19m 48.6s) | C | 50 | 18.1 | 319 | 2025-11-05 04:45:55 | MASTER-OAFA | (04h 39m 45.91s , +05d 19m 50.3s) | C | 60 | 18.0 | 390 | 2025-11-05 04:47:01 | MASTER-OAFA | (04h 39m 45.96s , +05d 19m 52.4s) | C | 70 | 18.1 | 957 | 2025-11-05 04:56:33 | MASTER-OAFA | (04h 38m 41.39s , +07d 10m 46.5s) | C | 60 | 18.2 | 1023 | 2025-11-05 04:57:38 | MASTER-OAFA | (04h 38m 41.37s , +07d 10m 48.1s) | C | 60 | 18.3 | 1088 | 2025-11-05 04:58:44 | MASTER-OAFA | (04h 38m 41.40s , +07d 10m 49.8s) | C | 60 | 18.3 | 1154 | 2025-11-05 04:59:50 | MASTER-OAFA | (04h 38m 41.39s , +07d 10m 51.5s) | C | 60 | 18.3 | 1219 | 2025-11-05 05:00:55 | MASTER-OAFA | (04h 38m 41.39s , +07d 10m 53.2s) | C | 60 | 18.3 | 1285 | 2025-11-05 05:02:01 | MASTER-OAFA | (04h 38m 41.39s , +07d 10m 54.7s) | C | 60 | 18.3 | 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/42585. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...