TITLE: GCN CIRCULAR NUMBER: 42214 SUBJECT: Fermi GRB 251013A: Global MASTER-Net observations report DATE: 25/10/13 08:30:31 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 251013A ( Fermi GBM team, GCN 42213) errorbox 544 sec after notice time and 582 sec after trigger time at 2025-10-13 08:13:47 UT, with upper limit up to 19.4 mag. The observations began at zenith distance = 61 deg. The sun altitude is -22.2 deg. The galactic latitude b = -63 deg., longitude l = 140 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=3013630 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 642 | 2025-10-13 08:13:47 | MASTER-OAFA | (01h 20m 06.37s , -01d 28m 39.3s) | C | 120 | 19.1 | 778 | 2025-10-13 08:15:53 | MASTER-OAFA | (01h 20m 06.37s , -01d 28m 38.7s) | C | 140 | 19.3 | 940 | 2025-10-13 08:18:19 | MASTER-OAFA | (01h 20m 06.39s , -01d 28m 38.6s) | C | 170 | 19.4 | 1061 | 2025-10-13 08:21:15 | MASTER-OAFA | (01h 20m 06.42s , -01d 28m 38.7s) | C | 60 | 19.0 | 1126 | 2025-10-13 08:22:21 | MASTER-OAFA | (01h 20m 06.43s , -01d 28m 38.9s) | C | 60 | 18.9 | 1191 | 2025-10-13 08:23:26 | MASTER-OAFA | (01h 20m 06.45s , -01d 28m 38.8s) | C | 60 | 18.9 | 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/42214. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...