TITLE: GCN CIRCULAR NUMBER: 39304 SUBJECT: Fermi GRB 250212A: Global MASTER-Net observations report DATE: 25/02/12 21:16:20 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-Tunka robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Applied Physics Institute, Irkutsk State University) started inspect of the Fermi GRB 250212A ( Fermi GBM team, GCN 39294) errorbox 69293 sec after notice time and 69339 sec after trigger time at 2025-02-12 20:05:33 UT, with upper limit up to 15.8 mag. The observations began at zenith distance = 46 deg. The sun altitude is -40.0 deg. The galactic latitude b = 21 deg., longitude l = 82 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2775797 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 69341 | 2025-02-12 20:05:33 | MASTER-Tunka | (17h 48m 16.26s , +54d 08m 37.4s) | C | 1 | 15.6 | 69443 | 2025-02-12 20:07:16 | MASTER-Tunka | (17h 47m 16.27s , +56d 03m 20.7s) | C | 1 | 15.8 | 69694 | 2025-02-12 20:11:27 | MASTER-Tunka | (18h 25m 56.36s , +61d 43m 25.6s) | C | 1 | 15.3 | 69939 | 2025-02-12 20:15:31 | MASTER-Tunka | (17h 48m 15.51s , +54d 10m 22.0s) | C | 1 | 15.3 | 70145 | 2025-02-12 20:18:58 | MASTER-Tunka | (17h 47m 19.31s , +56d 03m 48.4s) | C | 1 | 15.6 | 70398 | 2025-02-12 20:23:10 | MASTER-Tunka | (18h 25m 59.43s , +61d 42m 08.6s) | C | 1 | 15.4 | 70557 | 2025-02-12 20:25:50 | MASTER-Tunka | (17h 48m 21.23s , +54d 09m 57.1s) | C | 1 | 15.6 | 70753 | 2025-02-12 20:29:06 | MASTER-Tunka | (17h 47m 14.86s , +56d 04m 17.1s) | C | 1 | 15.2 | 71065 | 2025-02-12 20:34:18 | MASTER-Tunka | (18h 26m 02.66s , +61d 42m 45.1s) | C | 1 | 15.3 | 71229 | 2025-02-12 20:37:02 | MASTER-Tunka | (17h 48m 21.82s , +54d 10m 29.4s) | C | 1 | 15.4 | 71244 | 2025-02-12 20:37:16 | MASTER-Tunka | (18h 15m 35.48s , +54d 07m 19.0s) | C | 1 | 15.2 | 71258 | 2025-02-12 20:37:30 | MASTER-Tunka | (18h 16m 07.40s , +56d 01m 18.4s) | C | 1 | 15.2 | 71268 | 2025-02-12 20:37:41 | MASTER-Tunka | (17h 50m 20.80s , +52d 17m 18.1s) | C | 1 | 15.4 | 71278 | 2025-02-12 20:37:51 | MASTER-Tunka | (17h 53m 18.75s , +50d 21m 26.9s) | C | 1 | 15.4 | 71291 | 2025-02-12 20:38:04 | MASTER-Tunka | (18h 17m 53.75s , +57d 56m 40.2s) | C | 1 | 14.6 | 71307 | 2025-02-12 20:38:19 | MASTER-Tunka | (18h 21m 02.65s , +59d 49m 51.2s) | C | 1 | 14.9 | 71400 | 2025-02-12 20:39:52 | MASTER-Tunka | (17h 47m 19.76s , +56d 03m 54.7s) | C | 1 | 15.1 | 71741 | 2025-02-12 20:45:34 | MASTER-Tunka | (18h 26m 03.43s , +61d 43m 48.0s) | C | 1 | 13.7 | 72033 | 2025-02-12 20:50:25 | MASTER-Tunka | (17h 48m 21.88s , +54d 11m 51.0s) | C | 1 | 12.4 | 72044 | 2025-02-12 20:50:36 | MASTER-Tunka | (18h 15m 41.15s , +54d 07m 56.4s) | C | 1 | 12.3 | 72053 | 2025-02-12 20:50:46 | MASTER-Tunka | (18h 16m 10.34s , +56d 03m 20.5s) | C | 1 | 12.1 | 72065 | 2025-02-12 20:50:57 | MASTER-Tunka | (17h 50m 19.79s , +52d 17m 00.3s) | C | 1 | 12.2 | 72075 | 2025-02-12 20:51:07 | MASTER-Tunka | (17h 53m 17.59s , +50d 23m 48.8s) | C | 1 | 12.2 | 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/39304. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...