TITLE: GCN CIRCULAR NUMBER: 38842 SUBJECT: Fermi GRB 250107B: Global MASTER-Net observations report DATE: 25/01/07 16:33:51 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 250107B ( Fermi GBM team, GCN 38839) errorbox 14186 sec after notice time and 14221 sec after trigger time at 2025-01-07 15:31:05 UT, with upper limit up to 19.3 mag. The observations began at zenith distance = 12 deg. The sun altitude is -55.2 deg.
The galactic latitude b = 28 deg., longitude l = 157 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2736509
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________
14251 | 2025-01-07 15:31:05 | MASTER-Tunka | (04h 13m 49.68s , +54d 32m 00.7s) | C | 60 | 19.1 | 14311 | 2025-01-07 15:31:05 | MASTER-Tunka | (04h 13m 49.68s , +54d 32m 00.8s) | C | 180 | 19.1 | Coadd 14483 | 2025-01-07 15:34:57 | MASTER-Tunka | (04h 27m 33.78s , +54d 31m 30.6s) | C | 60 | 19.3 | 14543 | 2025-01-07 15:34:57 | MASTER-Tunka | (04h 27m 33.77s , +54d 31m 30.6s) | C | 180 | 19.3 | Coadd 14557 | 2025-01-07 15:36:11 | MASTER-Tunka | (03h 58m 53.28s , +56d 25m 31.5s) | C | 60 | 18.8 | 14617 | 2025-01-07 15:36:11 | MASTER-Tunka | (03h 58m 53.29s , +56d 25m 31.6s) | C | 180 | 18.8 | Coadd 14719 | 2025-01-07 15:38:53 | MASTER-Tunka | (04h 13m 21.56s , +56d 24m 57.2s) | C | 60 | 19.0 | 14953 | 2025-01-07 15:42:46 | MASTER-Tunka | (04h 13m 49.60s , +54d 32m 46.9s) | C | 60 | 19.0 | 15109 | 2025-01-07 15:45:23 | MASTER-Tunka | (04h 27m 30.11s , +54d 32m 56.0s) | C | 60 | 19.1 | 15183 | 2025-01-07 15:46:37 | MASTER-Tunka | (03h 58m 51.42s , +56d 25m 51.6s) | C | 60 | 18.6 | 15803 | 2025-01-07 15:56:57 | MASTER-Tunka | (04h 13m 16.36s , +56d 26m 13.9s) | C | 60 | 17.8 | 16036 | 2025-01-07 16:00:50 | MASTER-Tunka | (04h 13m 42.42s , +54d 32m 55.6s) | C | 60 | 17.5 | 16206 | 2025-01-07 16:03:40 | MASTER-Tunka | (04h 27m 32.57s , +54d 33m 24.4s) | C | 60 | 17.0 | 16282 | 2025-01-07 16:04:56 | MASTER-Tunka | (03h 58m 39.55s , +56d 26m 20.1s) | C | 60 | 16.6 | 16530 | 2025-01-07 16:09:04 | MASTER-Tunka | (04h 13m 12.79s , +56d 26m 02.5s) | C | 60 | 17.4 | 16874 | 2025-01-07 16:14:47 | MASTER-Tunka | (04h 15m 44.55s , +52d 38m 47.2s) | C | 60 | 17.8 | 17283 | 2025-01-07 16:21:36 | MASTER-Tunka | (04h 01m 08.58s , +54d 33m 43.0s) | C | 60 | 18.4 | Filter C is a clear (unfiltred) band.
The observation and reduction will continue. The message may be cited.
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