TITLE: GCN CIRCULAR NUMBER: 39806 SUBJECT: Fermi GRB 250320B: Global MASTER-Net observations report DATE: 25/03/21 09:16:08 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-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 250320B ( Fermi GBM team, GCN 39792) errorbox 33041 sec after notice time and 33077 sec after trigger time at 2025-03-21 08:26:39 UT, with upper limit up to 18.4 mag. The observations began at zenith distance = 12 deg. The sun altitude is -28.6 deg.
The galactic latitude b = 16 deg., longitude l = 357 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2818681
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________
33098 | 2025-03-21 08:26:39 | MASTER-OAFA | (16h 26m 20.48s , -22d 13m 22.4s) | C | 40 | 17.1 | 33138 | 2025-03-21 08:26:39 | MASTER-OAFA | (16h 26m 20.49s , -22d 13m 22.3s) | C | 120 | 17.8 | Coadd 33108 | 2025-03-21 08:26:40 | MASTER-OAFA | (16h 36m 11.47s , -21d 49m 19.6s) | C | 60 | 18.3 | 33173 | 2025-03-21 08:27:55 | MASTER-OAFA | (16h 26m 22.64s , -22d 11m 46.3s) | C | 40 | 17.2 | 33184 | 2025-03-21 08:27:55 | MASTER-OAFA | (16h 36m 13.62s , -21d 47m 42.5s) | C | 60 | 18.3 | 33249 | 2025-03-21 08:29:10 | MASTER-OAFA | (16h 26m 17.85s , -22d 12m 32.3s) | C | 40 | 17.2 | 33259 | 2025-03-21 08:29:10 | MASTER-OAFA | (16h 36m 08.92s , -21d 48m 27.6s) | C | 60 | 18.4 | 33354 | 2025-03-21 08:30:25 | MASTER-OAFA | (16h 26m 16.38s , -22d 11m 33.0s) | C | 100 | 17.5 | 33484 | 2025-03-21 08:30:25 | MASTER-OAFA | (16h 26m 16.37s , -22d 11m 32.9s) | C | 360 | 18.2 | Coadd 33364 | 2025-03-21 08:30:26 | MASTER-OAFA | (16h 36m 07.07s , -21d 47m 24.6s) | C | 120 | 15.3 | 33490 | 2025-03-21 08:32:41 | MASTER-OAFA | (16h 26m 23.41s , -22d 12m 34.3s) | C | 100 | 17.5 | 33530 | 2025-03-21 08:32:41 | MASTER-OAFA | (16h 26m 23.41s , -22d 12m 34.3s) | C | 180 | 17.9 | Coadd 33625 | 2025-03-21 08:34:57 | MASTER-OAFA | (16h 26m 17.86s , -22d 13m 34.9s) | C | 100 | 17.5 | 33791 | 2025-03-21 08:37:12 | MASTER-OAFA | (16h 26m 22.80s , -22d 13m 29.4s) | C | 160 | 17.7 | 33928 | 2025-03-21 08:40:29 | MASTER-OAFA | (16h 26m 20.00s , -22d 12m 03.3s) | C | 40 | 17.1 | 33938 | 2025-03-21 08:40:29 | MASTER-OAFA | (16h 36m 11.27s , -21d 47m 56.2s) | C | 60 | 18.3 | 34002 | 2025-03-21 08:41:44 | MASTER-OAFA | (16h 26m 19.86s , -22d 13m 31.8s) | C | 40 | 17.2 | 34013 | 2025-03-21 08:41:44 | MASTER-OAFA | (16h 36m 11.25s , -21d 49m 24.6s) | C | 60 | 18.3 | 34077 | 2025-03-21 08:42:58 | MASTER-OAFA | (16h 26m 22.13s , -22d 11m 55.1s) | C | 40 | 17.1 | 34087 | 2025-03-21 08:42:59 | MASTER-OAFA | (16h 36m 13.43s , -21d 47m 47.9s) | C | 60 | 18.3 | Filter C is a clear (unfiltred) band.
The observation and reduction will continue. The message may be cited.
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