GCN Circular 39766
Subject
Fermi trigger No 763933627: Global MASTER-Net observations report
Date
2025-03-17T23:02:10Z (18 days ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
Via
email
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-SAAO robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) started inspect of the Fermi GRB250317.82 (trigger No 763933627,04h 54m 02.40s , -35d 41m 24.0s, R=1.38) errorbox 18 sec after notice time and 9688 sec after trigger time at 2025-03-17 22:28:31 UT, with upper limit up to 18.0 mag. The observations began at zenith distance = 79 deg. The sun altitude is -56.6 deg.
The galactic latitude b = -38 deg., longitude l = 238 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=2814784
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
9718 | 2025-03-17 22:28:31 | MASTER-SAAO | (04h 53m 49.54s , -35d 43m 51.2s) | C | 60 | 17.4 |
9778 | 2025-03-17 22:28:31 | MASTER-SAAO | (04h 53m 49.54s , -35d 43m 51.2s) | C | 180 | 18.0 | Coadd
9798 | 2025-03-17 22:29:50 | MASTER-SAAO | (04h 53m 50.06s , -35d 43m 48.1s) | C | 60 | 17.5 |
9877 | 2025-03-17 22:31:09 | MASTER-SAAO | (04h 53m 50.57s , -35d 43m 45.2s) | C | 60 | 17.4 |
9956 | 2025-03-17 22:32:28 | MASTER-SAAO | (04h 53m 51.09s , -35d 43m 42.4s) | C | 60 | 17.4 |
Filter C is a clear (unfiltred) band.
The observation and reduction will continue.
The message may be cited.