GCN Circular 39875
Subject
Fermi trigger No 764700395: Global MASTER-Net observations report
Date
2025-03-27T00:17:45Z (5 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 GRB250326.70 (trigger No 764700395,20h 23m 40.80s , -38d 57m 36.0s, R=9.31) errorbox 21402 sec after notice time and 21440 sec after trigger time at 2025-03-26 22:43:51 UT, with upper limit up to 18.3 mag. The observations began at zenith distance = 79 deg. The sun altitude is -60.5 deg.
The galactic latitude b = -35 deg., longitude l = 3 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=2823964
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
21471 | 2025-03-26 22:43:51 | MASTER-SAAO | (19h 31m 14.42s , -44d 23m 39.6s) | C | 60 | 17.6 |
22457 | 2025-03-26 23:00:16 | MASTER-SAAO | (19h 31m 09.11s , -44d 23m 35.8s) | C | 60 | 17.9 |
23441 | 2025-03-26 23:16:41 | MASTER-SAAO | (19h 31m 11.68s , -44d 24m 08.8s) | C | 60 | 18.1 |
23760 | 2025-03-26 23:21:59 | MASTER-SAAO | (19h 51m 37.14s , -40d 37m 28.5s) | C | 60 | 18.0 |
23840 | 2025-03-26 23:23:19 | MASTER-SAAO | (20h 02m 03.62s , -40d 38m 43.3s) | C | 60 | 17.9 |
24085 | 2025-03-26 23:27:25 | MASTER-SAAO | (19h 31m 10.94s , -44d 25m 46.3s) | C | 60 | 18.2 |
24428 | 2025-03-26 23:33:08 | MASTER-SAAO | (19h 51m 36.38s , -40d 37m 36.0s) | C | 60 | 18.1 |
24508 | 2025-03-26 23:34:27 | MASTER-SAAO | (20h 02m 03.88s , -40d 38m 48.3s) | C | 60 | 18.1 |
24746 | 2025-03-26 23:38:25 | MASTER-SAAO | (19h 31m 09.95s , -44d 26m 12.3s) | C | 60 | 18.2 |
24825 | 2025-03-26 23:39:44 | MASTER-SAAO | (19h 58m 05.51s , -38d 43m 52.8s) | C | 60 | 18.0 |
24904 | 2025-03-26 23:41:04 | MASTER-SAAO | (20h 08m 21.86s , -38d 43m 07.6s) | C | 60 | 18.0 |
25063 | 2025-03-26 23:43:42 | MASTER-SAAO | (19h 51m 30.03s , -40d 38m 44.7s) | C | 60 | 18.2 |
25142 | 2025-03-26 23:45:02 | MASTER-SAAO | (20h 02m 08.19s , -40d 38m 53.4s) | C | 60 | 18.1 |
25380 | 2025-03-26 23:49:00 | MASTER-SAAO | (19h 31m 12.73s , -44d 24m 47.9s) | C | 60 | 18.3 |
25459 | 2025-03-26 23:50:19 | MASTER-SAAO | (19h 58m 04.80s , -38d 44m 00.9s) | C | 60 | 18.2 |
25539 | 2025-03-26 23:51:38 | MASTER-SAAO | (20h 08m 21.86s , -38d 43m 13.0s) | C | 60 | 18.0 |
25618 | 2025-03-26 23:52:58 | MASTER-SAAO | (20h 17m 35.18s , -38d 45m 24.9s) | C | 60 | 18.0 |
25698 | 2025-03-26 23:54:17 | MASTER-SAAO | (20h 27m 56.49s , -38d 45m 32.8s) | C | 60 | 17.9 |
25777 | 2025-03-26 23:55:36 | MASTER-SAAO | (19h 51m 31.85s , -40d 37m 07.5s) | C | 60 | 18.3 |
Filter C is a clear (unfiltred) band.
The observation and reduction will continue.
The message may be cited.