GCN Circular 35981

V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik,  D. Vlasenko,
G.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij
(Lomonosov Moscow State University, SAI, Physics Department),

R. Podesta, C.Lopez, F. Podesta, C.Francile
(Observatorio Astronomico Felix Aguilar OAFA),

R. Rebolo, M. Serra
(The Instituto de Astrofisica de Canarias),

D. Buckley
(South African Astronomical Observatory),

O.A. Gress, N.M. Budnev, O.Ershova
(Irkutsk State University, API),

L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,
A.R.Corella, L.H.Rodriguez
(INAOE, Guillermo Haro Astrophysics Observatory),

A. Tlatov, D. Dormidontov
(Kislovodsk Solar Station of the Pulkovo Observatory),

V. Yurkov, A. Gabovich
(Blagoveschensk Educational State University)

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 GRB240325.92 (trigger No 733097506,01h 55m 00.00s , +01d 54m 00.0s, R=30.45) errorbox  54024 sec after notice time and 54058 sec after trigger time at 2024-03-26 13:12:40 UT, with upper limit up to  14.7 mag. Observations started at twilight.  The observations began at zenith distance = 72 deg. The sun  altitude  is -16.4 deg. 

MASTER-Kislovodsk robotic telescope  located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the Fermi GRB240325.92 errorbox  65955 sec after notice time and 65989 sec after trigger time at 2024-03-26 16:31:31 UT, with upper limit up to  18.0 mag. Observations started at twilight.  The observations began at zenith distance = 62 deg. The sun  altitude  is -11.9 deg. 

The galactic latitude b = -57 deg., longitude l = 154 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2406794

We obtain a following upper limits.  

Tmid-T0  |      Date Time      |          Site       |             Coord (J2000)          |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________

   54088 | 2024-03-26 13:12:40 |        MASTER-Tunka | (02h 55m 06.52s , +17d 04m 35.9s) |   C |    60 | 13.8 |        
   54089 | 2024-03-26 13:12:40 |        MASTER-Tunka | (02h 53m 52.29s , +16d 28m 26.9s) |   C |    60 | 14.7 |        
   66020 | 2024-03-26 16:31:31 |   MASTER-Kislovodsk | (02h 30m 22.81s , +28d 07m 21.0s) |   C |    60 | 14.9 |        
   66261 | 2024-03-26 16:35:32 |   MASTER-Kislovodsk | (02h 32m 11.32s , +25d 51m 11.9s) |   C |    60 | 16.1 |        
   66261 | 2024-03-26 16:35:32 |   MASTER-Kislovodsk | (02h 27m 55.78s , +26d 12m 05.8s) |   C |    60 | 16.4 |        
   66341 | 2024-03-26 16:36:52 |   MASTER-Kislovodsk | (02h 54m 37.58s , +16d 22m 18.5s) |   C |    60 | 16.1 |        
   66341 | 2024-03-26 16:36:52 |   MASTER-Kislovodsk | (02h 50m 39.80s , +16d 43m 12.7s) |   C |    60 | 16.7 |        
   66983 | 2024-03-26 16:47:34 |   MASTER-Kislovodsk | (02h 34m 50.66s , +27d 45m 12.9s) |   C |    60 | 17.2 |        
   66983 | 2024-03-26 16:47:34 |   MASTER-Kislovodsk | (02h 30m 31.07s , +28d 06m 05.3s) |   C |    60 | 18.0 |        
   67223 | 2024-03-26 16:51:34 |   MASTER-Kislovodsk | (02h 32m 17.68s , +25d 52m 26.7s) |   C |    60 | 17.4 |        
   67223 | 2024-03-26 16:51:34 |   MASTER-Kislovodsk | (02h 28m 03.93s , +26d 13m 16.7s) |   C |    60 | 17.9 |        
   67303 | 2024-03-26 16:52:54 |   MASTER-Kislovodsk | (02h 54m 31.95s , +16d 22m 24.3s) |   C |    60 | 17.2 |        
   67303 | 2024-03-26 16:52:54 |   MASTER-Kislovodsk | (02h 50m 35.97s , +16d 43m 13.4s) |   C |    60 | 17.9 |        
   67944 | 2024-03-26 17:03:35 |   MASTER-Kislovodsk | (02h 34m 44.27s , +27d 45m 18.2s) |   C |    60 | 17.3 |        
   67944 | 2024-03-26 17:03:35 |   MASTER-Kislovodsk | (02h 30m 26.14s , +28d 06m 06.7s) |   C |    60 | 18.0 |        
   68185 | 2024-03-26 17:07:36 |   MASTER-Kislovodsk | (02h 32m 10.21s , +25d 50m 06.1s) |   C |    60 | 16.9 |        
   68185 | 2024-03-26 17:07:36 |   MASTER-Kislovodsk | (02h 27m 58.10s , +26d 10m 51.5s) |   C |    60 | 17.6 |        
   68265 | 2024-03-26 17:08:56 |   MASTER-Kislovodsk | (02h 54m 36.53s , +16d 21m 19.8s) |   C |    60 | 16.9 |        
   68265 | 2024-03-26 17:08:56 |   MASTER-Kislovodsk | (02h 50m 42.00s , +16d 42m 04.9s) |   C |    60 | 17.5 |        
   68345 | 2024-03-26 17:10:16 |   MASTER-Kislovodsk | (02h 51m 38.04s , +12d 34m 19.1s) |   C |    60 | 16.8 |        
   68345 | 2024-03-26 17:10:16 |   MASTER-Kislovodsk | (02h 47m 49.51s , +12d 54m 58.2s) |   C |    60 | 17.1 |        
   68425 | 2024-03-26 17:11:37 |   MASTER-Kislovodsk | (02h 52m 59.66s , +14d 27m 09.9s) |   C |    60 | 17.0 |        
   68425 | 2024-03-26 17:11:37 |   MASTER-Kislovodsk | (02h 49m 08.58s , +14d 47m 49.7s) |   C |    60 | 17.5 |        
   68666 | 2024-03-26 17:15:37 |   MASTER-Kislovodsk | (03h 12m 19.95s , +18d 17m 12.4s) |   C |    60 | 17.0 |        
   68666 | 2024-03-26 17:15:37 |   MASTER-Kislovodsk | (03h 08m 20.63s , +18d 38m 03.1s) |   C |    60 | 17.6 |        
Filter C is a clear (unfiltred) band. 


The observation and reduction will continue. 
The message may be cited.