TITLE:   GCN CIRCULAR
NUMBER:  35991
SUBJECT: Fermi GRB 240328A: Global MASTER-Net observations report
DATE:    24/03/29 17:30:52 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>

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 GRB 240328A ( Fermi GBM team, GCN 35986) errorbox  1 days 15952 sec after notice time and 1 days 15986 sec after trigger time at 2024-03-29 16:47:48 UT, with upper limit up to  17.5 mag. The observations began at zenith distance = 75 deg. The sun  altitude  is -35.1 deg. 

The galactic latitude b = 41 deg., longitude l =  0 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2409243

We obtain a following upper limits.  

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

  102416 | 2024-03-29 16:47:48 |        MASTER-Tunka | (14h 43m 59.49s , -16d 29m 36.2s) |   C |    60 | 16.7 |        
  102417 | 2024-03-29 16:47:49 |        MASTER-Tunka | (14h 45m 17.79s , -15d 46m 24.1s) |   C |    60 | 17.5 |        
  102503 | 2024-03-29 16:49:15 |        MASTER-Tunka | (14h 59m 41.92s , -16d 31m 40.9s) |   C |    60 | 15.7 |        
  102504 | 2024-03-29 16:49:16 |        MASTER-Tunka | (15h 01m 00.09s , -15d 48m 28.9s) |   C |    60 | 16.2 |        
  102591 | 2024-03-29 16:50:43 |        MASTER-Tunka | (14h 51m 54.70s , -14d 36m 43.5s) |   C |    60 | 14.7 |        
  102625 | 2024-03-29 16:51:17 |        MASTER-Tunka | (14h 53m 11.85s , -13d 53m 33.8s) |   C |    60 | 15.4 |  Coadd 
  102705 | 2024-03-29 16:52:37 |        MASTER-Tunka | (15h 10m 06.13s , -17d 41m 11.5s) |   C |    60 | 14.3 |  Coadd 
  102838 | 2024-03-29 16:54:50 |        MASTER-Tunka | (15h 07m 35.00s , -14d 36m 19.1s) |   C |    60 | 15.5 |        
  102872 | 2024-03-29 16:55:24 |        MASTER-Tunka | (15h 08m 52.07s , -13d 53m 10.3s) |   C |    60 | 15.8 |  Coadd 
  104618 | 2024-03-29 17:24:30 |        MASTER-Tunka | (14h 43m 57.08s , -16d 28m 17.8s) |   C |    60 | 13.5 |        
  104666 | 2024-03-29 17:25:18 |        MASTER-Tunka | (14h 45m 14.95s , -15d 45m 08.6s) |   C |    60 | 14.5 |  Coadd 
Filter C is a clear (unfiltred) band. 


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