TITLE:   GCN CIRCULAR
NUMBER:  35942
SUBJECT: Fermi GRB 240317A: Global MASTER-Net observations report
DATE:    24/03/17 13:31:01 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-Amur robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Russia (Blagoveshchensk State Pedagogical University) started inspect of the Fermi GRB 240317A ( Fermi GBM team, GCN 35939) errorbox  12523 sec after notice time and 12555 sec after trigger time at 2024-03-17 13:13:10 UT, with upper limit up to  17.8 mag. The observations began at zenith distance = 69 deg. The sun  altitude  is -32.2 deg. 

MASTER-Tunka robotic telescope  located in Russia (Applied Physics Institute, Irkutsk State University) started inspect of the Fermi GRB 240317A errorbox  13217 sec after notice time and 13249 sec after trigger time at 2024-03-17 13:24:45 UT, with upper limit up to  13.5 mag. The observations began at zenith distance = 80 deg. The sun  altitude  is -20.7 deg. 

The galactic latitude b = 60 deg., longitude l = 24 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2400638

We obtain a following upper limits.  

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

   12585 | 2024-03-17 13:13:10 |         MASTER-Amur | (14h 48m 33.06s , +20d 16m 10.5s) |   C |    60 | 17.7 |        
   12665 | 2024-03-17 13:14:30 |         MASTER-Amur | (14h 57m 03.77s , +20d 17m 46.4s) |   C |    60 | 17.4 |        
   12745 | 2024-03-17 13:15:50 |         MASTER-Amur | (14h 59m 54.03s , +22d 11m 46.7s) |   C |    60 | 17.6 |        
   12825 | 2024-03-17 13:17:10 |         MASTER-Amur | (15h 08m 25.81s , +22d 11m 31.4s) |   C |    60 | 17.4 |        
   13067 | 2024-03-17 13:21:11 |         MASTER-Amur | (14h 38m 28.91s , +18d 21m 26.0s) |   C |    60 | 17.8 |        
   13146 | 2024-03-17 13:22:31 |         MASTER-Amur | (14h 46m 52.55s , +18d 23m 18.1s) |   C |    60 | 17.7 |        
   13280 | 2024-03-17 13:24:45 |        MASTER-Tunka | (14h 41m 05.02s , +21d 19m 39.8s) |   C |    60 | 13.5 |        
Filter C is a clear (unfiltred) band. 


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