TITLE:   GCN CIRCULAR
NUMBER:  33483
SUBJECT: Fermi GRB 230316A: Global MASTER-Net observations report 
DATE:    23/03/16 22:15:40 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, D. Vlasenko, 
G.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov,  D.Cheryasov, Ya.Kechin
(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. Gres, N.M. Budnev
(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),

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


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 GRB 230316A ( Fermi GBM team, GCN 33481) errorbox  29242 sec after notice time and 29277 sec after trigger time at 2023-03-16 21:14:27 UT, with upper limit up to  18.3 mag. The observations began at zenith distance = 71 deg. The sun  altitude  is -49.7 deg. 

The galactic latitude b = -21 deg., longitude l = 330 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2204841

We obtain a following upper limits.  

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

   29307 | 2023-03-16 21:14:27 |         MASTER-SAAO | (17h 59m 53.97s , -65d 22m 36.4s) |   C |    60 | 18.2 |        
   29307 | 2023-03-16 21:14:27 |         MASTER-SAAO | (17h 58m 01.94s , -65d 22m 50.5s) |   C |    60 | 18.2 |        
   29399 | 2023-03-16 21:15:59 |         MASTER-SAAO | (18h 19m 10.39s , -65d 22m 26.0s) |   C |    60 | 18.1 |        
   29399 | 2023-03-16 21:15:59 |         MASTER-SAAO | (18h 17m 18.78s , -65d 22m 37.3s) |   C |    60 | 18.2 |        
   29479 | 2023-03-16 21:17:18 |         MASTER-SAAO | (17h 55m 39.92s , -63d 28m 28.8s) |   C |    60 | 18.1 |        
   29479 | 2023-03-16 21:17:18 |         MASTER-SAAO | (17h 53m 55.47s , -63d 28m 39.4s) |   C |    60 | 18.3 |        
   29558 | 2023-03-16 21:18:38 |         MASTER-SAAO | (18h 13m 37.19s , -63d 26m 55.0s) |   C |    60 | 18.0 |        
   29558 | 2023-03-16 21:18:38 |         MASTER-SAAO | (18h 11m 53.06s , -63d 27m 05.8s) |   C |    60 | 18.2 |        
   29649 | 2023-03-16 21:20:09 |         MASTER-SAAO | (18h 06m 10.38s , -67d 14m 35.3s) |   C |    60 | 18.3 |        
   29649 | 2023-03-16 21:20:09 |         MASTER-SAAO | (18h 04m 09.36s , -67d 14m 45.8s) |   C |    60 | 18.3 |        
   29729 | 2023-03-16 21:21:29 |         MASTER-SAAO | (18h 26m 57.03s , -67d 15m 48.7s) |   C |    60 | 18.2 |        
   29729 | 2023-03-16 21:21:29 |         MASTER-SAAO | (18h 24m 56.18s , -67d 15m 59.6s) |   C |    60 | 18.3 |        
   29821 | 2023-03-16 21:23:00 |         MASTER-SAAO | (18h 27m 58.63s , -63d 28m 57.2s) |   C |    60 | 18.1 |        
   29821 | 2023-03-16 21:23:01 |         MASTER-SAAO | (18h 29m 42.75s , -63d 28m 46.6s) |   C |    60 | 17.9 |        
Filter C is a clear (unfiltred) band. 


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