TITLE:   GCN CIRCULAR
NUMBER:  27498
SUBJECT: Fermi GRB 200405A: Global MASTER-Net observations report 
DATE:    20/04/06 00:15:23 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov@xray.sai.msu.ru>

V. Lipunov, E. Gorbovskoy, V.Kornilov, N.Tyurina, P.Balanutsa, A.Kuznetsov, F.Balakin, 
V.Vladimirov, D. Vlasenko, I.Gorbunov, D.Zimnukhov, V.Senik, T.Pogrosheva,
D.Kuvshinov,  D. Cheryasov
(Lomonosov Moscow State University, SAI, Physics Department),

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

H.Levato 
(Instituto de Ciencias Astronomicas, de la Tierra y del Espacio ICATE),

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

D. Buckley 
(South African Astronomical Observatory),

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

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

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




MASTER-OAFA robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Argentina (OAFA observatory of San Juan National University) started inspect of the Fermi GRB 200405A ( Fermi GBM team, GCN 27496) errorbox  49435 sec after notice time and 49462 sec after trigger time at 2020-04-05 23:11:44 UT, with upper limit up to  16.8 mag. Observations started at twilight.  The observations began at zenith distance = 47 deg. The sun  altitude  is -10.7 deg. 

The galactic latitude b = -48 deg., longitude l = 226 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1330172

We obtain a following upper limits.  

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

   49493 | 2020-04-05 23:11:44 |         MASTER-OAFA | (03h 54m 51.61s , -30d 03m 29.4s) |   C |    60 | 16.4 |        
   49584 | 2020-04-05 23:13:15 |         MASTER-OAFA | (03h 46m 11.39s , -26d 03m 32.4s) |   C |    60 | 16.4 |        
   49675 | 2020-04-05 23:14:46 |         MASTER-OAFA | (04h 08m 21.33s , -28d 02m 21.9s) |   C |    60 | 16.6 |        
   49766 | 2020-04-05 23:16:17 |         MASTER-OAFA | (03h 50m 13.31s , -28d 01m 54.2s) |   C |    60 | 16.8 |        
   49857 | 2020-04-05 23:17:48 |         MASTER-OAFA | (03h 59m 22.88s , -28d 02m 38.1s) |   C |    60 | 16.8 |        
Filter C is a clear (unfiltred) band. 


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