TITLE:   GCN CIRCULAR
NUMBER:  31927
SUBJECT: Fermi  trigger No 672093919: Global MASTER-Net observations report 
DATE:    22/04/20 23:30:19 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-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 GRB220419.86 (trigger No 672093919,01h 06m 40.01s , +10d 16m 59.9s, R=35.2833) errorbox  47977 sec after notice time and 48006 sec after trigger time at 2022-04-20 10:05:20 UT, with upper limit up to  16.1 mag. Observations started at twilight.  The observations began at zenith distance = 57 deg. The sun  altitude  is -11.9 deg. 

The galactic latitude b = -52 deg., longitude l = 130 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1948536

We obtain a following upper limits.  

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

   48036 | 2022-04-20 10:05:20 |         MASTER-OAFA | (22h 50m 36.86s , -01d 30m 45.9s) |   C |    60 | 16.1 |        
   48116 | 2022-04-20 10:06:39 |         MASTER-OAFA | (22h 42m 52.53s , +00d 24m 49.7s) |   C |    60 | 16.0 |        
   48198 | 2022-04-20 10:08:02 |         MASTER-OAFA | (22h 50m 52.81s , +00d 23m 25.5s) |   C |    60 | 15.8 |        
   48358 | 2022-04-20 10:10:42 |         MASTER-OAFA | (22h 50m 38.39s , -01d 29m 45.7s) |   C |    60 | 15.5 |        
   95511 | 2022-04-20 23:16:35 |         MASTER-OAFA | (02h 33m 58.57s , -17d 13m 02.1s) |   C |    60 | 15.3 |        
   95591 | 2022-04-20 23:17:55 |         MASTER-OAFA | (02h 42m 16.57s , -17d 13m 43.9s) |   C |    60 | 15.6 |        
Filter C is a clear (unfiltred) band. 


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