TITLE:   GCN CIRCULAR
NUMBER:  31940
SUBJECT: Fermi  trigger No 672374264: Global MASTER-Net observations report 
DATE:    22/04/23 22:30:18 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-Kislovodsk robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the Fermi GRB220423.11 (trigger No 672374264,17h 23m 48.00s , -45d 30m 00.0s, R=26.95) errorbox  66969 sec after notice time and 66999 sec after trigger time at 2022-04-23 21:14:18 UT, with upper limit up to  16.2 mag. The observations began at zenith distance = 79 deg. The sun  altitude  is -34.3 deg. 

The galactic latitude b = -6 deg., longitude l = 344 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1951755

We obtain a following upper limits.  

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

   67029 | 2022-04-23 21:14:18 |   MASTER-Kislovodsk | (16h 30m 51.50s , -28d 59m 49.6s) |   C |    60 | 14.7 |        
   67029 | 2022-04-23 21:14:18 |   MASTER-Kislovodsk | (16h 35m 27.03s , -29d 24m 39.8s) |   C |    60 | 15.3 |        
   67109 | 2022-04-23 21:15:38 |   MASTER-Kislovodsk | (16h 47m 28.56s , -27d 07m 14.6s) |   C |    60 | 14.5 |        
   67109 | 2022-04-23 21:15:38 |   MASTER-Kislovodsk | (16h 51m 59.05s , -27d 32m 05.1s) |   C |    60 | 15.1 |        
   67805 | 2022-04-23 21:27:13 |   MASTER-Kislovodsk | (16h 14m 38.70s , -30d 55m 11.7s) |   C |    60 | 15.4 |        
   67805 | 2022-04-23 21:27:14 |   MASTER-Kislovodsk | (16h 19m 21.54s , -31d 19m 51.8s) |   C |    60 | 15.9 |        
   67885 | 2022-04-23 21:28:33 |   MASTER-Kislovodsk | (15h 58m 48.37s , -32d 47m 27.9s) |   C |    60 | 15.4 |        
   67885 | 2022-04-23 21:28:34 |   MASTER-Kislovodsk | (16h 03m 36.63s , -33d 12m 12.9s) |   C |    60 | 15.9 |        
   67965 | 2022-04-23 21:29:53 |   MASTER-Kislovodsk | (16h 30m 48.27s , -29d 01m 28.1s) |   C |    60 | 15.8 |        
   67965 | 2022-04-23 21:29:53 |   MASTER-Kislovodsk | (16h 35m 25.49s , -29d 26m 11.8s) |   C |    60 | 16.2 |        
   68045 | 2022-04-23 21:31:14 |   MASTER-Kislovodsk | (16h 52m 07.54s , -27d 31m 00.3s) |   C |    60 | 16.1 |        
Filter C is a clear (unfiltred) band. 


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