TITLE:   GCN CIRCULAR
NUMBER:  32505
SUBJECT: Fermi  trigger No 683646997: Global MASTER-Net observations report 
DATE:    22/09/01 00:00:21 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 GRB220831.58 (trigger No 683646997,01h 52m 24.00s , -45d 05m 24.0s, R=7.86) errorbox  349 sec after notice time and 34983 sec after trigger time at 2022-08-31 23:39:36 UT, with upper limit up to  15.8 mag. The observations began at zenith distance = 27 deg. The sun  altitude  is -62.6 deg. 

The galactic latitude b = -68 deg., longitude l = 272 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2074300

We obtain a following upper limits.  

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

   35014 | 2022-08-31 23:39:36 |         MASTER-SAAO | (01h 40m 09.68s , -44d 38m 08.0s) |   C |    60 | 15.8 |        
   35093 | 2022-08-31 23:40:56 |         MASTER-SAAO | (01h 51m 30.21s , -44d 38m 04.1s) |   C |    60 | 14.9 |        
   35185 | 2022-08-31 23:42:28 |         MASTER-SAAO | (01h 43m 43.63s , -46d 31m 42.7s) |   C |    60 | 13.0 |        
Filter C is a clear (unfiltred) band. 


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