TITLE:   GCN CIRCULAR
NUMBER:  30948
SUBJECT: Fermi  trigger No 656268212: Global MASTER-Net observations report 
DATE:    21/10/20 00:15:22 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),

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-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 GRB211018.70 (trigger No 656268212,09h 14m 40.80s , -21d 34m 12.0s, R=2.81) errorbox  70341 sec after notice time and 1 days 25714 sec after trigger time at 2021-10-19 23:52:01 UT, with upper limit up to  16.8 mag. The observations began at zenith distance = 77 deg. The sun  altitude  is -42.8 deg. 

The galactic latitude b = 19 deg., longitude l = 251 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1756594

We obtain a following upper limits.  

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

  112144 | 2021-10-19 23:52:01 |         MASTER-SAAO | (09h 02m 51.87s , -23d 31m 10.8s) |   C |    60 | 13.4 |        
  113172 | 2021-10-20 00:09:09 |         MASTER-SAAO | (09h 02m 50.96s , -23d 29m 21.5s) |   C |    60 | 16.8 |        
Filter C is a clear (unfiltred) band. 


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