TITLE:   GCN CIRCULAR
NUMBER:  28817
SUBJECT: Fermi GRB 201031B: Global MASTER-Net observations report 
DATE:    20/10/31 21:30:36 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-IAC robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Spain (IAC Teide Observatory) started inspect of the Fermi GRB 201031B ( Fermi GBM team, GCN 28815) errorbox  9553 sec after notice time and 9640 sec after trigger time at 2020-10-31 20:32:04 UT, with upper limit up to  16.8 mag. The observations began at zenith distance = 53 deg. The sun  altitude  is -29.8 deg. 

The galactic latitude b = -3 deg., longitude l = 141 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1473043

We obtain a following upper limits.  

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

    9670 | 2020-10-31 20:32:04 |          MASTER-IAC | (02h 28m 29.48s , +51d 55m 57.7s) |   C |    60 | 16.8 |        
    9750 | 2020-10-31 20:33:24 |          MASTER-IAC | (02h 41m 30.02s , +51d 57m 11.9s) |   C |    60 | 16.7 |        
   10166 | 2020-10-31 20:40:20 |          MASTER-IAC | (02h 54m 30.92s , +51d 55m 46.5s) |   C |    60 | 16.7 |        
   10257 | 2020-10-31 20:41:51 |          MASTER-IAC | (03h 05m 47.75s , +51d 56m 15.9s) |   C |    60 | 16.7 |        
   10509 | 2020-10-31 20:46:03 |          MASTER-IAC | (02h 41m 34.50s , +51d 56m 15.3s) |   C |    60 | 16.7 |        
   10777 | 2020-10-31 20:50:31 |          MASTER-IAC | (03h 05m 43.26s , +51d 56m 35.1s) |   C |    60 | 16.7 |        
Filter C is a clear (unfiltred) band. 


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