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GCN Circular 30940

Subject
Fermi trigger No 656288898: Global MASTER-Net observations report
Date
2021-10-18T22:45:17Z (3 years ago)
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 GRB211018.94 (trigger No 656288898,01h 02m 31.20s , -00d 40m 48.0s, R=1.23) errorbox  57 sec after notice time and 87 sec after trigger time at 2021-10-18 22:29:41 UT, with upper limit up to  16.4 mag. The observations began at zenith distance = 32 deg. The sun  altitude  is -48.1 deg. 

The galactic latitude b = -63 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=1756363

We obtain a following upper limits.  

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

      97 | 2021-10-18 22:29:41 |         MASTER-SAAO | (01h 02m 32.62s , -00d 53m 28.3s) |   C |    20 | 15.8 |        
     122 | 2021-10-18 22:29:41 |         MASTER-SAAO | (01h 02m 32.62s , -00d 53m 28.3s) |   C |    70 | 16.4 |  Coadd 
     137 | 2021-10-18 22:30:20 |         MASTER-SAAO | (01h 02m 38.46s , -00d 53m 07.0s) |   C |    20 | 15.9 |        
     181 | 2021-10-18 22:31:00 |         MASTER-SAAO | (01h 02m 35.96s , -00d 51m 51.5s) |   C |    30 | 16.0 |        
Filter C is a clear (unfiltred) band. 


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