TITLE:   GCN CIRCULAR
NUMBER:  30408
SUBJECT: Fermi  trigger No 647271699: Global MASTER-Net observations report 
DATE:    21/07/07 16:46:02 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 GRB210706.57 (trigger No 647271699,07h 35m 48.00s , -49d 08m 24.0s, R=1.32) errorbox  63495 sec after notice time and 1 days 10108 sec after trigger time at 2021-07-07 16:30:02 UT, with upper limit up to  17.1 mag. Observations started at twilight.  The observations began at zenith distance = 60 deg. The sun  altitude  is -9.0 deg. 

The galactic latitude b = -13 deg., longitude l = 262 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1654728

We obtain a following upper limits.  

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

   96539 | 2021-07-07 16:30:02 |         MASTER-SAAO | (07h 31m 04.16s , -51d 52m 25.2s) |   C |    60 | 16.4 |        
   96618 | 2021-07-07 16:31:22 |         MASTER-SAAO | (07h 42m 45.95s , -51d 54m 20.5s) |   C |    60 | 16.4 |        
   96778 | 2021-07-07 16:34:02 |         MASTER-SAAO | (07h 47m 52.76s , -49d 59m 47.3s) |   C |    60 | 16.8 |        
   97018 | 2021-07-07 16:38:01 |         MASTER-SAAO | (07h 19m 29.69s , -48d 05m 17.4s) |   C |    60 | 17.1 |        
Filter C is a clear (unfiltred) band. 


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