[vsnet-grb-info 28501] Fermi trigger No 650046564: Global MASTER-Net observations report

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  30604
SUBJECT: Fermi  trigger No 650046564: Global MASTER-Net observations report 
DATE:    21/08/07 17:15:55 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov at 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 GRB210807.69 (trigger No 650046564,18h 15m 55.92s , -28d 55m 58.8s, R=7.8) errorbox  704 sec after notice time and 731 sec after trigger time at 2021-08-07 16:41:31 UT, with upper limit up to  17.2 mag. Observations started at twilight.  The observations began at zenith distance = 39 deg. The sun  altitude  is -7.9 deg. 

The galactic latitude b = -6 deg., longitude l =  4 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1683557

We obtain a following upper limits.  

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

     762 | 2021-08-07 16:41:31 |         MASTER-SAAO | (18h 11m 32.65s , -29d 18m 46.7s) |   C |    60 | 15.3 |        
     841 | 2021-08-07 16:42:50 |         MASTER-SAAO | (18h 20m 37.09s , -29d 20m 03.6s) |   C |    60 | 16.3 |        
     921 | 2021-08-07 16:44:10 |         MASTER-SAAO | (18h 09m 20.02s , -27d 23m 54.4s) |   C |    60 | 16.1 |        
    1001 | 2021-08-07 16:45:30 |         MASTER-SAAO | (18h 18m 20.39s , -27d 25m 32.3s) |   C |    60 | 17.2 |        
    1080 | 2021-08-07 16:46:49 |         MASTER-SAAO | (18h 14m 56.64s , -31d 12m 50.9s) |   C |    60 | 16.3 |        
    1160 | 2021-08-07 16:48:09 |         MASTER-SAAO | (18h 24m 17.55s , -31d 12m 08.4s) |   C |    60 | 17.0 |        
    1240 | 2021-08-07 16:49:29 |         MASTER-SAAO | (18h 08m 21.49s , -25d 31m 38.1s) |   C |    60 | 16.0 |        
Filter C is a clear (unfiltred) band. 


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