[vsnet-grb-info 28587] Fermi trigger No 651306769: Global MASTER-Net observations report

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  30690
SUBJECT: Fermi  trigger No 651306769: Global MASTER-Net observations report 
DATE:    21/08/23 01:15:16 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 GRB210822.27 (trigger No 651306769,22h 53m 48.00s , -46d 18m 00.0s, R=2.08) errorbox  44653 sec after notice time and 65943 sec after trigger time at 2021-08-23 00:51:47 UT, with upper limit up to  17.9 mag. The observations began at zenith distance = 21 deg. The sun  altitude  is -53.7 deg. 

The galactic latitude b = -60 deg., longitude l = 345 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1697119

We obtain a following upper limits.  

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

   65973 | 2021-08-23 00:51:47 |         MASTER-SAAO | (23h 04m 07.16s , -48d 22m 25.3s) |   C |    60 | 17.9 |        
   66954 | 2021-08-23 01:08:08 |         MASTER-SAAO | (23h 04m 08.51s , -48d 23m 38.3s) |   C |    60 | 17.9 |        
Filter C is a clear (unfiltred) band. 


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