TITLE:   GCN CIRCULAR
NUMBER:  30371
SUBJECT: Fermi  trigger No 647108723: Global MASTER-Net observations report 
DATE:    21/07/05 04:32:39 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-OAFA robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Argentina (OAFA observatory of San Juan National University) started inspect of the Fermi GRB210704.68 (trigger No 647108723,13h 33m 45.60s , -41d 52m 12.0s, R=1) errorbox 40628 sec after trigger time at 2021-07-05 03:42:27 UT, with upper limit up to  18.4 mag. The observations began at zenith distance = 54 deg. The sun  altitude  is -74.9 deg. 

The galactic latitude b = 20 deg., longitude l = 312 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1652710

We obtain a following upper limits.  

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

   40719 | 2021-07-05 03:42:27 |         MASTER-OAFA | (13h 29m 19.35s , -42d 26m 07.3s) |   C |   180 | 18.4 |        
   41541 | 2021-07-05 03:56:09 |         MASTER-OAFA | (13h 29m 27.44s , -41d 05m 11.0s) |   C |   180 | 18.3 |        
   41680 | 2021-07-05 03:59:28 |         MASTER-OAFA | (13h 31m 10.74s , -39d 48m 57.3s) |   C |    60 | 18.3 |        
   42168 | 2021-07-05 04:07:36 |         MASTER-OAFA | (13h 41m 39.33s , -39d 47m 17.4s) |   C |    60 | 18.4 |        
   42327 | 2021-07-05 04:10:15 |         MASTER-OAFA | (13h 25m 10.35s , -41d 42m 33.8s) |   C |    60 | 18.2 |        
   42407 | 2021-07-05 04:11:35 |         MASTER-OAFA | (13h 34m 51.88s , -41d 43m 05.1s) |   C |    60 | 18.3 |        
   42486 | 2021-07-05 04:12:55 |         MASTER-OAFA | (13h 45m 45.39s , -41d 41m 26.0s) |   C |    60 | 18.4 |        
   42646 | 2021-07-05 04:15:34 |         MASTER-OAFA | (13h 29m 42.47s , -43d 36m 01.5s) |   C |    60 | 18.1 |        
   42725 | 2021-07-05 04:16:54 |         MASTER-OAFA | (13h 31m 06.00s , -39d 49m 10.1s) |   C |    60 | 18.1 |        
Filter C is a clear (unfiltred) band. 


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