TITLE:   GCN CIRCULAR
NUMBER:  30244
SUBJECT: Fermi  trigger No 645485036: Global MASTER-Net observations report 
DATE:    21/06/16 22:30:16 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-IAC robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Spain (IAC Teide Observatory) started inspect of the Fermi GRB210615.89 (trigger No 645485036,07h 45m 04.80s , +12d 48m 00.0s, R=3.25) errorbox  84879 sec after notice time and 84906 sec after trigger time at 2021-06-16 20:58:58 UT, with upper limit up to  16.9 mag. Observations started at twilight.  The observations began at zenith distance = 79 deg. The sun  altitude  is -11.8 deg. 

The galactic latitude b = 18 deg., longitude l = 208 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1637774

We obtain a following upper limits.  

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

   84937 | 2021-06-16 20:58:58 |          MASTER-IAC | (08h 02m 08.60s , +10d 42m 19.2s) |   C |    60 | 15.4 |        
   85017 | 2021-06-16 21:00:18 |          MASTER-IAC | (08h 05m 20.54s , +12d 35m 23.2s) |   C |    60 | 15.9 |        
   85096 | 2021-06-16 21:01:37 |          MASTER-IAC | (07h 58m 00.45s , +16d 23m 13.2s) |   C |    60 | 15.9 |        
   85826 | 2021-06-16 21:13:47 |          MASTER-IAC | (07h 53m 36.54s , +14d 30m 58.2s) |   C |    60 | 16.4 |        
   85906 | 2021-06-16 21:15:07 |          MASTER-IAC | (08h 02m 06.77s , +10d 41m 29.1s) |   C |    60 | 16.5 |        
   85986 | 2021-06-16 21:16:27 |          MASTER-IAC | (08h 05m 28.03s , +12d 37m 18.2s) |   C |    60 | 16.9 |        
   86066 | 2021-06-16 21:17:47 |          MASTER-IAC | (07h 57m 54.61s , +16d 24m 03.3s) |   C |    60 | 16.7 |        
Filter C is a clear (unfiltred) band. 


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