TITLE:   GCN CIRCULAR
NUMBER:  28430
SUBJECT: Fermi  trigger No 621893860: Global MASTER-Net observations report 
DATE:    20/09/16 15:31:07 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 GRB200915.85 (trigger No 621893860,10h 15m 00.00s , +25d 08m 24.0s, R=59.02) errorbox  24216 sec after notice time and 24248 sec after trigger time at 2020-09-16 03:01:43 UT, with upper limit up to  18.2 mag. The observations began at zenith distance = 68 deg. The sun  altitude  is -20.8 deg. 

The galactic latitude b = 56 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=1442250

We obtain a following upper limits.  

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

   24339 | 2020-09-16 03:01:43 |         MASTER-SAAO | (08h 30m 07.24s , -03d 57m 39.6s) |   B |   180 | 18.2 |        
   24339 | 2020-09-16 03:01:43 |         MASTER-SAAO | (08h 30m 58.49s , -03d 57m 44.5s) |   V |   180 | 17.3 |        
   24538 | 2020-09-16 03:05:03 |         MASTER-SAAO | (08h 30m 11.23s , -03d 57m 26.0s) |   C |   180 | 17.8 |        
   24538 | 2020-09-16 03:05:03 |         MASTER-SAAO | (08h 31m 02.42s , -03d 57m 31.1s) |   C |   180 | 18.2 |        
   25310 | 2020-09-16 03:17:54 |         MASTER-SAAO | (08h 30m 07.20s , -03d 57m 43.0s) |   B |   180 | 17.0 |        
   25310 | 2020-09-16 03:17:54 |         MASTER-SAAO | (08h 31m 02.17s , -03d 57m 38.2s) |   V |   180 | 16.7 |        
   25509 | 2020-09-16 03:21:14 |         MASTER-SAAO | (08h 30m 03.34s , -03d 56m 07.5s) |   C |   180 | 16.8 |        
   25509 | 2020-09-16 03:21:14 |         MASTER-SAAO | (08h 30m 58.35s , -03d 56m 16.8s) |   C |   180 | 17.4 |        
Filter C is a clear (unfiltred) band. 


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